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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Negative value of the constant term..?

Hi, My name is Roy Klaassen, currently writing my master thesis in the field of marketing management (Tilburg University, the Netherlands). My...

• Replies: 2
• Views: 4,603
10-31-2011, 08:10 AM
2. ### moderated multiple regression with dummy variables

Hello, As part of final revisions for my dissertation, I need to resolve an issue in my analyses. I am running a moderated multiple...

• Replies: 3
• Views: 4,598
07-18-2012, 07:11 PM
3. ### Power, Sample Size, Interactions ?

Hello Everyone BACKGROUND I am working on a psychology project. Initially, I was going to do two separate regressions for each ethnic group but...

• Replies: 2
• Views: 4,581
01-31-2011, 04:32 AM
4. ### Link function for proportional outcome

I have a data set where the outcome variable is percent passing (ELA and Math tests) for school districts. I will use a 2 level multilevel model...

• Replies: 24
• Views: 4,575
05-06-2014, 06:39 PM
5. ### Marginal effects after biprobit

Dear Colleagues, I run a biprobit regression and all variables are significant but I found that the sign of the independent variables changes...

• Replies: 0
• Views: 4,563
11-01-2010, 04:32 PM
6. ### three way interactions and centering in multiple regression

Hello, I am examining three variables to see whether they interact with each other to predict my DV using multiple regression. I typically center my...

• Replies: 4
• Views: 4,559
02-16-2009, 08:43 PM
7. ### GLM Parameter Estimation in R

Hello everyone! I was searching for GLM content, then I found this forum, so I thought you could help me :). I'm starting to study GLMs and I know...

• Replies: 0
• Views: 4,556
Kol
02-24-2011, 08:02 PM
8. ### Combining Model Scores

Question for the regression modeling experts: I am looking for an efficient and correct way to combine model scores taking into account...

• Replies: 0
• Views: 4,541
03-09-2011, 04:40 PM
9. ### Test for and remedy of multicollinearity in logistic regression with categorical IVs

I was searching over net how can I test the presence of multicollinearity and what is its remedy in case the IVs are categorical in a logistic...

• Replies: 2
• Views: 4,536
09-07-2012, 03:22 AM
10. ### Explain the nonsignificance of simple slope analysis (with significant interaction)?

Hi everyone, I need some help. In a study, I tested an interaction hypothesis and got a significant interaction result (p < .05) and visual...

• Replies: 4
• Views: 4,534
08-07-2013, 03:42 PM
11. ### Logistic regression analysis - Large beta coefficients

Hi, I have just run a logistic regression analysis on 7 IVs and a dichotomous DV. The IVs are regression-weighted composite scores of Likert scale...

• Replies: 3
• Views: 4,525
05-01-2012, 02:46 AM
12. ### Why a simple linear regression (OLS)

Hi! This forum is so helpful :tup: I just can't seem to find an answer to my question though. I am planning on doing a multiple regression...

• Replies: 18
• Views: 4,522
03-08-2017, 04:04 AM
13. ### Logistic regression failed to converge

For one of my data sets the model failed to converge. I am sure this is because I have to few data points for logistic regression (only 90 with about...

• Replies: 3
• Views: 4,515
02-12-2013, 09:16 PM
14. ### Hpw to Determine the Hypotheses for a T-test Study?

• Replies: 4
• Views: 4,511
11-29-2009, 12:04 AM

You have the ramp-servicing contract for a midsize car wash. For wash workers you use predominantly part time workers, all of whom have sufficient...

• Replies: 4
• Views: 4,508
09-09-2010, 03:49 PM
16. ### This simple linear regression isn't adding up..

Edit/Cliffnotes: CORRECTION- The second SSR formula in question is SSR = SUM((yhat(i) - ybar)^2), not SSR = SUM((y(i) - ybar)^2). Dragan resolved my...

• Replies: 2
• Views: 4,504
02-18-2009, 10:19 PM
17. ### Time series regression books

Hi, I am interested in Time series regression and I would like to find 1-2 good books that explain Time series with examples using SAS. Does...

• Replies: 4
• Views: 4,502
08-21-2013, 09:37 AM
18. ### stronger beta in multivariate than in univariate regression?

Hi, I have a problem interpretig univariate vs multivariate regression. I have a dependent variable and want to analyze what factors independently...

• Replies: 1
• Views: 4,494
10-31-2013, 08:04 AM
19. ### Regression for Positive and Negative Integers

My independent variable is a difference in count data. I was wondering if there was a specific regression that should be used for data that contains...

• Replies: 1
• Views: 4,492
10-29-2010, 10:30 AM
20. ### How to choose data for your regression

Hi guys, I'm developing a statistical method to analyse a player's performance in tennis (annotation). To do this I need to decide on certain...

• Replies: 16
• Views: 4,490
07-19-2013, 12:16 PM
21. ### Lagged independent variable (Stata)

Hello, I'm currently working with a company dataset in the form of an unbalanced panel (overall sample size: 1.300 company years, T: 10, X: ~170...

• Replies: 0
• Views: 4,488
04-23-2013, 03:55 AM
22. ### Impossible exam question!

I just got done taking an exam by an evil and cruel professor who likes to throw in problems that he's never discussed in class, never assigned for...

• Replies: 8
• Views: 4,477
04-29-2011, 11:00 PM
23. ### Linear Regression Models (2)

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

• Replies: 12
• Views: 4,467
05-22-2009, 03:35 PM
24. ### Forecasting assignment (Time series data)

Hi - I am new to this forum and hope to learn a thing or two from you experienced lads! I work at a companacy where we are looking into the...

• Replies: 1
• Views: 4,460
11-08-2010, 07:47 AM
25. ### Help Stats :( Interactions and Homoscedasticity

IF anyone could help with this right now would appreciate it so much - have tried looking it up anywhere and finding so many different...

• Replies: 1
• Views: 4,457
03-26-2008, 10:33 AM
26. ### multivariate multiple regression

Hello all: I'm working on a multivariate multiple regression analysis in SAS. I have 3 response variables and 2 independent variables. When...

• Replies: 0
• Views: 4,456
12-03-2009, 06:58 PM
27. ### Logistic regression. biological significance of a mathematical model quadratic term.

See if anybody can help me understand something, as I am a bit confused. It is regarding the biological significance of a mathematical model...

• Replies: 2
• Views: 4,448
10-11-2010, 07:15 AM
28. ### Standard error of coefficients for ols vs regression through the origin

Hi guys, Thought I'd throw this out there officially since I'm having some trouble. I'm under the current impression that if you set up a...

• Replies: 9
• Views: 4,447
01-12-2012, 08:05 PM
29. ### Multiple Regression, Collinearity Question

Hello All, I'm running a multiple regression on 8 predictors. A few of the predictors have positive correlations with the response, however their...

• Replies: 1
• Views: 4,440
06-15-2010, 06:55 PM
30. ### Chi square as sneak peek into logistic regression

Let's say I have these variables... Dependent var: cancelled_flag Independent vars: region, gender, etc My ultimate goal is to do a logistic...

• Replies: 1
• Views: 4,429
mud
12-05-2009, 08:23 PM
31. ### Manually calculating weights for WLS

*Posted in Stat Consulting but moved here b/c I think it's more fitting. Hi guys, I'm trying to figure out how to manually calculate the...

• Replies: 0
• Views: 4,426
01-13-2010, 03:21 PM
32. ### Comparing coefficients for nested logistic regressions

Hi, maybe one out there can help. I am interested in comparing the coefficients of two binary logistic models. In one nested in the other one,...

• Replies: 9
• Views: 4,422
11-24-2010, 08:45 AM
33. ### P Values on the Intercept

Hi, I have done a regressional analysis of a data set based on promotions to test the hypothesis that a specific qualification / specialisation...

• Replies: 2
• Views: 4,406
10-11-2011, 01:38 PM
34. ### effect size in hierarchical multiple regression (categorical predictor)

Hello all So glad to have found this useful forum and have already gotten some clarity on other issues related to the hierarchical regression...

• Replies: 0
• Views: 4,400
07-30-2008, 01:23 PM
35. ### Teaching multivariate statistics: text & software recommendations

Hello all, I'll be leading an introductory seminar to multivariate statistics in the spring and was looking for recommendations for texts that...

• Replies: 3
• Views: 4,388
12-08-2009, 09:54 AM
36. ### Degrees of Freedom in case of multiple regression?

What does dof of each predictor show in case of multiple regression? Instead of explaining mathematically, could anyone explain the physical...

• Replies: 3
• Views: 4,387
07-19-2010, 10:21 AM
37. ### advanced method to compare regression coefficient

Hello, I am regressing two butterfly richness variables (summer and winter) against a set of environmental variables separately. ...

• Replies: 5
• Views: 4,385
08-07-2010, 05:35 AM
38. ### Variable transformation in OLS regression

Hi there, I have a question related to the transformation of independent variables in an OLS regression. More specifically: When I transform...

• Replies: 7
• Views: 4,374
06-20-2016, 06:48 PM
39. ### Poisson GLM: data set use; influence of counts

Hello Regression form, I am after a explanation in layman's terms of what's going on behind the scenes with a couple of GLM analyses I'm doing. ...

• Replies: 0
• Views: 4,372
01-16-2011, 02:46 AM
40. ### How does correlation work?

Dear All, I am a beginner to statistics. I have a pretty basic question. If I have 2 variables X and Y, how does E produce a no which measures...

• Replies: 2
• Views: 4,364
08-28-2011, 11:03 PM
41. ### Where in the Regression Output tells me which are the strongest predictor variables?

Hi, I'm no statitician (yet), but I'm having a go!! - am looking to design an employee survey and analyse the data in Excel. I have watched many...

• Replies: 4
• Views: 4,362
03-25-2012, 01:03 PM
42. ### Repeated measures regression models in R using nlme (linear) and lme4 (logistic)

Hello, So, I'm still working on my thesis model, which I asked questions about last week or so. I went to stats help at my university, and have...

• Replies: 0
• Views: 4,362
09-16-2012, 03:04 PM
43. ### Use of p-values for Cox proportional hazards model.

I'm just reading what looks like quite a robust cohort study looking at patient survival after taking beta-blockers (a heart drug). The authors...

• Replies: 1
• Views: 4,361
BGM
06-05-2011, 04:37 PM
44. ### adjusting a proportion score (controling for age)

I have 20 yes/no ratings (did this product help you). People were able to rate as many of the 20 products as they used (on average people rated 5...

• Replies: 8
• Views: 4,358
12-15-2008, 11:23 PM
45. ### Number of IV's in multiple regressions: How many is 'too many'?

Hello I need to run a number of individual regressions and am trying to decide how to break them down. I was wondering whether there is a limit...

• Replies: 2
• Views: 4,352
09-02-2008, 03:51 PM
46. ### Ordinal Logistic Regression and Bimodality

Hello, I'm running ordinal logistic regressions with survey weights. I was under the impression that there are no distributional assumptions for...

• Replies: 0
• Views: 4,351
07-24-2009, 01:28 PM
47. ### Binomial regression with x as the dependent variable and n as an independent variable

Hi all I have a sample size of 100. Out of 100 a certain number are successful at stage one. Of those successful at stage one some are successful...

• Replies: 15
• Views: 4,348
03-08-2012, 05:59 PM
48. ### Sigmoid curve

Hi, Is it possible to linearise data for a sigmoid curve? To be clear, I do not mean a logistic function! The data are not between 0 and 1! I...

• Replies: 8
• Views: 4,347
06-12-2012, 04:39 PM
49. ### reporting descriptive Stats when using gender in multiple regression.

Hi, I am relatively new to research methods and using SPSS. I wanted to perform multiple regression analysis using categorical and continuous...

• Replies: 6
• Views: 4,346
07-19-2012, 02:39 PM
50. ### Fit a non-recatngular parabola in R

Hello, I'd like to fit the formula below to a non-rectangular parabola in R. C = (XI+A-√((ϕI+A )^2-4XϕIA))/2X-R I have several data points...

• Replies: 0
• Views: 4,329
09-08-2011, 10:01 PM
51. ### Regression in excel - Is this possible?

Hi guys. Okay for my regression project, I have all my data and my Y value is based on 7 variables (i.e. Y = b0 +b1x1 +...+ b7x7) Now i have...

• Replies: 5
• Views: 4,326
12-11-2010, 01:59 PM
52. ### can you extrapolate a moving average WAy into the future????

Hi, I have monthly sales data. I have been asked to do a time series moving average??? If I do a 2 month moving average I can only predict...

• Replies: 3
• Views: 4,324
01-10-2013, 05:34 PM
53. ### regression on age groups

Dear All, I have the following question: Estimate a simple regression model of ‘libertarian-authoritarian’ attitude as a function of age groups...

• Replies: 5
• Views: 4,324
11-17-2015, 06:37 PM
54. ### Simple Linear Regression with GUM Uncertainties

I would appreciate it if someone could suggest some references that discuss how to formally incorporate measurement uncertainties (as calculated per...

• Replies: 0
• Views: 4,319
07-23-2009, 04:31 PM

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