scholarly journals On the Sensitivity of a Regression Coefficient to Monotonic Transformations

1990 ◽  
Vol 6 (2) ◽  
pp. 165-169 ◽  
Author(s):  
Shlomo Yitzhaki
Keyword(s):  
Regression Coefficient ◽  
Regression Coefficients ◽  
Monotonic Transformation

This note presents a procedure which enables the user to check whether a monotonic transformation can change the sign of a regression coefficient. One possible use of this procedure is to examine the robustness of key regression coefficients.

scholarly journals Type 2 diabetes is more predictable in women than men by multiple anthropometric and biochemical measures

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tangying Li ◽  
Huibiao Quan ◽  
Huachuan Zhang ◽  
Leweihua Lin ◽  
Lu Lin ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Type 2 Diabetes ◽  
Diastolic Blood Pressure ◽  
Roc Analysis ◽  
Operating Characteristic ◽  
Regression Coefficient ◽  
Regression Coefficients ◽  
Sexually Dimorphic ◽  
Fasting Insulin

AbstractMen and women are sexually dimorphic but whether common anthropometric and biochemical parameters predict type 2 diabetes (T2D) in different ways has not been well studied. Here we recruit 1579 participants in Hainan Province, China, and group them by sex. We compared the prediction power of common parameters of T2D in two sexes by association, regression, and Receiver Operating Characteristic (ROC) analysis. HbA1c is associated with FPG stronger in women than in men and the regression coefficient is higher, consistent with higher prediction power for T2D. Age, waist circumference, BMI, systolic and diastolic blood pressure, triglyceride levels, total cholesterol, LDL, HDL, fasting insulin, and proinsulin levels all predict T2D better in women. Except for diastolic blood pressure, all parameters associate or tend to associate with FPG stronger in women than in men. Except for diastolic blood pressure and fasting proinsulin, all parameters associate or tend to associate with HbA1c stronger in women than in men. Except for fasting proinsulin and HDL, the regression coefficients of all parameters with FPG and HbA1c were higher in women than in men. Together, by the above anthropometric and biochemical measures, T2D is more readily predicted in women than men, suggesting the importance of sex-based subgroup analysis in T2D research.

scholarly journals ANALISIS FAKTOR-FAKTOR YANG MEMPENGARUHI MINAT BELI KONSUMEN PADA SITUS JUAL-BELI ONLINE

2020 ◽  
Vol 6 (2) ◽  
pp. 179
Author(s):  
I Gede Andri Setiawan ◽  
Sukardi Sukardi
Keyword(s):  
Data Analysis ◽  
Risk Perception ◽  
Linear Regression ◽  
Multiple Linear Regression ◽  
Significant Influence ◽  
Regression Coefficient ◽  
Regression Coefficients ◽  
Test Results ◽  
Price Perception ◽  
Usefulness Perception

The purpose of this study were to analyze (1) the influence of trust of the purchase interest of online shop consumers, (2) the influence of risk perception of the  purchase  interest  of  online  shop  consumers,  (3)  the  influence  of  use fulness perception of the purchase interest of online shop consumers, (4) the influence of price perception of the purchase interest of online shop consumers. The populations in this research are  student of Ahmad Dahlah University Yogyakarta  Campus  One.  The  method  sample  is  purposif  sampling  with  the number  of  sample  as  much  as  100  respondents  from  three  Faculty  that  is, Economy  Faculty,  Psycology  Faculty,  and  FTDI.  Collecting  data  using questionnaires  that  was  done  validity  test  and  realibity  test.  This  research  was done by using multiple linear regression data analysis. The  results  of  this  study  indicate  that  (1)  the  trust  is  not  significant influence on consumer purchase interest of the sites online shop, this is evidenced by the significant value  is bigger  than the probability alpha value of 0.05 (0,206 > 0.05), and the regression coefficient has a  positive value of 0.062; (2)  the  trust is not significant influence on consumer purchase interest of the sites online shop, this  is  evidenced  by  the  significant  value  is  bigger  than  the  probability  alpha value of 0.05 (0, 0,234 > 0.05), and the regression coefficient has a positive value of  0.057;  (3)  the  usefulness  perception  is  significant  influence  on  consumer purchase interest of the sites online shop, this is evidenced by the significant value is  smaller  than  the  probability  alpha  value  of  0.05  (0.000  <  0.05),  and  the regression coefficients has a positive value of 0.456; (4) the price perception is not significant  influence on consumer purchase interest of the sites online shop, this  is  evidenced  by  the  significant  value  is  bigger  than  the  probability  alpha value of 0.05 (0.066 > 0.05), and the regression coefficient has a  positive value of  0.111;  and  (5)  trust,  risk  perception,  usefulness  perception  and  price perception  together  have  an  effect  on  consumer  purchase  interest  of  the  sites online  shop,  this  is  evidenced  by  the  significant  value  is  smaller  than  the probability alpha value of 0.05 (0.000 < 0.05). The R2 test results in this study was obtained  R2 value  of  0.413.  This  shows  that  purchase  interest  is  influenced  by trust, risk perception, use perception, and price  perception by 41.3%, while the remaining 58.7% is influenced by other factors not observed by the researcher or considered fixed.

scholarly journals Menakar Struktur Kepemilikan Saham dan Kinerja Perusahaan

2020 ◽  
Vol 17 (3) ◽  
pp. 457
Author(s):  
Mayroza Wiska
Keyword(s):  
Ownership Structure ◽  
Capital Market ◽  
Regression Coefficient ◽  
Stock Exchange ◽  
Positive Influence ◽  
Regression Coefficients ◽  
Public Ownership ◽  
Test Analysis ◽  
Mining Company ◽  
Normality Test

ABSTRACTAnalysis of Performance Shareholding Structure of the Company (a mining company listed on the Indonesia Stock Exchange. In preparation of this paper, the authors have conducted research on the Indonesia Stock Exchange (Capital Market Information Center-Padang) Jl.Pondok 90 Padang. The purpose of this study was to determine the effect of ownership structure on corporate performance in the mining company listed on the Indonesia Stock Exchange (BEI. The analysis in this research using descriptive statistics, classic assumption test (test mulitikolonieritas, autokolerasi test, normality test), analysis of regression coefficient test, partial regression coefficients (t test), testing regression coefficients together (test f). As for the overall analysis of this data with the help of a software program SPSS version 21.0 for Windows. Results of this study concluded that: (1) public ownership structure positively affects the performance of companies in the mining company listed on the Indonesia Stock Exchange (BEI). (2) The structure of stock ownership is not a positive influence on the company's performance in the mining company listed on the Indonesia Stock Exchange (BEI). (3) The structure of public ownership and foreign ownership together affect the company's performance in the mining company listed on the Indonesia Stock Exchange (BEI).

STUDIES ON APPLE ROOTSTOCK SELECTIONS RELATING RESPIRATION RATES TO AN ANATOMICAL METHOD OF PREDICTING DWARFNESS

1961 ◽  
Vol 41 (2) ◽  
pp. 221-226 ◽  
Author(s):  
S. R. Miller ◽  
H. B. Heeney ◽  
S. H. Nelson
Keyword(s):  
Respiration Rate ◽  
Regression Coefficient ◽  
Regression Coefficients ◽  
Parent Plant ◽  
Apple Rootstock ◽  
Root Tips ◽  
Respiration Rates ◽  
Related Series ◽  
Significant Regression ◽  
Leaf Disks

The respiration rates of leaf disks and root tips of apple rootstock selections are related to the per cent of bark in the root which has been shown to be an index of dwarfing potential. In 1958 and 1959 significant regression coefficients were shown between the respiration rate of leaf disks and the per cent of bark in the roots. A highly significant regression coefficient was obtained between the respiration rate of the root tips from rooted softwood cuttings and the known per cent of bark in the root of the parent plant. The data indicate that the respiration rate of leaf disks or root tips would be a satisfactory measure of dwarfing potential within a closely related series of apple rootstock selections.

The relationship between live weight of ewe at mating and weight of newborn lamb

1970 ◽  
Vol 12 (2) ◽  
pp. 273-280 ◽  
Author(s):  
H. P. Donald ◽  
W. S. Russell
Keyword(s):  
Birth Weight ◽  
Regression Coefficient ◽  
Live Weight ◽  
Regression Coefficients ◽  
Regression Equations ◽  
Newborn Lamb ◽  
Litter Weight ◽  
The Relationship

SUMMARYRegression of litter weight of newborn lambs on the live weight of ewes at mating has been estimated from data on 15 breeds after conversion of group means of ewes and lambs to natural logarithms. Regression coefficients were estimated to be 0·721 for single lambs, 0·741 for twins and 0·773 for triplets. These values are not signi-ficantly different from each other. Data from ewes with single lambs and from ewes with twins are consistent with the hypothesis that litter weight at birth as a proportion of ewe weight at mating tends to dechne as ewe weight rises from small to large breeds. In a breed with ewes averaging 25 kg the expected birth weight of singles is 9·6% and of twins 15·2%, of ewe weight. For a breed with ewes of 100 kg the corresponding weights would be 6·5% and 10·6% of ewe weight. Since the estimated regression coefficient and the coefficient in the expression for metabolic weight (0·730) are alike, the regression equations can be interpreted as showing that single lambs were 22·6% and twin pairs 36·1% of ewes' metabolic weight.

An evaluation of body size as related to weight of three West African breeds of cattle in Nigeria

1980 ◽  
Vol 95 (1) ◽  
pp. 219-224 ◽  
Author(s):  
V. Buvanendran ◽  
J. E. Umoh ◽  
B. Y. Abubakar
Keyword(s):  
Body Weight ◽  
Body Size ◽  
Regression Coefficient ◽  
West African ◽  
The Other ◽  
Regression Coefficients ◽  
Body Measurements ◽  
Linear Regression Coefficient ◽  
Chest Girth ◽  
Body Condition Scores

SummaryBody measurements and weights of animals of varying ages were recorded in White Fulani (Bunaji), Sokoto Gudali and N'dama breeds of cattle. Chest girth accounted for 86–96% of the variation in body weight in the three breeds. The linear regression coefficient of weight on chest girth in the N'dama differed significantly from the other two breeds. Within each breed, the regression coefficient of young animals was lower than those of older groups. The variables that contributed most to improving the prediction of weights when added to chest girth were rump length and body length. Animals with low body condition scores had lower regression coefficients of weight on chest girth than those with high scores.

scholarly journals KORELASI PANJANG RADIUS DENGAN TINGGI BADAN PADA MAHASISWA FAKULTAS KEDOKTERAN UNSRAT ANGKATAN 2010

2013 ◽  
Vol 4 (3) ◽  
Author(s):  
Raja M. Simatupang ◽  
Shane H. R. Ticoalu ◽  
Djon Wongkar
Keyword(s):  
Regression Coefficient ◽  
Descriptive Study ◽  
The Body ◽  
Regression Coefficients ◽  
Post Mortem ◽  
Severe Damage ◽  
Radial Length ◽  
Males And Females

Abstract: There has been an increase in cases of post-mortem mutilated victims in recent years. Therefore, investigators have to use some methods to identify the mutilated victims. Measuring the length of a body when it is still intact is not difficult, but the challenge will arise when the body has undergone severe damage or is not intact anymore. This study aimed to determine the correlation of the length of the radius to height. This was a descriptive study. Samples were 140 students (males and females) of the Faculty of Medicine, University of Sam Ratulangi Manado. The results showed that by using the regression coefficient in males: height = 84 + 3.2 x average radial length, the regression coefficient 3.2 means that a male’s height increases 3.2 cm for each 1 cm increase of radial length. However, the regression coefficient for females: height = 56 + 4.1 x average radial length, the regression coefficient 4.1 means that height increases 4.1 cm for each 1 cm increase of radial length. Conclusion: Height can be determined by the avereage radial length by using the regression coefficients for males 4.1 and for females 3.2. Keywords: gender, radial length, height.   Abstrak: Terjadinya peningkatan kasus-kasus korban mutilasi pada akhir-akhir ini membuat penulis berpikir bahwa proses identifikasi sangat dibutuhkan oleh penyidik untuk mengungkap identitas korban mutilasi tersebut. mengukur panjang badan jenazah bila masih utuh bukanlah merupakan suatu pekerjaan yang sulit, namun kesulitan akan muncul bila jenazah mengalami kerusakan yang sangat hebat atau tidak lagi utuh. Penelitian ini bertujuan untuk menentukan nilai korelasi panjang radius dengan tinggi badan pada mahasiswa/i Fakultas Kedokteran Universitas Sam Ratulangi Manado. Penelitian ini bersifat deskriptif. Sampel terdiri dari 140 mahasiswa/i. Hasil penelitian memperlihatkan bahwa pada laki-laki tinggi badan (TB) = 84 + 3,2 x panjang rata-rata radius. Nilai koefisien regresi 3,2 berarti tinggi badan pada laki-laki akan bertambah sebesar 3,2 cm bila panjang rata-rata tulang radius bertambah 1 cm. Pada perempuan TB= 56 + 4,1 x panjang rata-rata radius. Nilai koefisien regresi 4,1 berarti tinggi badan pada perempuan akan bertambah sebesar 4,1 cm bila panjang rata-rata tulang radius bertambah 1 cm. Simpulan: Tinggi badan dapat ditentukan dengan menggunakan panjang rata-rata radius dan koefisien regresi yaitu untuk laki-laki 4,1 dan untuk perempuan 3,2. Kata kunci: jenis kelamin, panjang radius, tinggi badan.

scholarly journals Hypothesis Testing on Regression: Investigating Students’ Skill

2018 ◽  
Vol 7 (4.33) ◽  
pp. 45
Author(s):  
Fadzilah Abdol Razak ◽  
Nor Rashidah ◽  
Norhayati Baharun ◽  
Noor Afni Deraman
Keyword(s):  
Hypothesis Testing ◽  
Regression Coefficient ◽  
Hypothesis Test ◽  
Regression Coefficients ◽  
Standard Format ◽  
Simple Hypothesis ◽  
Regression Slope ◽  
Correct Hypothesis ◽  
Definition Of

This study aims to investigate students’ ability to write a correct hypothesis based on the statement referring to regression coefficients.  Different statements of regression coefficients, specifically the slope were given in the standard format of test questions and the students were asked to conduct an appropriate hypothesis test. From the decision made, the students also had to provide suitable conclusions on each of the tests conducted. 197 answer scripts were inspected and the focus was given to the hypothesis statement and the conclusion provided by the students. The results indicated that students were able to write proper hypothesis statement for a regression coefficient that directly refers to the slope of the variable. However, they failed to provide correct hypothesis when they had to translate the definition of slope to an appropriate hypothesis statement. Despite their ability to write simple hypothesis for regression slope, they still had difficulties in providing conclusions for the tests conducted. The study also clearly revealed that even though some of the students managed to write proper conclusions, they did not correspond to the hypothesis statements given earlier, as the conclusions made were merely based on the question statement. 

scholarly journals Selective tweeting of COVID-19 articles: Does title or abstract positivity influence dissemination?

2021 ◽  
Author(s):  
Nicholas Fabiano ◽  
Zachary Hallgrimson ◽  
Stanley Wong ◽  
Jean-Paul Salameh ◽  
Sakib Kazi ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Open Access ◽  
Negative Binomial ◽  
Regression Coefficient ◽  
Negative Binomial Regression ◽  
Regression Coefficients ◽  
P Values ◽  
Confounding Variables ◽  
Binomial Regression ◽  
Likelihood Ratio Testing

Background: Previous research has shown that articles may be cited more frequently on the basis of title or abstract positivity. Whether a similar selective sharing practice exists on Twitter is not well understood. The objective of this study was to assess if COVID-19 articles with positive titles or abstracts were tweeted more frequently than those with non-positive titles or abstracts. Methods: COVID-19 related articles published between January 1st and April 14th, 2020 were extracted from the LitCovid database and all articles were screened for eligibility. Titles and abstracts were classified using a list of positive and negative words from a previous study. A negative binomial regression analysis controlling for confounding variables (2018 impact factor, open access status, continent of the corresponding author, and topic) was performed to obtain regression coefficients, with the p values obtained by likelihood ratio testing. Results: A total of 3752 COVID-19 articles were included. Of the included studies, 44 titles and 112 abstracts were positive; 1 title and 7 abstracts were negative; and 3707 titles and 627 abstracts were neutral. Articles with positive titles had a lower tweet rate relative to articles with non-positive titles, with a regression coefficient of -1.10 (P < .001), while the positivity of the abstract did not impact tweet rate (P = .2218). Conclusion: COVID-19 articles with non-positive titles are preferentially tweeted, while abstract positivity does not influence tweet rate.

The relationship between the crude-fibre content of pasture and other feeding-stuffs and their digestibility and starch equivalent

1949 ◽  
Vol 39 (3) ◽  
pp. 254-258 ◽  
Author(s):  
E. G. Hallsworth
Keyword(s):  
Regression Analysis ◽  
Regression Coefficient ◽  
Fibre Content ◽  
Regression Coefficients ◽  
Published Data ◽  
Crude Fibre ◽  
Wide Range ◽  
Significant Difference ◽  
The Relationship ◽  
Crude Fibre Content

A study of the published data for feeding-stuff composition, digestibility and starch equivalent has shown that a linear relationship exists between the crude-fibre content and digestibility, and between crude-fibre content and starch equivalent.No significant difference was found between the regression coefficients for crude fibre and digestibility for sheep and cattle, but the coefficients for horses and pigs were notably larger, and significantly so for pigs.For pasture herbage the relationship between protein and starch equivalent was found to be merely a reflexion of the fibre content, and the regression coefficient between them became non-significant when crude fibre was included in the regression analysis. An equation has been obtained connecting crude fibre with starch equivalent, which is valid over a wide range of pasture species and fibre contents.

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