Geohazard Risk Assessment Method Based on Logistic Regression Model

2012 ◽  
Vol 588-589 ◽  
pp. 1934-1937
Author(s):  
Si Cheng ◽  
Yun Sheng Wang ◽  
Fei Yu Chen
Keyword(s):  
Logistic Regression ◽  
Regression Model ◽  
Logistic Regression Model ◽  
Assessment Method ◽  
Risk Assessment Method ◽  
Geological Factor ◽  
Independent Variable ◽  
Geohazard Risk ◽  
Relationship Of ◽  
The Relationship

Logistic regression model refers a regress analysis contains two types of variants. In geohazard analysis, each geological factor can be defined as independent variable, whether a geohazard happened or not can be defined as a dependent variable. 1 represents an occurrence of a hazard while 0 represents a hazard doesn’t break out. Because those factors aren’t continual variable, lineal regress is inadequate to deduce the relationship of such kind of independent and dependent variable. Therefore using logistic regress method is a feasible way to solve such technique problem.

Importance of attack speed in volleyball

2013 ◽  
Vol 9 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Gilbert W. Fellingham ◽  
Lee J. Hinkle ◽  
Iain Hunter
Keyword(s):  
Logistic Regression ◽  
Regression Model ◽  
High Speed ◽  
Logistic Regression Model ◽  
Single Male ◽  
Bayesian Paradigm ◽  
Probability Of Success ◽  
University Level ◽  
Relationship Of ◽  
The Relationship

Abstract In this paper we examine the relationship of the speed of a set in volleyball with the outcome of the attack. A total of 1777 sets of a single male university level volleyball team were photographed using high speed cameras so that the time the set was in the air could be measured with accuracy to 1/100th of a second. Data were analyzed using a logistic regression model implemented using the Bayesian paradigm. Using these methods the probability of a kill resulting from a set of a particular speed could be calculated. In general, sets that traveled a further distance had significant increases in the probability of success with a faster set. No trends were seen with sets that were delivered to hitters that were closer to the setter. Decreasing outside set time from 1.53 to 0.85 s, significantly increased probability of a kill from 0.31 to 0.58 for the team studied. The speed of the set when the attacker is not near the setter appears to be an important component in the success of the attack in male collegiate volleyball.

The relationship between disability and suicide: prospective evidence from the Ten to Men cohort

2018 ◽  
Vol 41 (4) ◽  
pp. 707-713 ◽  
Author(s):  
Allison Milner ◽  
Anne-Marie Bollier ◽  
Eric Emerson ◽  
Anne Kavanagh
Keyword(s):  
Mental Health ◽  
Logistic Regression ◽  
Regression Model ◽  
Logistic Regression Model ◽  
People With Disabilities ◽  
Cross Sectional ◽  
Longitudinal Cohort ◽  
The Past ◽  
The Relationship

Abstract Background People with disabilities often face a range of social and economic adversities. Evidence suggests that these disadvantages result in poorer mental health. Some research also indicates that people with disabilities are more likely experience thoughts about suicide than people without disability, although most of this research is based on small cross-sectional samples. Methods We explored the relationship between self-reported disability (measured at baseline) and likelihood of reporting thoughts of suicide (measured at follow up) using a large longitudinal cohort of Australian males. A logistic regression model was conducted with thoughts of suicide within the past 12 months (yes or no) as the outcome and disability as the exposure. The models adjusted for relevant confounders, including mental health using the SF-12 MCS, and excluded males who reported thoughts of suicide at baseline. Results After adjustment, there was a 1.48 (95% CI: 0.98–2.23, P = 0.063) increase in the odds of thoughts of suicide among men who also reported a disability. The size of association was similar to that of being unemployed. Conclusions Males reporting disability may also suffer from thoughts of suicide. We speculate that discrimination may be one explanation for the observed association. More research on this topic is needed.

Nucleated Red Blood Cells in Children with Sickle Cell Disease Hospitalized for Acute Vaso-Occlusive Pain

Blood ◽  
2016 ◽  
Vol 128 (22) ◽  
pp. 4763-4763
Author(s):  
Josiah Ballantine ◽  
Robert I. Liem
Keyword(s):  
Logistic Regression ◽  
Sickle Cell Disease ◽  
Regression Model ◽  
Blood Cells ◽  
Logistic Regression Model ◽  
Transfusion Requirement ◽  
Cell Disease ◽  
Nucleated Red Blood Cells ◽  
The Relationship ◽  
Median Admission

Background: Acute vaso-occlusive crises (VOC) represent the most common reason for hospitalization among children with sickle cell disease (SCD). Acute chest syndrome (ACS) and severe hemolysis, both of which may require transfusion, are common complications during hospitalizations for VOC. Despite the high morbidity associated with these complications, there are currently no reliable clinical predictors of ACS and transfusion requirement in this setting. Nucleated red blood cells (NRBC), reported as the number of NRBC/100 white blood cells (WBC) on a complete blood count (CBC), may reflect marrow necrosis or increased erythropoetic drive, yet their relationship to VOC and its complications have not been studied. We aimed to evaluate the relationship between admission NRBC and development of ACS or transfusion requirement in children with SCD hospitalized for VOC. We hypothesized that higher admission NRBC is associated with greater risk of ACS/transfusion in this population. Methods: We performed a single-institution, retrospective review of all hospitalizations from 2011 through 2015 for uncomplicated VOC in children with SCD. Hospitalization encounters were identified by ICD-9 codes for SCD and use of parenteral opioids for at least 24 hours in the electronic medical record. Data extracted from encounters meeting inclusion/exclusion criteria included all CBCs and clinical outcomes. Between-group comparisons were performed by Mann-Whitney U test and Pearson's chi-square test for continuous and categorical variables, respectively, as well as by Spearman's rank order correlation (SPSS V24). The relationship of admission and change in NRBC (∆NRBC) to complications was evaluated by binary logistic regression and adjusted for significant co-variates on bivariate analysis. For ∆NRBC, we used the final CBC obtained prior to a complication or prior to discharge for encounters not resulting in a complication. Results: We reviewed 271 encounters for uncomplicated VOC in 96 patients (mean age 13.1 years, 47% male, and 76% Hb SS or S/β0 thalassemia). Overall, 48/271 (18%) encounters for VOC resulted in ACS/transfusion, or both. Median NRBC on admission was 2 /100 WBC (range 0 to 137 /100 WBC) for all encounters. Admission NRBC was significantly correlated with age (r = 0.15, p = 0.02), % reticulocytes (r = 0.18, p < 0.01) and hemoglobin (r = 0.39, p < 0.001). Median admission NRBC was higher among patients on hydroxyurea (3 vs. 1.8 /100 WBC, p < 0.01) but did not differ by sex or genotype. In general, median admission NRBC did not differ between hospitalizations that did or did not result in ACS/transfusion (2 vs 2.5 /100 WBC, p = 0.91). In our logistic regression model that included NRBC, % reticulocytes, WBC, hemoglobin, platelets and genotype as co-variates, only lower hemoglobin (p = 0.02) and higher WBC (p < 0.001) on admission were independently associated with ACS/transfusion. A second CBC was obtained in 110/271 (41%) encounters reviewed. Median ∆NRBC was 0 /100 WBC (range -37 to 116 /100 WBC) in these encounters. ∆NRBC was significantly correlated with age (r = 0.2, p = 0.04) but not with change in other lab values. Median ∆NRBC was higher among patients with a history of hypertension (0 vs. 13 /100 WBC, p < 0.01) but did not differ by hydroxyurea status, sex or genotype. Importantly, we found that median ∆NRBC was significantly higher in hospitalizations that resulted in ACS/transfusion compared to those that did not (0 vs 2 /100 WBC, p < 0.01). By logistic regression, greater ∆NRBC (p < 0.01) and lesser ∆platelets (p = 0.04) were independently associated with higher risk of ACS/transfusion after adjustment for ∆hemoglobin and genotype. A receiver operating characteristic curve constructed from a logistic regression model that included only ∆NRBC, admission WBC, admission hemoglobin and ∆platelets resulted in an area under the curve of 0.82. Conclusions: We found no relationship between admission NRBC and complications during hospitalization for VOC in children with SCD. Greater ∆NRBC, however, was independently associated with development of ACS/transfusion requirement during hospitalization for VOC, suggesting ∆NRBC may represent a useful biomarker for predicting complications in children with SCD hospitalized for VOC. Clinical decision rules that incorporate the careful monitoring of ∆NRBC in this setting should be prospectively studied. Disclosures No relevant conflicts of interest to declare.

scholarly journals Quantifying the Robustness of the English Sibilant Fricative Contrast in Children

2015 ◽  
Vol 58 (3) ◽  
pp. 622-637 ◽  
Author(s):  
Jeffrey J. Holliday ◽  
Patrick F. Reidy ◽  
Mary E. Beckman ◽  
Jan Edwards
Keyword(s):  
Logistic Regression ◽  
Regression Model ◽  
Logistic Regression Model ◽  
Mixed Effects ◽  
Vocabulary Size ◽  
Phonological Contrast ◽  
Different Types ◽  
Centroid Frequency ◽  
The Relationship ◽  
Children's Speech

Purpose Four measures of children's developing robustness of phonological contrast were compared to see how they correlated with age, vocabulary size, and adult listeners' correctness ratings. Method Word-initial sibilant fricative productions from eighty-one 2- to 5-year-old children and 20 adults were phonetically transcribed and acoustically analyzed. Four measures of robustness of contrast were calculated for each speaker on the basis of the centroid frequency measured from each fricative token. Productions that were transcribed as correct from different children were then used as stimuli in a perception experiment in which adult listeners rated the goodness of each production. Results Results showed that the degree of category overlap, quantified as the percentage of a child's productions whose category could be correctly predicted from the output of a mixed-effects logistic regression model, was the measure that correlated best with listeners' goodness judgments. Conclusions Even when children's productions have been transcribed as correct, adult listeners are sensitive to within-category variation quantified by the child's degree of category overlap. Further research is needed to explore the relationship between the age of a child and adults' sensitivity to different types of within-category variation in children's speech.

scholarly journals The Relationship Between Tactical Positioning and the Race Outcome in 800-M Running at the 2016 Olympic Games and 2017 IAAF World Championship

2020 ◽  
Vol 71 (1) ◽  
pp. 299-305
Author(s):  
Fernando González-Mohíno ◽  
Jesús Santos del Cerro ◽  
Andrew Renfree ◽  
Inmaculada Yustres ◽  
José Mª González-Ravé
Keyword(s):  
Logistic Regression ◽  
Regression Model ◽  
Logistic Regression Model ◽  
Olympic Games ◽  
Area Under The Curve ◽  
Predictive Ability ◽  
Significance Test ◽  
Final Position ◽  
The Difference ◽  
The Relationship

AbstractThe purpose of this analysis was to quantify the probability of achieving a top-3 finishing position during 800-m races at a global championship, based on dispersion of the runners during the first and second laps and the difference in split times between laps. Overall race times, intermediate and finishing positions and 400 m split times were obtained for 43 races over 800 m (21 men’s and 22 women’s) comprising 334 individual performances, 128 of which resulted in higher positions (top-3) and 206 the remaining positions. Intermediate and final positions along with times, the dispersion of the runners during the intermediate and final splits (SS1 and SS2), as well as differences between the two split times (Dsplits) were calculated. A logistic regression model was created to determine the influence of these factors in achieving a top-3 position. The final position was most strongly associated with SS2, but also with SS1 and Dsplits. The Global Significance Test showed that the model was significant (p < 0.001) with a predictive ability of 91.08% and an area under the curve coefficient of 0.9598. The values of sensitivity and specificity were 96.8% and 82.5%, respectively. The model demonstrated that SS1, SS2 and Dplits explained the finishing position in the 800-m event in global championships.

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