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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### coefficient changes direction with interaction term entered

Hi I'm running a logistic regression and my first model tests the direct effects of a variable (X) which is initially negative. In the second model...

• Replies: 2
• Views: 7,303
06-13-2011, 08:47 PM
2. ### standardized parameters

Hello, can anyone help me with a brief explanation? Usually I use the "stb" model option while running the proc logistic in sas to calculate the...

• Replies: 0
• Views: 3,193
06-14-2011, 05:17 AM
3. ### In stepwise regression, can the number of predictors be >n?

Hi, I'm getting an error when I try to run a stepwise regression with backward elimination - it says there is not enough data in the columns. I...

• Replies: 7
• Views: 3,520
06-14-2011, 07:54 AM
4. ### Weird results

Hello, I ran a regression analysis, with 2 IV's. One is highly significant, and explain about 93% of the variance. The second is significant, but...

• Replies: 0
• Views: 1,517
06-15-2011, 02:31 AM
5. ### Simple regression question

Hi. I know most of my basic regression stuff but I forgot one thing. I conducted a regression with 4 independent variables and from my regression...

• Replies: 5
• Views: 2,606
06-15-2011, 08:06 AM
6. ### Z-test in NB regression model

what is the null hypothesis of z-test in negative binomial regression?

• Replies: 4
• Views: 3,498
06-15-2011, 10:54 AM
7. ### Interaction Term in Logistic Regression

I'm reading Kutner, et al., Applied Linear Statistical Models (5th), and came across something I don't recall the authors explaining. I vaguely...

• Replies: 8
• Views: 9,097
06-17-2011, 05:10 PM
8. ### Expectation/ Variance/ ACF and PACF in ARMA(2,1)

Hello guys, I hope I'm not posting in the wrong subforum. I am looking for a solution to calculate E, Var, and ACF and PACF coefficents in an...

• Replies: 1
• Views: 5,480
06-17-2011, 08:09 PM
9. ### Cross validation bandwith selection

Hi, is there a package in R for cross-validation optimal bandwith selection for nonaparemtric regression/autoregression functions estimation? (for...

• Replies: 1
• Views: 3,758
06-18-2011, 09:52 AM
10. ### Logistic regression - help needed

Hi, I want to predict a dependent variable from a set of (3) factor scores, as independent variables. The problem is that one of those scores...

• Replies: 2
• Views: 4,172
06-19-2011, 01:42 AM
11. ### Chi square and Wald chi square

What is the difference between wald chi square test and chi square test in regression analysis?

• Replies: 2
• Views: 20,964
06-20-2011, 01:26 PM
12. ### Help with Normalizing data

This is my first time posting to this forum, and Im hoping to get some help. I am an engineer, and I have been assigned a project where I need to...

• Replies: 2
• Views: 2,881
06-20-2011, 08:11 PM
13. ### OLS + Serial Correlation + Cochrane-Orcutt Procedure

Hi Forum Experts, I am working through a OLS regression analysis where there is positive serial correlation in the independent variable over time....

• Replies: 2
• Views: 7,389
06-20-2011, 08:37 PM
14. ### Best way to normalize a non linear trend.

Using a regression performed in Excel, I have data that can be described by the equation y = 4*(x^0.5). The x values range from 1000 to 5000. I...

• Replies: 2
• Views: 6,070
06-20-2011, 11:48 PM
15. ### Including beta coeffiicients in logistic regression

Dear all, I've posted the same query in the biostatistics section but as it is specific to logistic regression, I thought it a good idea to try...

• Replies: 2
• Views: 2,658
06-21-2011, 02:41 AM
16. ### Power calculation in regression for curviliear effect

Hi! I performed a regresson analysis to test a curvilinear effect. I've followed Aiken & West procedures Center X, Squared centered X ...

• Replies: 0
• Views: 1,604
06-21-2011, 05:00 AM
17. ### error structure

Could anyone please clarify what does "error structure distribution" in a regression model exactly refer to? I'm trying to relate "number of...

• Replies: 0
• Views: 2,598
06-21-2011, 09:51 AM
18. ### Non-linear multiregression analysis

Dear experts, Is anyone knows about non-linear multiregression analysis? Can anyone explain it to me the methods or etc. Is there any reference or...

• Replies: 0
• Views: 2,257
06-22-2011, 03:45 AM
19. ### Confusion over how to calculate regression coefficient

I'm trying to find the regression coefficient of one set of a data on another. There is a linear relationship between the two sets of data. After a...

• Replies: 6
• Views: 11,286
06-22-2011, 01:33 PM
20. ### Correlation between predictive variables in multiple regression

I have several response variables which are explained by many different explanatory variables. I have one value for each day for each variable, both...

• Replies: 1
• Views: 2,132
06-22-2011, 01:46 PM
21. ### A query related to Bayesian Regression

I had a query related to Bayesian Regression and I was wondering if someone had any ideas : So in the proper Bayesian case, we have the following...

• Replies: 0
• Views: 1,702
06-22-2011, 06:42 PM
22. ### Factorial design and regression

Hi All, I need some support on a regression needed for a factorial design. For sake of clarity I have to tell I am a dummy on statistical topic,...

• Replies: 0
• Views: 2,636
06-23-2011, 03:20 AM
23. ### Cross check the regression equation correctness

People, i have this problem From the following data obtain the two regression equations Sales 06 02 10 04 08 Purchase09 11 05 08 07 i...

• Replies: 0
• Views: 1,717
06-23-2011, 01:09 PM
24. ### Sample Size Calculation for Multiple Regression

Hi Everyone, I would like to apologize in advance for the question below, but my level of knowledge in statistics is mediocre at best. I am...

• Replies: 2
• Views: 3,632
06-23-2011, 02:38 PM
25. ### Sphericity

Hi! I'm Planning on running a simulation, and one of my conditions I'm varying is whether a set of variables Meet the sphericity assumption in a 1...

• Replies: 3
• Views: 2,714
06-24-2011, 11:59 AM

Dear All, I have a question here. when I put control my variable in my multiple regression in spss, why the result is the same as that of no...

• Replies: 2
• Views: 2,321
06-24-2011, 02:04 PM
27. ### Interpreting hree way interactions

I'm trying to interpret two significant three-way interactions. I've used hierarchical regression to analyse my data, and I have come up with two...

• Replies: 0
• Views: 2,261
06-25-2011, 01:14 AM
28. ### Transform data to Ln

I have a research and I use regression to analyze my data. first I input my datumn in spss and analyze those with regression. the result is all of...

• Replies: 0
• Views: 2,852
06-25-2011, 02:30 AM
29. ### Logarithmic regression in SPSS

Hi, does anyone know how to use non-linear logarithmic regression in SPSS? I have one DV and one IV. Thanks

• Replies: 0
• Views: 6,281
06-27-2011, 10:39 AM
30. ### I am getting very vey small p-values. Is it normal?

Hi. I am doing correlations and linear regressions and getting p-values as small as 2 E -40 Is it normal? and what does it mean? Thanks a lot.

• Replies: 1
• Views: 3,005
06-27-2011, 04:43 PM
31. ### obtaining β(hat)s from weighted least square regression

I'm doing Regression analysis under stratified random sampling for my research since it's usually assumed in many textbooks that the data is simple...

• Replies: 0
• Views: 60,992
06-27-2011, 11:06 PM
32. ### Collinearity help

I saw a suggestion on a web page for dealing with collinearity I had not seen before. http://www2.chass.ncsu.edu/garson/pa765/tacq.htm "Treat...

• Replies: 5
• Views: 5,910
06-28-2011, 07:51 AM
33. ### Coefficient of Determination

Hi there, I'm using non-linear regression (specially I'm using neural networks for time series prediction) and I'm a bit unsure about the...

• Replies: 2
• Views: 4,056
06-29-2011, 06:14 AM
34. ### Alternative to Hausman test? Fixed-/Random-Effects with robust SEs

Hi everyone! After reading loads and loads of material about tests, I have still not been able to come up with a satisfying solution to my probem....

• Replies: 0
• Views: 3,588
06-29-2011, 10:59 AM
35. ### interaction in logistic regression

Hi, I have run a moltinomial logistic regression and wanted to test for moderation effects of some variables so I tested the model with main effects...

• Replies: 10
• Views: 5,313
07-01-2011, 08:03 PM
36. ### Regression models with pre and post tests

I'd like to use a path analysis for N=37 with three exo. variables, i.e., R, M, S? I don't use a latent variable in my model, and wonder if the N>200...

• Replies: 0
• Views: 3,488
07-02-2011, 05:48 AM
37. ### which model to use ?

Hello Guys, I have a little problem that needs to be solved in statistical way. I have a sensor, that when comes in interaction with some gas,...

• Replies: 0
• Views: 1,489
07-03-2011, 04:02 AM
38. ### Can I compare models like this ?

Hi, I was trying to fit a linear regression model (simple), for a set of data that shows a very strong linear relation between X and Y. Linearity...

• Replies: 3
• Views: 1,856
07-05-2011, 01:46 AM
39. ### Categorical predictors in multiple regression

Hi, I have a question my thesis advisor cant help with. I'm trying to test the hypothesis that ambivalence towards eating meat is moderated by...

• Replies: 1
• Views: 2,057
07-05-2011, 06:35 PM
40. ### All possible sub-sets regression in SPSS

Hi there, I’d like to do an “all possible sub-sets” regression analysis in SPSS with six parameters to model my dependent vbl, but am not very savvy...

• Replies: 0
• Views: 2,891
07-06-2011, 01:43 PM
41. ### Co-efficient interpretation in Gamma Regression Model

Hi Guys, I am trying to fit a gamma regression model using a log link model. Now, I get a negative co-efficient for one of my IVs. What is the...

• Replies: 0
• Views: 3,508
07-06-2011, 01:49 PM
42. ### Poisson regression problem

I was doing a Poisson regression for my data. I got a bunch of 0 or 1 (response variable) data and I used GLM in R to fit the model. Then I found...

• Replies: 0
• Views: 1,978
07-08-2011, 10:08 PM
43. ### 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: 15,184
Laz
07-09-2011, 11:57 AM
44. ### Proportional DV (Sounding Board)

I'm working through a qualitative study around reading strategies that may gain some benifit through quantitative analysis. Set up: 9 teachers...

• Replies: 1
• Views: 1,840
07-11-2011, 11:40 AM
45. ### Surface Response Metodolgy: What model should i use for a 2 factor design

I made a SRM for a chemistry experiment. The factors analyzed were 2 an i had 5 responses. For the model can i use a cubic model or should i use a...

• Replies: 0
• Views: 2,235
07-11-2011, 02:11 PM
46. ### Find the affect of introducing a variable into a Data Set

Good morning, Everyone! I apologize, but I must admit that it's been a few years since I've been engaged in any statistical analysis; that being...

• Replies: 3
• Views: 3,131
07-11-2011, 08:21 PM
47. ### stepwise regression with dummy variables

Hello there, I want to do a stepwise regression in order to find relevant predicting variables, but one of the possible predicting variables is a...

• Replies: 6
• Views: 16,390
07-12-2011, 09:00 AM
48. ### Help with Regression Analysis

It's been a while since I've done a regression analysis. I'm trying to run a multivariate regression analysis in Excel to determine whether or not...

• Replies: 9
• Views: 4,305
07-12-2011, 04:34 PM
49. ### Poisson distribution - goodness of fit

I want to test goodness of fit for poisson distribution for a very large data set (~millions of records). Can anybody suggest a method? All the...

• Replies: 1
• Views: 2,946
BGM
07-13-2011, 04:20 AM
50. ### Penalty Analysis

Hi, how do we interpret the result of penalty analysis having negative mean drop (which is sig) as well as negative penalties (which is also sig)....

• Replies: 1
• Views: 6,937
07-13-2011, 09:16 PM
51. ### Moderated regression: correlation between moderator and predictor

Hi All, my data suggest a significant positive moderation that can be grounded on (somewhat ;)) strong theory. Everything looks fine...

• Replies: 0
• Views: 3,938
07-14-2011, 04:15 AM
52. ### Question: Sample size and regression

I have a question regarding sample size and regression. First, the following is a general overview of my study: Purpose of Study: To examine the...

• Replies: 0
• Views: 3,162
07-14-2011, 10:20 PM
53. ### Log-linear Regression Models with only the cell mean, variance, and sample size

Hi, I am working on a project with a contingency table with provide only the mean, variance, and sample size, but don't have the exact count of...

• Replies: 0
• Views: 2,061
07-15-2011, 01:10 AM
54. ### How to choose the best predictors when b and beta indicate different predictors.

Hey everyone, for my thesis I'm investigating the relationship that can exist between the emotion of boredom and interest through the analysis of...

• Replies: 1
• Views: 2,382
07-17-2011, 10:52 AM

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