Alpha Inflation? The Impact of Eliminating Scale Items on Cronbach's Alpha

1997 ◽  
Vol 70 (3) ◽  
pp. 189-197 ◽  
Author(s):  
Praveen K. Kopalle ◽  
Donald R. Lehmann
Keyword(s):  
Cronbach’S Alpha ◽  
Cronbach's Alpha ◽  
The Impact

scholarly journals Instrumen Pengukuran Kualitas Hidup Anak Terinfeksi HIV

2011 ◽  
Vol 6 (3) ◽  
pp. 126
Author(s):  
Toha Muhaimin ◽  
Budi Utomo ◽  
Dharmayati B. Utoyo ◽  
Nia Kurniati ◽  
Triyanti Anugrahini ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Measurement Instrument ◽  
Immune Deficiency Syndrome ◽  
Deficiency Syndrome ◽  
Cronbach’S Alpha ◽  
Cronbach's Alpha ◽  
Special Instrument ◽  
The Impact ◽  
Hiv Aids

Anak penderita Human Immunodeficiency Virus/Acquired Immune Deficiency Syndrome (HIV/AIDS) di Indonesia memperlihatkan tren yang semakin meningkat karena meningkatnya proporsi perempuan terinfeksi HIV/AIDS. Pertimbangan pada dampak besar yang dihadapi anak penderita HIV mendorong kebutuhan pengembangan instrumen khusus untuk mengukur kualitas hidup mereka. Penelitian ini bertujuan mengembangkan instrumen kualitas hidup anak penderita AIDS dengan memodifikasi instrumenyang ada sesuai dengan konteks Indonesia. Pada penelitian ini ditemukan hasil bahwa instrumen yang dikembangkan mempunyai reliabilitas yang cukup baik pada balita dan anak usia 5 – 11 tahun. Nilai reliabilitas (Cronbach’s Alpha) balita, domain fungsi fisik, fungsi sosial, dan gejala HIV masing masing adalah 0,71; 0,72; dan 0,88, sedangkan pada anak 5 – 11 tahun, domain fungsi-fungsi fisik, psikologis, sosial, sekolah, dan gejala terkait HIV masing-masing 0,76; 0,89; 0,67; 0,67; dan 0,88. Penelitian ini menunjukkan untuk konteks Indonesia, nilai ambang batas CD4 yang menunjukkan perbedaan kualitas hidup adalah 15%. Pada balita, dari berbagai ketiga domain, hanya domain gejala terkait HIV yang cukup sensitif untuk mendeteksi perbedaan kualitas hidup anak, sementara pada anak 5 – 11 hanya domain fungsi fisik dan fungsi psikologis yang cukup sensitif untuk mendeteksi perbedaan kualitas hidup anak. Penelitian ini menunjukkan bahwa dampak HIV pada anak masih terkonsentrasi pada gangguan fungsi fisik, fungsi psikologis, dan gejala terkait HIV.Kata kunci: Instrumen pengukuran, anak terinfeksi HIV, kualitas hidupAbstractChildren with HIV/AIDS in Indonesia are increasing due to the increase of woman with HIV. A special instrument for measuring quality of life (QoL) of children with HIV is needed to be developed as the great impact of the infection to children. This study was conducted by modifying the existing QoL instrument of children for Indonesian context. The study indicated that thereliability of the instrument is quite good both for children under 5 and 5 – 11 years old. Reliability values (Cronbach’s Alpha) for under 5, domains of physical function, social function, and HIV-related symptoms are 71, 72, and 88 respectively while for children 5 – 11 years old, domains of physical, psychological, social, and school functions, and HIV-related symptoms are 76, 89, 67, 67, and 88 respectively. The study showed, for Indonesian context, 15% of CD4 is indicated as the threshold to detect the difference of QoL forchildren with HIV. However, for under 5 years old, only questions of HIV-related symptoms domain which is sensitive to detect difference QoL, whereas for children of 5 – 11 years old, the questions concerning physical and psychological domains which are sensitive to detect difference QoL. The study indicated that the impact of HIV on children is mostly on physical andpsychological functions and HIV-related symptoms.Key words: Measurement instrument, children with HIV, quality of life

scholarly journals Determinants Influencing Performance of Accountants: The Case of Vietnam

2018 ◽  
Vol 10 (7) ◽  
pp. 1
Author(s):  
Duc Tai Do ◽  
Duc Dinh Truong ◽  
Manh Dung Tran ◽  
Thi Ngoc Lan Nguyen
Keyword(s):  
Job Satisfaction ◽  
Regression Model ◽  
Positive Relationships ◽  
Cronbach’S Alpha ◽  
Cronbach's Alpha ◽  
Doing Business ◽  
Independent Variable ◽  
The Impact

This study is conducted to investigate the impact levels of determinants on performance of accountants in enterprises in Vietnam. Data were collected from getting 205 questionnaires from firms doing businesses in Vietnam. Based on the data collected, we use Cronbach’s Alpha, EFA and run regression model for knowing the impact levels of each independent variable on dependent variable of accountant performance. The results show that four determinants including accounting framework (PL), job satisfaction (HL), supports from firms (HT), confidence of accountants (ST) have positive relationships with accountant performance. Based on the findings, some recommendations are given for improving accountant performances of firms doing business in the context of Vietnam.

scholarly journals The impact of personality traits on attitudes toward learning communication skills

2020 ◽  
Vol 30 (1) ◽  
pp. e37326
Author(s):  
Camila Ament Giuliani dos Santos Franco ◽  
Renato Soleiman Franco ◽  
Dario Cecilio-Fernandes ◽  
Milton Severo ◽  
Maria Amélia Ferreira
Keyword(s):  
Personality Traits ◽  
Communication Skills ◽  
Attitude Scale ◽  
Openness To Experience ◽  
Personality Factors ◽  
Undergraduate Medical Students ◽  
Cronbach’S Alpha ◽  
Cronbach's Alpha ◽  
Attitudes Toward Learning ◽  
The Impact

Aims: The aim of this study was to investigate the association between personality traits and attitudes toward learning communication skills in undergraduate medical students. The relation between students’ attitudes and personality trait could help us identify those who those who will need more support to develop communication skills, based on their personality traits.Methods: The data was collected data from an intentional and cross-sectional sample composed of 204 students from three Brazilian universities. The students answered questionnaires containing the Communication Skills Attitude Scale (CSAS-BR) and the Big Five Mini-Markers (BFMM) for personality. Data were analyzed using frequency calculations, principal components analysis, and the multiple linear regression model.Results: Seven among 26 items of the original Communication Skills Attitude Scale (CSAS) presented factor loads lower than |0.30| and must be excluded in the CSAS -BR that showed one domain including positive and negative attitudes. The value of Cronbach’s alpha of the 19-item scale was 0.894. The BFMM showed similar dimensional results with five domains with Cronbach’s alpha values of 0.804 for Extroversion, 0.753 for agreeableness, 0.755 for conscientiousness, 0.780 for neuroticism and 0.668 for openness. There were positive and statically significant linear associations with the CSAS-BR and agreeableness (β: 0.230, p<0.001), extraversion (β: 0.150, p=0.030), and openness to experience (β: 0.190, p=0.010). These personality factors drive social interactions and interpersonal relations, which involve the tendency to be friendly, flexible, and cooperative; to show a willing disposition; and the ability to actively engage with others. Conclusions: Based on the methods applied in this study, the results demonstrated a relation between agreeableness, extraversion and openness to experience with attitudes on communication skills in students from three Brazilian universities. Our results suggest that the evaluation of personality traits can contribute to the recognition of students for whom the establishment of special teaching strategies can improve communication skills.

scholarly journals The Role of Education in the Formation of Tax Ethics in Azerbaijan

2021 ◽  
Vol 12 (6) ◽  
pp. 1857-1868
Author(s):  
Mubariz Mammadli, Zivar Zeynalova
Keyword(s):  
Public Administration ◽  
Empirical Research ◽  
Questionnaire Survey ◽  
Cronbach’S Alpha ◽  
Cronbach's Alpha ◽  
Paired Samples ◽  
The Republic ◽  
The Impact

This paper discusses the importance of tax ethics, as well as the impact of education on it. The impact of tax-oriented education on tax ethics was determined in the case of Azerbaijan. For this purpose, it was applied a questionnaire survey to 250 students studied at the Academy of Public Administration under the President of the Republic of Azerbaijan between 2017 and 2019 years. The collected data were analyzed descriptively, and the hypothesis was tested using the Paired Samples Test. Cronbach's Alpha conducted to verify the validity of the research. Analyzes and tests were carried out electronically using the SPSS 16.0 software. As a result of empirical research, it turned out that the attitude towards taxation was higher after passing tax classes.

scholarly journals French Adaptation of the Activity Impairment Assessment Score in Order to Assess the Activity Impairment of Women Presenting with Acute Uncomplicated Cystitis in Primary Care: Translation and Psychometric Validation.

2020 ◽  
Author(s):  
Yves-Marie VINCENT ◽  
Mélanie Duhart ◽  
Alain Chen Yen Su ◽  
Jean-Arthur Micoulau-Franchi ◽  
Guillaume Conort
Keyword(s):  
Primary Care ◽  
Daily Activities ◽  
Psychometric Validation ◽  
Cronbach’S Alpha ◽  
Activity Impairment ◽  
Acute Cystitis ◽  
Multicentric Study ◽  
French Version ◽  
Cronbach's Alpha ◽  
The Impact

Abstract PurposeThe Activity Impairment Assessment (AIA) is a 5 items questionnaire exploring the impact of acute cystitis on daily activities. It’s a self-administrated tool easy to use in primary care studies. The purpose of this study is to translate and validate a French version of the AIA: the AIA-fr.MethodsWe use a forward-backward translation before to analyze the psychometric properties of the French version. We proceeded to a quantitative, prospective, observational multicentric study. King Health Questionnaire and Ditrovie scale were used to determine convergent and divergent validity. Following an inclusion visit, each file was completed by the patient on day 0, 3 and 5.ResultsFifty-two files were received by the investigator of which two empty files. In the end, 50 files were included in the study. There was a 100% response rate for the AIA-fr on days 0, 3 and 5. Cronbach’s alpha was calculated at 0.87 with a 95% confidence interval between 0.78 and 0.92. We found that this coefficient was not improved by removing one of the items (Cronbach’s alpha 0.81–0.87). There is a negative correlation (p = 0.01 Rs = − 0.35) between the total AIA-fr score and the number of days between symptom onset and consultation (day 0). This implies that the higher the AIA-fr score the sooner women will seek medical care.ConclusionsThe French version of the AIA is a psychometrically acceptable self-report questionnaire for measuring the impact of acute cystitis on daily activities. It’s the first French tool evaluating this impact.

scholarly journals Validation of the St George’s respiratory questionnaire Vietnamese Version in new pulmonary tuberculosis patients

2020 ◽  
Author(s):  
Han Nguyen ◽  
Khan Mai Xuan ◽  
Tuan Nguyen Chi ◽  
Tung Nguyen Thanh ◽  
Quyet Do
Keyword(s):  
Pulmonary Tuberculosis ◽  
Military Hospital ◽  
Ethical Review ◽  
Cronbach’S Alpha ◽  
Tuberculosis Patients ◽  
Cronbach's Alpha ◽  
Case Series Study ◽  
St George's Respiratory Questionnaire ◽  
The Impact

Abstract Background: According to the Global Tuberculosis Report 2019, Vietnam is one of the 20 countries with the highest TB prevalence in the world. Pulmonary tuberculosis has a significant effect on lung functions, causing many obstacles in daily activities and affects the quality of patient’s lives.Methods: The case-series study conducted on 43 newly-diagnosed pulmonary tuberculosis patients at the Department of Tuberculosis - Military Hospital 103 within 4 months. The aims of the current study were to evaluate the validity of the Vietnamese version of the St. George's Respiratory Questionnaire and to investigate the relationship between SGRQ scores and the clinical and subclinical symptoms in new pulmonary tuberculosis patients.Results: The results indicate that Vietnamese version of the SGRQ has high reliability with Cronbach's alpha of Total score was 0.9451, Cronbach's alpha of all domains was above 0.6, of which the Symptom domain was 0.6635, the Impact domain was 0.9069, the Activity domain was 0.9121. The study also showed that SGRQ score was proportional to the aggregate size of all cavities on chest X-ray (r = 0.3772) and inversely proportional to BMI (r = -0.2843), MGIT days to positivity (r = -0.1635).Conclusions: The Vietnamese version of the SGRQ is a highly reliable and valuable questionnaire in assessing symptoms and life effects in new PTB patients. We recommend it as symptom measurement and quality of life evaluation in patients with new PTB in future studies.Trial registration: The study protocol was approved by the Ethical Review Board Committee of Vietnam Military Medical University (IRB No. 250/2020/QĐ-HVQY) and by the local ethics committee of Military hospital 103. All participants had provided written informed consents for this study.

scholarly journals Development and validation of an instrument to evaluate medical students' lifestyle

Medwave ◽  
2021 ◽  
Vol 21 (07) ◽  
pp. e8434-e8434
Author(s):  
Jhony de la Cruz Vargas ◽  
Daniel Orejón ◽  
Luis Roldan ◽  
Lucy Correa-López ◽  
Alonso Soto
Keyword(s):  
Factor Analysis ◽  
Medical Students ◽  
Construct Validity ◽  
Health Science ◽  
Validity And Reliability ◽  
Cronbach’S Alpha ◽  
Cronbach's Alpha ◽  
Sphericity Test ◽  
Final Questionnaire ◽  
The Impact

Introduction It is required to have validated instruments in health science students that identify unhealthy habits and assess the impact of educational interventions and programs aimed at promoting a healthy lifestyle. Objective To evaluate the validity and reliability of an instrument to measure medical students' lifestyles. Methods A lifestyle questionnaire was developed using the Delphi technique by a group of experts. The final questionnaire was applied to 332 students of the School of Medicine of the Ricardo Palma University in 2017. A preliminary examination was carried out to assess preconditions for construct validity—including the correlation matrix, the Kaiser Meyer Olkin statistic, and the Bartlett sphericity test. Factor analysis was used for construct validity, and the possible resulting factors were extracted through the principal component analysis. Cronbach's alpha coefficient was calculated to assess the instrument reliability. Results In this study, 41.6% of participants were men with a mean age of 20 years (standard deviation = 3). The preconditions for the factor analysis were a Kaiser Meyer Olkin coefficient = 0.773 and a significant Bartlett sphericity test. For the 47 items of the final questionnaire, the factor analysis showed an explained variance of 56.7% with eigenvalues greater than one. Cronbach's alpha was 0.78. The final questionnaire could assume values between -23 to 151 points. Based on a cut point of 71 points, the prevalence of students with an unhealthy lifestyle was 73.6%. Conclusion The developed instrument has acceptable validity and reliability to measure lifestyle in medical students. For external validation, studies in other university populations are suggested.

scholarly journals Los tamaños de las muestras en encuestas de las ciencias sociales y su repercusión en la generación del conocimiento

2017 ◽  
Vol 11 (22) ◽  
Author(s):  
Juan Rositas Martínez
Keyword(s):  
Factor Analysis ◽  
Sample Size ◽  
Confidence Intervals ◽  
Structural Equation ◽  
Size Factor ◽  
Sample Sizes ◽  
Cronbach’S Alpha ◽  
Cronbach's Alpha ◽  
Alpha Effect ◽  
The Impact

Keywords: confidence intervals, Cronbach's alpha, effect size, factor analysis, hypothesis testing, sample size, structural equation modelingAbstract. The purpose of this paper is to contribute to fulfilling the objectives of social sciences research such as proper estimation, explanation, prediction and control of levels of social reality variables and their interrelationships, especially when dealing with quantitative variables. It was shown that the sample size or the number of observations to be collected and analyzed is transcendental for the adequacy of the method of statistical inference selected and for the impact degree achieved in its results, especially for complying with reports guidelines issued by the American Psychological Association. Methods and formulations were investigated to determine the sample sizes that contribute to have good levels of estimation when establishing confidence intervals, with reasonable wide and relevant and significative magnitudes of the effects. Practical rules suggested by several researchers when determining samples sizes were tested and as a result it was integrated a guide for determining sample sizes for dichotomous, continuous, discrete and Likert variables, correlation and regression methods, factor analysis, Cronbach's alpha, and structural equation models. It is recommended that the reader builds scenarios with this guide and be aware of the implications and relevance in scientific research and decision making of the sample sizes in trying to meet the aforementioned objectives.Palabras clave: análisis factorial, intervalo de confianza, alpha de Cronbach, modelación mediante ecuaciones estructurales, pruebas de hipótesis, tamaño de muestra, tamaño del efectoResumen. El propósito del presente documento es contribuir al cumplimiento de los objetivos de la investigación en las ciencias sociales de estimar, explicar, predecir y controlar niveles de variables de la realidad social y sus interrelaciones, en investigaciones de tipo cuantitativo. Se demostró que el tamaño de la muestra o la cantidad de observaciones que hay que recolectar y analizar es trascendente tanto en la pertinencia del método de inferencia estadístico que se utilice como en el grado de impacto que se logre en sus resultados, sobre todo de cara a cumplir con lineamientos emitidos por la Asociación Americana de Psicología que es la que da la pauta en la mayoría de las publicaciones del área social. Se investigaron métodos y formulaciones para determinar los tamaños de muestra que contribuyan a tener buenos niveles de estimación al momento de establecer los intervalos de confianza, con aperturas razonables y con magnitudes de los efectos que sean de impacto y se pusieron a prueba reglas prácticas sugeridas por varios autores lográndose integrar una guía tanto para variables dicotómicas, continuas, discretas, tipo Likert y para interrelaciones en ellas, ya se trate de análisis factorial, alpha de Cronbach, regresiones o ecuaciones estructurales. Se recomienda que el lector crear escenarios con esta guía y se sensibilice y se convenza de las implicaciones y de trascendencia tanto en la investigación científica como en la toma de decisiones de los tamaños de muestra al tratar de cumplir con los objetivos de la que hemos mencionado.

scholarly journals A pilot survey on the quality of life in respiratory rehabilitation carried out in COPD patients with severe respiratory failure: preliminary data of a novel Inpatient Respiratory Rehabilitation Questionnaire (IRRQ)

2012 ◽  
Vol 7 ◽  
Author(s):  
Franco Pasqua ◽  
Annalisa Alesii ◽  
Katja Geraneo ◽  
Stefania Di Toro ◽  
Giuseppe La Torre ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Pulmonary Rehabilitation ◽  
Wilcoxon Test ◽  
Cronbach’S Alpha ◽  
Cronbach's Alpha ◽  
Copd Patients ◽  
The Impact ◽  
Respiratory Rehabilitation ◽  
Non Parametric

Background: Measuring the state of health is a method for quantifying the impact of an illness on the day-to-day life, health and wellbeing of a patient, providing a quantitative measure of an individual’s quality of life (QoL). QoL expresses patient point of view by a subjective dimension and can express the results of medical intervention. Pulmonary rehabilitation is an essential component in the management of COPD patients, and measuring QoL has become a central focus in the study of this disease. Although nowadays several questionnaires for measuring the QoL in COPD patients are available, there are no questionnaires specifically developed for evaluating QoL in COPD patients undergoing respiratory rehabilitation. The aim of this study was to develop a novel questionnaire for the QoL quantification in COPD patients undergoing in-patient pulmonary rehabilitation program. Methods: The questionnaire, administered to COPD patients undergoing long-term oxygen therapy into a respiratory rehabilitation ward, was developed by a simple and graphic layout to be administered to elderly patients. It included one form for admission and another for discharge. It included only tips related to the subjective components of QoL that would be relevant for patient, although likely not strictly related to the respiratory function. A descriptive analysis was performed for the socio-demographic characteristics and both the non-parametric Wilcoxon T-test and the Cronbach’s alpha index were calculated for evaluating the sensitivity of the questionnaire to the effects of respiratory rehabilitation and for identifying its consistency. Results: The physical and psychological condition of the 34 COPD patients improved after the rehabilitative treatment and this finding was detected by the questionnaire (overall improvement: 14.2±2.5%), as confirmed by the non-parametric Wilcoxon test (p<0.01). The consistency detected by the Cronbach’s alpha was good for both the questionnaire at admission and at discharge (0.789±0.084 and 0.784±0.145, respectively), although some items did not adequately measure the intended outcome. Conclusions: This proposed questionnaire represents a substantial innovation compared to previous methods for evaluating the QoL, since it has been specifically designed for hospitalized COPD patients undergoing respiratory rehabilitation with serious respiratory deficiency, allowing to effectively determining the QoL in these patients.

scholarly journals Psychometric Properties of the Impact of Events Scale-Revised (IES-R) Among General Iranian Population During the COVID-19 Pandemic

2021 ◽  
Vol 12 ◽  
Author(s):  
Hamid Sharif Nia ◽  
Harpaljit Kaur ◽  
Fatemeh Khoshnavay Fomani ◽  
Pardis Rahmatpour ◽  
Omolhoda Kaveh ◽  
...  
Keyword(s):  
Factor Analysis ◽  
General Population ◽  
Convergent Validity ◽  
Goodness Of Fit ◽  
Validity And Reliability ◽  
Cronbach’S Alpha ◽  
Cronbach's Alpha ◽  
Persian Version ◽  
Impact Of Events Scale ◽  
The Impact

Objective: The aim of this study was to translate and evaluate the validity and reliability of the Impact of Events Scale-Revised (IES-R) among the Iranian general population during the coronavirus disease 2019 (COVID-19) pandemic.Method: This study was methodological cross-sectional. It was conducted on an Iranian public population from April to July 2020 which was during the COVID-19 pandemic. Construct validity was determined through exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) with a total of 500 adults recruited via online data gathering. Reliability was checked through the average inter-item correlation (AIC), Cronbach's alpha, and McDonald's omega. Convergent and divergent validity was determined using Fornell and Larcker's approach.Results: The results showed that the Persian version of IES-R had three factors, including intrusion (six items), avoidance (seven items), and hyperarousal (five items), that explained 59.22% of the total variance of the IES-R. The CFA findings indicated that all goodness-of-fit indices confirmed the model fit. The Cronbach's alpha, McDonald's omega, composite reliability (CR), and maximal reliability were excellent, and the three factors have good convergent validity.Conclusion: The findings of this study indicated that the Persian version of the IES-R scale is efficient and useful to assess post-traumatic stress disorder among Iran general population in the COVID-19 outbreak.

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