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Dason ‎(Devorador de queso)
05-10-2017
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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### test of non-linearity

I am reading an interesting econometric book where the author suggests testing if non-linearity exist by specifying a quadratic term, if its...

• Replies: 15
• Views: 7,498
06-30-2016, 02:24 PM
2. ### Multiple linear regression: What to do if I have a low Durbin-Watson value?

I am investigating to what extent do Temperature, Rainfall, GDP per capita, Population, Livestock and Arable Land (IVs) predict Food Calories...

• Replies: 15
• Views: 2,702
03-13-2017, 10:41 AM
3. ### How to choose best robust regression model?

Hello. There are several robust regression methods like LAR-(aka LAV-, LAD-, L1-Norm-)Regression, Quantil-Regression, M-Estimator, ... They are...

• Replies: 15
• Views: 4,062
03-21-2017, 02:05 PM
4. ### Standard error of multiple regression coefficients

I was revising my undergraduate courses of Statistics which I took before 20 years. I was exercising how to construct ANOVA table for a regression...

• Replies: 14
• Views: 34,312
12-11-2009, 07:49 PM
5. ### Interpreting regression coefficients (transformed)

Hello, I ran a GLM (poisson) analysis and have a list of my coefficients with their SEs. I need help interpreting the betas because the predictor...

• Replies: 14
• Views: 21,989
10-20-2011, 01:33 AM
6. ### Need help urgently

I need to run a test to run if a relationship is significant. Hyphothesis H1: Entertainment of the advertisement on web is positively associated...

• Replies: 14
• Views: 5,256
09-03-2010, 01:35 PM
7. ### Regression Rookie Seeks Help

Hi I have some data that i have been trying to use regression on. I have done individual regression analysis on Minitab 16 but was wondering is...

• Replies: 14
• Views: 2,437
02-10-2012, 10:16 AM
8. ### Parameter estimation - which method?

I am new to parameter estimation. It is not clear for me which method is the best to use to estimate parameter of my model: my statistical model has...

• Replies: 14
• Views: 4,122
07-18-2012, 04:06 AM
9. ### Odds ratio of 1 for bivariate logistic regression

My wonderous memory is that an odds ratio near 1 is not remotely substantively important, much like a zero slope would be in OLS. But I have a highly...

• Replies: 14
• Views: 7,093
07-19-2014, 02:51 PM
10. ### Relationship between Pearson correlation and variance in regression model

If the correlation between X and Y, say, is 0.5, then the standard deviation of the differences between the Y values and their predicted values on...

• Replies: 14
• Views: 8,020
08-12-2012, 11:33 PM
11. ### Can I use multivariate analysis without univariate analysis?

Dear all, I have a problem in my data analysis and paper writing. Some variables (dependents) were not statistically significantly correlated...

• Replies: 14
• Views: 23,531
01-26-2016, 11:08 AM
12. ### Stepwise and all-possible-regressions

Hi all, Before I start I just wanted to cordially thank you all for this great community...I really admire the work you have done...and the...

• Replies: 14
• Views: 5,427
01-29-2013, 12:19 AM
13. ### Univariate Logistic Regression - how to performe

Hello, I wonder how to perform Univariate Logistic Regression analysis in SPSS. Tested variables are dichotomized and predictors are ordinal and...

• Replies: 14
• Views: 15,712
12-29-2013, 02:19 PM
14. ### Categorical dependent variables / ANOVA

Hi all! Newbie here. In my current work role, I'm thought of as an expert on stats. This is totally untrue - but it doesn't take much to be seen...

• Replies: 14
• Views: 2,886
03-10-2014, 09:27 AM
15. ### Comparing coefficients in Logistic Regression

Hello ! I would like to have guidance on what follows. I was fitting a Logistic Regression model, and I got the coefficients for the model's...

• Replies: 14
• Views: 8,884
06-02-2015, 09:08 AM
16. ### Discretization of a continuous variable

He guys, I'm analyzing a research regarding patients and their risk factors for developing a certain side effect. If i enter age as a continous...

• Replies: 14
• Views: 3,255
03-28-2015, 09:53 AM
17. ### regression of car accidents vs age (question about normality and implement gender)

a few basic questions. I'm just starting to learn regression so I'm trying to apply what I'm learning. I have a set of data with ages ranging...

• Replies: 14
• Views: 2,716
03-09-2016, 05:11 PM
18. ### Type 1 error in regression with entire populations

I have read that you are not supposed to keep choosing different levels of the categorical variable to be the reference level, because this can cause...

• Replies: 14
• Views: 2,918
10-15-2016, 10:50 AM
19. ### Data scattered around y=x

Hello everyone, I am a researcher in engineering. I do have some background on statistics and mathematics in general, but I am not a professional...

• Replies: 14
• Views: 1,490
04-25-2017, 08:15 PM
20. ### R^2 vs AIC paradox?

Hi Everyone, I have the following situation which has me a bit puzzled. I've fitted two different linear models to a data set and would like to...

• Replies: 13
• Views: 16,099
04-07-2011, 11:10 PM
21. ### Gauss Elimination

Hi guys. Im being asked to program Gauss Elimination in R .Im new using this kind of program. It's simple but i don't know how to start. can someone...

• Replies: 13
• Views: 7,998
06-09-2011, 10:25 AM
22. ### Logistic Regression and Multiple Regression

Hi, Please could you help me (or direct me to someone who can help me) with the following: I have a spreadsheet with a number of...

• Replies: 13
• Views: 3,871
09-07-2011, 10:17 AM
23. ### Logistic regression

What does it mean when I have insignificant Wald test for all my predictor variables in the (Variables in the Equation) table, although the goodness...

• Replies: 13
• Views: 3,434
11-02-2011, 01:36 PM
24. ### Linear Model Prediction

I'm working on a linear model that looks like: Price = B0 + B1(Gender) + B2(Age) + B3(Credit Type) + B4(Home) ... The predictior is price, and...

• Replies: 13
• Views: 3,270
12-21-2011, 11:06 AM
25. ### Regression Help! to predict performance using the output of questionaire

Hi All, Somebody pl. helpe me in the brlow case, As a part of academic project, im intrested in measuring performance of purchase dpeartment in a...

• Replies: 13
• Views: 3,000
02-28-2012, 01:12 AM
26. ### To Classify Or Not -- Does it make sense to use income brackets?

At my job we're doing an analysis of energy usage for low income households as part of our subsidy program. Some 90,000 households are in this...

• Replies: 13
• Views: 3,211
09-11-2012, 10:10 AM
27. ### Comparing logistic regression nested models

I put this here rather than the SAS board, because I am not sure what I am saying about this test is correct. I have run across comments that you...

• Replies: 13
• Views: 6,653
04-29-2013, 03:51 PM
28. ### R squared change test for logistic regression

Some call this F change tests other hieararchical regression (not to be confused with multilevel regression which is also called that by some). It...

• Replies: 13
• Views: 10,480
01-08-2013, 06:17 PM
29. ### Interpreting interaction between dummy IV and continuous moderator with log DV

Hello Community, I urgently need your help to read the results of my regression analysis for my master thesis, which I need to hand in next week....

• Replies: 13
• Views: 3,286
08-02-2013, 09:18 AM
30. ### Spunky's idea of Weighted Least Squares

hey! sorry for the late post. i didn't end up coming back yesterday until late at night (as usual, lol) but i really wish to clarify whatever...

• Replies: 13
• Views: 2,821
11-01-2013, 11:37 AM
31. ### beta = r, so can beta be greater than 1.0?

I have a basic question, but it's been a long time since I learned regression. I'm having trouble reconciling these three facts: (1) In a...

• Replies: 13
• Views: 4,135
11-14-2013, 01:15 AM
32. ### Reviewer questioning my regression in my article, need advice on how/what to respond

Hi guys. I’ve submitted my first article and a reviewer is questioning my stats. I never had this problem before and I need your help! Quick...

• Replies: 13
• Views: 1,889
07-20-2015, 10:46 AM
33. ### chemical analysis

Hi guys help me? I have a problem. I have to analyze a product just finished the processing (hot) and subsequently when it is cooled to room...

• Replies: 13
• Views: 1,997
03-10-2016, 11:56 AM
34. ### Regression with Continuous and Dummy Independent Variables

Dear Colleagues, I am running a multivariate linear regression analysis but got stuck with this situation. I have one dependent variable (which...

• Replies: 13
• Views: 1,588
04-05-2017, 04:07 PM
35. ### Logistic regression - a very simple question

I have a question regarding the likelihood. I am trying to assess the likelihood of being in a family history positive group (FH+) on alcoholism (0...

• Replies: 13
• Views: 766
09-13-2017, 06:03 PM
36. ### backwards stepwise multiple regression, collinearity. Rejected paper.

Hi helpful people! My research paper was recently rejected and some of the feedback I received was in relation to the statistical tests done/not...

• Replies: 13
• Views: 535
09-06-2017, 05:53 PM
37. ### combining error terms for two dissimilar regressions

I have a linear regression for Y on X, and a power regression for Z on Y, each having associated error. (the Y values are different (independent) in...

• Replies: 13
• Views: 436
09-25-2017, 02:36 PM
38. ### Linear Regression Models (2)

β ε note: also under discussion in "Math Help Forum"

• Replies: 12
• Views: 4,454
05-22-2009, 03:35 PM
39. ### Best laid plans...

My thesis design was to give participants 2 tests. One measures a personal "type" and the other asks "opinions". My manipulation was to reverse...

• Replies: 12
• Views: 3,548
06-24-2009, 04:04 PM
40. ### Multicollinearity and AIC in stepwise regression

I am trying to run a stepwise regression with backward elimination on a set of water chemistry data in which there's a high degree of...

• Replies: 12
• Views: 15,095
Laz
07-09-2011, 11:57 AM
41. ### Any software to get sample size/power analysis for probit regression?

Hi All, I need to figure out sample size for an upcoming study that will utilize a probit regression to test agreement of a new diagnostic test to...

• Replies: 12
• Views: 7,955
09-19-2011, 12:06 PM
42. ### back-transformation of logit-transformed behavioral data

Hello, I am posting with hopes that someone can assist me in making sure that I am back-transforming my data correctly. I have behavioral data...

• Replies: 12
• Views: 14,077
01-31-2012, 02:15 AM
43. ### comparing regression coefficients from the same model

Hi, I think this question has been answered in bits and pieces here and there, but I am still a bit unsure about what the best approach for this is:...

• Replies: 12
• Views: 12,627
02-16-2012, 12:47 PM
44. ### Is R squared number valid when forcing a slope on regression fit line?

When I plot my log transformed data and do a regression fit, I get a slope of 3.37 and a r-squared of 0.96. My professor wants me to "force" a slope...

• Replies: 12
• Views: 5,958
02-16-2012, 02:06 PM
45. ### Simple regerssion

I am new to stats and this may be very easy for Seniors. In my regression analysis I want to find, how “% change” is affected by other variables, the...

• Replies: 12
• Views: 2,126
06-10-2012, 02:17 PM
46. ### Regression Analysis and Hypothesis Testing

Can someone please help me out with these questions. Thanks guys. Yhat = 227.3642 + 6.4075Xt Σ (Xt - Xbar)^2 = ΣXt^2 ≈33.43 σˆ2≈35.4198 Xbar =...

• Replies: 12
• Views: 3,955
02-15-2013, 03:46 PM

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