Changes in Walleye (Stizostedion vitreum vitreum) Population in Rainy Lake and Factors in Abundance, 1924–75

1977 ◽  
Vol 34 (10) ◽  
pp. 1696-1702 ◽  
Author(s):  
J. R. Chevalier
Keyword(s):  
Growth Rate ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Water Levels ◽  
Stizostedion Vitreum ◽  
Brood Stock ◽  
Commercial Catch ◽  
Compensatory Response ◽  
The Mean ◽  
Significant Factors

Annual commercial harvests of walleye (Stizostedion vitreum vitreum) from Rainy Lake steadily declined from 150,000 kg in the 1920s to 19,000 in the early 1970s; total (all species) harvests averaged 374,000 kg from 1924 to 1975, 45% greater than the MEI estimated allowable harvest. The walleye catch per unit of effort from commercial 102 mm gill nets declined from 43.63 kg/km in 1948 to 18.43 in 1969. Growth rate of walleye increased from 1959 to 1965, probably as a compensatory response to decreased abundance. The increased growth rate, in conjunction with heavy exploitation, caused the mean age of the walleye commercial catch to decline from 1957 to 1967. Both spring water levels and brood stock abundance were significant factors in walleye abundance 5 yr later. From multiple linear regression analysis, these two variables accounted for 65% of the variation in commercial walleye CUE. Key words: Percidae, Stizostedion, walleye, population dynamics, abundance, yield, exploitation, water level, Rainy Lake, Ontario–Minnesota

scholarly journals The impact of emphysema on dosimetric parameters for stereotactic body radiotherapy of the lung

2016 ◽  
Vol 57 (5) ◽  
pp. 555-566 ◽  
Author(s):  
Satoru Ochiai ◽  
Yoshihito Nomoto ◽  
Yasufumi Yamashita ◽  
Tomoki Inoue ◽  
Shuuichi Murashima ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Multiple Linear Regression ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Conformity Index ◽  
Severe Emphysema ◽  
The Mean ◽  
The Impact ◽  
Significant Factors

Abstract The purpose of this study was to evaluate the impact of emphysematous changes in lung on dosimetric parameters in stereotactic body radiation therapy (SBRT) for lung tumor. A total of 72 treatment plans were reviewed, and dosimetric factors [including homogeneity index (HI) and conformity index (CI)] were evaluated. Emphysematous changes in lung were observed in 43 patients (60%). Patients were divided into three groups according to the severity of emphysema: no emphysema ( n = 29), mild emphysema ( n = 22) and moderate to severe emphysema groups ( n = 21). The HI ( P < 0.001) and the CI ( P = 0.029) were significantly different in accordance with the severity of emphysema in one-way analysis of variance (ANOVA). The HI value was significantly higher in the moderate to severe emphysema group compared with in the no emphysema (Tukey, P < 0.001) and mild emphysema groups ( P = 0.002). The CI value was significantly higher in the moderate to severe emphysema group compared with in the no emphysema group ( P = 0.044). In multiple linear regression analysis, the severity of emphysema ( P < 0.001) and the mean material density of the lung within the PTV ( P < 0.001) were significant factors for HI, and the mean density of the lung within the PTV ( P = 0.005) was the only significant factor for CI. The mean density of the lung within the PTV was significantly different in accordance with the severity of emphysema (one-way ANOVA, P = 0.008) and the severity of emphysema ( P < 0.001) was one of the significant factors for the density of the lung within the PTV in multiple linear regression analysis. Our results suggest that emphysematous changes in the lung significantly impact on several dosimetric parameters in SBRT, and they should be carefully evaluated before treatment planning.

scholarly journals Proximate Factors Determining Age and Mass at Fledging in Rhinoceros Auklets (Cerorhinca Monocerata): Intra- and Interyear Variations

The Auk ◽  
2004 ◽  
Vol 121 (2) ◽  
pp. 452-462 ◽  
Author(s):  
Tomohiro Deguchi ◽  
Akinori Takahashi ◽  
Yutaka Watanuki
Keyword(s):  
Growth Rate ◽  
Wing Length ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Major Effect ◽  
Timing Of Breeding ◽  
Hatching Date ◽  
Cerorhinca Monocerata ◽  
Parental Provisioning ◽  
Underlying Mechanisms

Abstract In alcids, growth rate and hatching date of chicks appear to affect fledging age and mass. Underlying mechanisms are hypothesized to be (1) critical wing length at fledging for postfledging survival, (2) synchronization of fledging to dilute predation risk, and (3) variable parental provisioning according to timing of breeding. To elucidate the effects of growth rate and hatching date on fledging age and mass, and to test those mechanistic hypotheses, we measured chick growth and fledging periods in Rhinoceros Auklets (Cerorhinca monocerata) at Teuri Island from 1995 to 2000. The multiple-linear regression analysis showed that intrayear variations of fledging age and mass were explained by growth rate or hatching date in five out of six years. Faster-growing chicks fledged younger and heavier, and earlier-hatched chicks fledged older and heavier. Consequently, no apparent correlation between fledging age and mass was observed in five out of six years. Analysis of interyear variation showed a negative correlation between fledging age and mass, which indicates that growth rates rather than hatching dates had a major effect. Wing length at fledging was independent of growth in mass. More than 80% of chicks fledged when they attained a narrow range of wing length (130–150 mm), presumably because they remained in their nests until they attained the critical wing length. In five out of six years, the chicks did not synchronize timing of fledging relative to timing of hatching. Later-hatched chicks attained lighter peak masses and at younger ages, which may indicate that their parents decreased provisioning rates when the chicks were still young. We suggest that (1) critical wing length at fledging and (2) variable parental provisioning according to timing of breeding could be underlying mechanisms determining these relationships between fledging age and mass.

scholarly journals Therapeutic Strategy of Percutaneous Transforaminal Endoscopic Decompression for Stenosis Associated With Adult Degenerative Scoliosis

2020 ◽  
pp. 219256822095903
Author(s):  
Lin-Yu Jin ◽  
Kun Wang ◽  
Zhen-Dong Lv ◽  
Xin-Jin Su ◽  
Hai-Ying Liu ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Cobb Angle ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Lumbar Stenosis ◽  
Degenerative Scoliosis ◽  
Adult Degenerative Scoliosis ◽  
Lateral Subluxation ◽  
The Mean ◽  
Transforaminal Endoscopic Surgery

Study Design: A retrospective study. Objective: To investigate the effects of percutaneous transforaminal endoscopic decompression (PTED) for lumbar stenosis associated with adult degenerative scoliosis and to analyze the correlation between preoperative radiological parameters and postoperative surgical outcomes. Methods: Two years of retrospective data was collected from 46 patients with lumbar stenosis associated with adult degenerative scoliosis who underwent PTED. The visual analog scale (VAS), Oswestry Disability Index, and modified MacNab criteria were used to evaluate the clinical outcomes. Multiple linear regression analysis was used to analyze the correlation between radiological parameters and surgical outcomes. Results: The mean age of the 33 female and 13 male patients was 73.5 ± 8.1 years. The mean follow-up was 27.6 ± 3.5 months (range from 24 to 36). The average coronal Cobb angle was 24.5 ± 8.2°. There were better outcomes of the VAS for leg pain and Oswestry Disability Index after surgery. Based on the MacNab criteria, excellent or good outcomes were noted in 84.78% of patients. Multiple linear regression analysis showed that Cobb angle and lateral olisthy may be the predictors for low back pain. Conclusion: Transforaminal endoscopic surgery may be an effective and safe method for geriatric patients with lumbar stenosis associated with degenerative scoliosis. The predictive factors of clinical outcomes were severe Cobb angle and high degree lateral subluxation. Transforaminal endoscopic surgery may not be recommended for patients with Cobb angle larger than 30° combined with lateral subluxation.

scholarly journals Cluster and regression analysis for predicting salinity in groundwater

2018 ◽  
Vol 192 ◽  
pp. 02007
Author(s):  
Phiraphat Aphiphan ◽  
Uma Seeboonruang ◽  
Somyot Kaitwanidvilai
Keyword(s):  
Electrical Conductivity ◽  
Regression Analysis ◽  
Linear Regression ◽  
Regression Model ◽  
Multiple Linear Regression ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Water Levels ◽  
Groundwater Salinity ◽  
Groundwater Levels

Groundwater salinity is a major problem particularly in the northeastern region of Thailand. Saline groundwater can cause widespread saline soil problem resulting in reducing agricultural productivity as in the Lower Nam Kam River Basin. In order to better manage the salinity problem, it is important to be able to predict the groundwater salinity. The objective of this research was to create a cluster-regression model for predicting the groundwater salinity. The indicator of groundwater salinity in this study was electrical conductivity because it was simple to measure in field. Ninety-eight parameters were measured including precipitation, surface water levels, groundwater levels and electrical conductivity. In this study, the highest groundwater salinity at 3 wells was predicted using the combined cluster and multiple linear regression analysis. Cross correlation and cluster analysis were applied in order to reduce the number of parameters to effectively predict the quality. After the parameter selection, multiple linear regression was applied and the modeling results obtained were R2 of 0.888, 0.918, and 0.692, respectively. This linear regression model technique can be applied elsewhere in the similar situation.

Age, growth and mortality of redfish Centroberyx affinis

2001 ◽  
Vol 52 (4) ◽  
pp. 637 ◽  
Author(s):  
A. K. Morison ◽  
K. R. Rowling
Keyword(s):  
Growth Rate ◽  
Significant Variation ◽  
Fork Length ◽  
Age And Growth ◽  
Average Error ◽  
Natural Mortality ◽  
Commercial Catch ◽  
Thin Sections ◽  
The Mean ◽  
Age Estimates

Age and growth of 5678 redfish, collected during 1991–98 from Australia’s South East Fishery, were estimated from thin sections of otoliths. A maximum age of 44 years was recorded for a 30 cm (fork length) female, but 80%of females in the commercial catch were <10 years, and 80%of males were <13 years. The largest was a 34 cm female estimated to be 36 years old. Repeated age estimates of a subsample revealed an average error of 3.79%. There was significant variation in the mean length-at-age among years, and there were significant effects for age*year, age*sex, age*region, region*year, and sex*region*year interactions. Assessments of the fishery have assumed a single stock, because tagging results from the 1980s indicate movement of redfish along the coast. This study found consistent differences in sex ratio and growth rate between regions, which indicate some structuring within the population. However, the differences in growth rates are not consistent among years and could not be explained by differences in depths fished, suggesting a more dynamic situation than spatially segregated stocks. Estimates of natural mortality ranged from 0.07 to 0.11 year–1 and differed between regions.

scholarly journals Analisis Faktor – Faktor Yang Mempengaruhi Price Earning Ratio pada Perusahaan Manufaktur yang Listing di BEI

2020 ◽  
Vol 30 (12) ◽  
pp. 3220
Author(s):  
Oktavia Komala Sari ◽  
Lilik Handajani ◽  
Endar Pituringsih
Keyword(s):  
Growth Rate ◽  
Regression Analysis ◽  
Linear Regression Analysis ◽  
Secondary Data ◽  
Sampling Technique ◽  
Multiple Linear Regression Analysis ◽  
Manufacturing Companies ◽  
Equity Ratio ◽  
Independent Variable ◽  
Profit Growth

This study aims to analyze what factors can affect the Price Earning Ratio (PER). Several factors that are considered to be able to influence PER which is used as a variable in this study, namely Return On Asset (ROA), Debt To Equity Ratio (DER), Dividend Pay Out Ratio (DPR), and Profit Growth Rate. . The population used is manufacturing companies listed on the IDX for the 2016-2018 period. With the purposive sampling technique, obtained 13 companies that will be used as research samples. The data used are secondary data. To see the effect of the independent variable on the dependent variable, multiple linear regression analysis tests were carried out which previously carried out the classical assumption test. Based on the results of the study, it is known that partially the results show that ROA, DPR, and Profit Growth Rate respectively have a significant effect on PER while DER has no significant effect on PER. Keywords: PER; ROA; DER; DPR; Profit Growth Rate.

scholarly journals Stigma Among Patients with HIV/AIDS: A Cross Sectional Study in Malaysia

2019 ◽  
Vol 4 (1) ◽  
pp. 26
Author(s):  
Azreen Abdullah ◽  
Adibah Hanim Ismail ◽  
Ching Siew Mooi
Keyword(s):  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Cross Sectional Study ◽  
Hiv Stigma ◽  
People Living With Hiv ◽  
Sectional Study ◽  
Cross Sectional ◽  
The Mean ◽  
Living With Hiv ◽  
Hiv Aids

Introduction:HIV stigma refers to negative beliefs, feelings and attitudes towards people living with HIV (PLWH), groups associated with PLWH and other key populations at higher risk of HIV infection, such as people who inject drugs, sex workers, men who have sex with men and transgender people. Despite the advancement made in the knowledge and treatment of HIV, PLWH continues to be stigmatized.Objective: To determine the level of HIV stigma and its predictors among people living with HIV/AIDS in a tertiary hospital in Malaysia.Methods: A cross sectional study was conducted among HIV/AIDS patients aged 18 and above at infectious disease clinic in Hospital Sungai Buloh, Gombak, Malaysia. HIV stigma was assessed using Berger’s HIV stigma scale, which is available in Bahasa Malaysia and English.A self-administered questionnaire was used to determine their demographic and clinical characteristics. Multiple linear regression analysis was used to identify the predictors.Results: 526 subjects participated in this study. The mean age of the study population was 33.5± 8.4 years. The majority of the participants were male (90.9%) and contracted HIV through sexual activities (87.8%). The mean score of HIV stigma was 104.7 ± 19.5. Based on multiple linear regression analysis, patients who were unemployed (B = -8.00, 95% confidence interval (CI) = -12.12,-3.88, p = < 0.001) and being on antiretroviral treatment (B = 4.95, 95% (CI) = 0.30, 9.60, p = < 0.037) had higher level of HIV stigma.Conclusions: The level of HIV stigma was high (mean score =104.7 ± 19.5). HIV/AIDS patients who are unemployed and on antiretroviral agents were at risks of having higher level of HIV stigma. Future study is needed urgently to implement intervention that can minimize the stigmatization among patients with HIV/AIDS.International Journal of Human and Health Sciences Vol. 04 No. 01 January’20 Page : 26-35

scholarly journals Effects of nurses’ shiftwork characteristics and aspects of private life on work-life conflict

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0242379
Author(s):  
Hye-Kyung Oh ◽  
Sung-Hyun Cho
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Work Life ◽  
Private Life ◽  
Leisure Constraints ◽  
Private Lives ◽  
Significant Factors ◽  
Work Life Conflict

Background As nurses work highly irregular hours, the characteristics of shiftwork and aspects of their private lives are important factors that may contribute significantly to work-life conflict. Purpose This study examined the effects of nurses’ shiftwork characteristics and aspects of their private lives on work-life conflict. Methods The participants included 271 registered nurses working three-shift rotations in five types of units at four hospitals in South Korea. We distributed structured questionnaires regarding shiftwork characteristics, private life, and work-life conflict. Data were analyzed using multiple linear regression analysis. Results The significant factors relating to work-life conflict included control over shift start and finish times (β = -0.16, p = .019), frequency of swapping shifts with colleagues (β = 0.15, p = .025) among shiftwork characteristics, and leisure constraints (β = 0.39, p = < .001) in aspects of private life. Conclusion Plan and policies for improving nursing environments should focus on improving nurses’ control over shiftwork and decreasing leisure constraints.

scholarly journals Insight and Associated Factors among Patients with Schizophrenia in Mental Specialized Hospital, Ethiopia, 2018

2019 ◽  
Vol 2019 ◽  
pp. 1-5 ◽  
Author(s):  
Mandaras Tariku ◽  
Demeke Demilew ◽  
Tolesa Fanta ◽  
Meskerem Mekonnen ◽  
Dessie Abebaw Angaw
Keyword(s):  
Associated Factors ◽  
Linear Regression Analysis ◽  
Prognostic Indicator ◽  
Multiple Linear Regression Analysis ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Specialized Hospital ◽  
First Onset ◽  
The Mean ◽  
Negative Syndrome

Background. Insight is the degree of the patient’s awareness and understanding of their attributions, feelings, behavior and disturbing symptoms. Majority of the patients with schizophrenia have poor insight and insight is an important prognostic indicator in schizophrenia to enhance treatment compliances and reducing the risks of clinical deterioration. The main objective of this study was to assess insight and its associated factors among patients with schizophrenia at mental specialized hospital in Ethiopia. Methods. Institutional based cross-sectional study was conducted from May to June 2018 Mental Specialized Hospital among 455 patients with schizophrenia. Insight was measured by an abridged version of Scale to assess unawareness of mental disorder. Positive and Negative Syndrome Scale, Calgary depressive scale, Oslo social support scale was used to identify factors associated with insight. Simple and multiple linear regression analysis were used to assess associated factors of insight in the participants. Results. The mean score of insight was 13.66 (95% CI 13.27, 14.04). Age at first onset of illness, duration of treatments, depressive symptoms were inversely associated with mean insight score; whereas unemployed, positive and negative syndrome, previous hospitalization, >=2 episodes were positively associated with mean insight score. Conclusion. Nearly half of the study participants were scored above the mean insight score so, the clinicians and psychotherapists should have to work together to improve insight among patients with schizophrenia.

scholarly journals Pretreatment Neutrophil-to-Lymphocyte Ratio Predicts Prognosis in Patients with Diabetic Macular Edema Treated with Ranibizumab

2019 ◽  
Author(s):  
Yuxiang Hu ◽  
Yi Cheng ◽  
Xiaoxuan Xu ◽  
Bo Yang ◽  
Feng Mei ◽  
...  
Keyword(s):  
Macular Edema ◽  
Diabetic Macular Edema ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Neutrophil To Lymphocyte Ratio ◽  
Clinicopathological Parameters ◽  
Intravitreal Ranibizumab ◽  
Lymphocyte Ratio ◽  
Treatment Naïve ◽  
The Mean

Abstract Background: To investigate the prognostic value of the neutrophil-to-lymphocyte ratio (NLR) in patients with diabetic macular edema (DME) treated monthly with ranibizumab. Methods: We retrospectively analyzed the medical records of all patients who received intravitreal ranibizumab (IVR) treatment for DME at the First Affiliated Hospital of Nanchang University between December 2015 and December 2017. Clinicopathological parameters, including NLR, were evaluated to identify predictors of better outcomes of IVR monotherapy. Results: Ninety-one treatment-naïve eyes treated with IVR for DME were retrospectively analyzed in this study. Baseline best-corrected visual acuity (BCVA), neutrophils, NLR, monocyte-to-lymphocyte ratio, and platelet-to-lymphocyte ratio were negatively correlated with the changes in BCVA at 24 weeks compared with the baseline, while baseline central retinal thickness and lymphocytes were positively correlated with the changes in BCVA at 24 weeks compared with the baseline. Multiple linear regression analysis revealed that NLR was independently associated with the mean change of BCVA between baseline and week 24. In addition, patients with NLR < 2.27 showed a better improvement in letter score than those with NLR > 2.27. Conclusion: Pretreatment NLR is independently associated with the BCVA in DME patients treated with IVR, and higher pretreatment NLR may contribute to inferior BCVA outcomes.

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