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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Logistic regression - behavior of uncorrelated predictors

Hi all, I am a bit puzzled about the behavior of uncorrelated predictors in logistic regression. As in OLS, I thought that if two predictors (X1...

• Replies: 1
• Views: 1,426
07-03-2012, 02:35 PM
2. ### Error propagation for non-linear regression parameters

Hi, I've been doing non-linear regression on some datasets using R. The regression outputs parameter estimation and parameter standard error (SE)...

• Replies: 0
• Views: 2,369
07-03-2012, 10:46 AM
3. ### Restricted cubic splines with dichotomous outcome

Do anyone know if it's possible to perform a regression using restricted cubic splies with a dichotomous outcome?

• Replies: 1
• Views: 3,269
07-03-2012, 09:57 AM
4. ### One dependent variable contingent upon another

I am running two separate regression analyses where I have the same set of independent variables but in one case the dependent variable (DV1) is a...

• Replies: 1
• Views: 2,083
06-29-2012, 12:50 PM
5. ### ANOVA REML AND REGRESSION - When to use

Dear All I am trying to get my head around when to use ANOVA when to use regeression and when to use REML. As I understand REML can be used in...

• Replies: 1
• Views: 3,068
06-29-2012, 12:24 PM
6. ### Box-Tidwell procedure

Hello everyone, Is there a possibility to perform Box-Tidwell procedure in SPSS, or any other convenient software? Thanks.

• Replies: 0
• Views: 5,595
06-28-2012, 04:38 PM
7. ### T-Test vs. Welch

So, I know very little about statistics and hope you could help me. I understand that I should run a t-test when variances are similar. And a...

• Replies: 0
• Views: 2,506
06-28-2012, 09:21 AM
8. ### Multiple Linear Regression: Transformation, testing of normality, heteroscedasticity

Hello everyone, I have a question that might be a basic one, but still I want to reassure myself that I am not on the wrong path by hearing the...

• Replies: 6
• Views: 4,906
06-28-2012, 09:18 AM
9. ### Intepretation of intercept in repeated-measures regression model

Hello, According to my understanding, in linear regression if there's an interaction including continuous predictors then the intercept is not...

• Replies: 3
• Views: 3,121
06-28-2012, 08:18 AM
10. ### Help with multiple regression analyses for attachment data

Hi all, Would appreciate it if anyone could direct me with some really helpful info with regard to the subject matter. I've a dataset of ECR data...

• Replies: 0
• Views: 1,572
06-26-2012, 02:51 AM
11. ### Best analysis to use.

Hi - I am new to using Stats and wanted to know if regression would work in the below scenario. I have two sets of hotel occupancy rates by...

• Replies: 4
• Views: 1,975
06-25-2012, 08:03 PM
12. ### Fixed effects (FE) vs. Generalized Equations Estimation (GEE)

Friends, let me quickly give you the context of my question first: I am analyzing an unbalanced panel of 200 companies across 4 years. My research...

• Replies: 1
• Views: 4,992
06-25-2012, 04:50 PM
13. ### Linear regression, probably simple...

Hello group, first post, this has also been posted in the "Statistics" forum: I have one physiological outcome variable and 3 independent...

• Replies: 2
• Views: 2,387
06-25-2012, 12:31 PM
14. ### Leave one out cross validation

Hello I need to write down the disadvantages of the leave one out cross validation method when using small samples, and I need a little assistance...

• Replies: 0
• Views: 2,130
06-24-2012, 08:24 AM
15. ### how to understand fixed effects vs. random effects?

hello, all I have had a hard time trying to understand the concepts of fixed effects and random effects. I have googled a lot for help, but still...

• Replies: 0
• Views: 1,572
06-23-2012, 09:02 PM
16. ### Can stepwise regression be conducted nonparametrically?

Hi, I have some data that has shown significance with some variables using SAS mm estimator nonparametric regression, whereas the log transformed...

• Replies: 0
• Views: 1,127
06-23-2012, 02:05 PM
17. ### Pooled cross sectional data: How to test for and handle autocorrelation?

Hi, 1) My goal: I am making a difference-in-difference analysis to estimate the development in political efficacy for a certain group of people...

• Replies: 0
• Views: 4,223
06-23-2012, 09:50 AM
18. ### Critique my endogeneity proof.

solved solved

• Replies: 0
• Views: 1,793
06-23-2012, 07:03 AM
19. ### autocorrelation test?

should i perform an autocorrelation test such as DW test to a cross-sectional data? what actually autocorrelation means for cross-sectional data?...

• Replies: 0
• Views: 1,312
06-23-2012, 02:52 AM
20. ### Why is there endogeneity in this specification?

• Replies: 1
• Views: 1,598
06-22-2012, 09:26 AM
21. ### Interpreting log-linear coefficients

Hi there, I am fairly new to regression and have been set the task of modelling a data set in the form ln(y) = bx1 +bx2 +bx3 +bx4 +bx5 + e. In...

• Replies: 3
• Views: 5,956
06-22-2012, 04:19 AM
22. ### variance for multiple regression model

studying for a test.. any help appreciated.. Consider the multiple regression model Y = Xβ + ϵ, where X is n x (k+1) matrix, β is a vector of...

• Replies: 5
• Views: 7,793
06-22-2012, 03:47 AM
23. ### interpretation of principal component regression results

Hello, I have a question about the interpretation of individual variables using a PCA regression method. And because PCR requires a different...

• Replies: 0
• Views: 2,531
06-22-2012, 03:29 AM
24. ### Combining the effect of the linear and the Quadratic terms in Regression

Hi all, I am running a poisson regression model where I have linear term and quadratic term of time as predictors. When both are significant, can...

• Replies: 5
• Views: 2,656
06-21-2012, 11:17 AM
25. ### Poisson Rate Regression: Offset?

Hi! I'm comparing two groups on the # of hospitalizations they have in a 5 year period. Length of hospitalization stay is highly variable. For...

• Replies: 3
• Views: 3,363
06-21-2012, 07:11 AM
26. ### Multipel linear regression or Anova?

I am in the middle of a written exam where I have to examine a causal claim controlling for gender, age and occupation. The dependent variable is...

• Replies: 1
• Views: 1,221
06-20-2012, 02:46 PM
27. ### Regression problems based on glm repeated measures and multicollinearity

Hello, I am conducting a thesis in which I study the relationship of 3 independent variables to 1 dependent. In addition, I use 3 metric control...

• Replies: 0
• Views: 1,510
06-19-2012, 01:59 PM
28. ### Regression - OLS and GLS

• Replies: 1
• Views: 1,968
06-19-2012, 10:55 AM
29. ### For the love of God please click on this and help me - REML mixed models

I am doing a behavioural masters (due in a week). Basically there are about 20 behaviours which are recorded over 15 mins (900 seconds) and these are...

• Replies: 0
• Views: 703
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06-19-2012, 03:45 AM
30. ### Linear regression?????

Can I still treat my regression as being linear if one of the independent variables is a dummy with 3 categories or does it become an...

• Replies: 0
• Views: 1,305
06-17-2012, 07:27 AM
31. ### WLS Regression Weights

I am working on a problem for which I need to do a multiple regression that involves a dependent variable and two independent variables. The...

• Replies: 0
• Views: 3,322
06-16-2012, 02:08 PM
32. ### Regression with sqrt transformed dependent variable - meaning of the model's B value?

Hi fellow nerds :) My dependent variable had to be transformed by square root (so the residual plot would be normal). I usually use log10...

• Replies: 3
• Views: 10,546
06-16-2012, 12:28 PM
33. ### Linear regression: multiple independents?

Hello all you nice people! It's been such a long time since I used SPSS, but I now I have to analyse my data and I have very little time so I'm a...

• Replies: 0
• Views: 1,539
06-16-2012, 07:26 AM
34. ### Vuong test

Dear, I am trying to perform a Vuong-test to compare a Two-Step Heckman approach to a Double Hurdle approach. The paper of Humphreys...

• Replies: 0
• Views: 4,711
06-16-2012, 04:46 AM
35. ### interaction testing with sample

Hi, I have a question regarding my multiple regression analyses. I have a very small sample (30) so i can not include too many Independent...

• Replies: 1
• Views: 1,717
06-15-2012, 07:17 AM
36. ### probit regression with skewed data set

Hi, I have data from a household survey done in urban and rural areas. The sample size was not the same for both areas. if I combine both data...

• Replies: 1
• Views: 4,030
06-14-2012, 04:40 PM
37. ### Hierarchical regression with dummy variables

Hi, I need to perform hierarchical regression with dummy variables. I also need to check moderation by introducing in the model interactions of...

• Replies: 0
• Views: 1,770
06-14-2012, 01:32 PM
38. ### Proportion of Variance?

Hey guys, I'm helping my child out with their statistics homework and we cannot figure out these problems. Is there any chance that someone could...

• Replies: 0
• Views: 2,026
06-13-2012, 08:17 PM
39. ### 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: 4,353
06-12-2012, 04:39 PM
40. ### Logisitic regression with ranked independent variables

Hi all, This is my first post, so be gentle. I have the following type of data: ----------------------------- Data Set-1 DV......

• Replies: 0
• Views: 2,392
06-12-2012, 04:36 PM
41. ### Multiple regression, interaction, small sample

Hi, I have a question regarding my multiple regression analyses. I have a very small sample (30) so i can not include too many Independent...

• Replies: 0
• Views: 1,077
06-12-2012, 07:32 AM
42. ### Using Weight Of Evidence (WOE) in scoring

Hi, I'm a newcomer to scorecards and I am trying to build one by performing univariate analysis to test for predictive strength of each of my...

• Replies: 0
• Views: 3,302
06-12-2012, 07:04 AM
43. ### Logistic Regression: Include constant in the model or not?

Hi! 1. Could anybody give me a detailed explanation about why is inappropriate not to use a constant in a logistic regression model? Could you...

• Replies: 5
• Views: 13,102
06-12-2012, 06:08 AM
44. ### [R] How to calculate Confidence Interval for a prediction using Partial Regression?

Dear all, I have two highly correlated variables (y and x), and both of them depend on a third variable (A, for Area). Multiple regression...

• Replies: 0
• Views: 1,665
06-11-2012, 06:15 PM
45. ### Logistic regression as a purchase predictor - purchases per variable?

I've been using logistic regression on a web log data set to predict likelihood to purchase for each customer. I have a number of variables for each...

• Replies: 1
• Views: 1,718
06-11-2012, 05:29 PM
46. ### LME in SPSS and R giving different results

I am trying to do a linear mixed model in both SPSS and R ... well, more precisely, originally I did it in SPSS, but now I want to use resampling to...

• Replies: 6
• Views: 5,361
06-11-2012, 04:31 PM
47. ### Continuous Moderator and DV and categorical IV (dummy coded) Help please!!!

I ran an experiment recently and now I'm trying to work out whether either of the covariates (anxiety or avoidance) interact with the effect of any...

• Replies: 1
• Views: 4,286
06-11-2012, 03:28 PM
48. ### Multiple imputation for missing data or not????

Dear all, I am doing multivariate logistic regression analysis. Among the 8 independant variables, I have 2 with a lot of missing data (around 20%...

• Replies: 2
• Views: 1,666
06-11-2012, 09:39 AM
49. ### Validation of logistic regression algorithm

Hi, I'm new in machine learning and logistic regression area, and in MATLAB area, too. I'm doing logistic regression in machine learning. Until...

• Replies: 0
• Views: 1,073
06-11-2012, 03:53 AM
50. ### Refining a structural equation model

I am wondering if someone can please help me. I am completing some structural equation modeling with 400 complete cases (within the model there...

• Replies: 0
• Views: 917
06-11-2012, 01:47 AM
51. ### Formerly non-significant main effect becomes significant after interaction is entered

Hi there, I'm running a hierarchical regression with 3 IVs. First step: main effects, second step: two-ways, third step: three-ways. In the first...

• Replies: 0
• Views: 1,720
rsk
06-10-2012, 03:32 PM

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: 2,132
06-10-2012, 02:17 PM
53. ### Comparing betas between two separate models

I have a linear regression model and results for 2001, and 2008. A particular predictor (unemployment rate) is significant in both models (p=0.000)....

• Replies: 1
• Views: 1,569
06-10-2012, 04:33 AM
54. ### Expressing the sum of squared residuals as a matrix

R, the n by 1 matrix of residuals, is given by y_i, an n by 1 matrix, minus X, an n by 2 matrix consisting of explanatory variables x_1 and x_2(where...

• Replies: 2
• Views: 3,768
06-09-2012, 09:24 PM
55. ### Multiple regression and correlation matrix

Hi. I got some data I am about to present in a report. At first I created a correlation matrix, and there was no statistical significant...

• Replies: 2
• Views: 3,449
06-09-2012, 09:17 PM
56. ### Imputing missing values, and simulating the dependent variable in a regression

Hi all, I've been working on filling in some missing income values in a data set using multiple imputation. To check the validity of my model, I...

• Replies: 0
• Views: 2,588
06-08-2012, 05:08 PM
57. ### Simple question regarding the OLS procedure...

If I understand this equation correctly, if the transpose of x_i is an n by 2 matrix, then is the matrix x_i a 2 by n matrix? But isn't that a weird...

• Replies: 4
• Views: 1,725
06-06-2012, 11:43 AM
58. ### cohort regression analysis?

Is a multiple regression analysis a good test for cohort or even nested cohort? Dependent variable is LDL cholesterol binomial YES?NO? for LDL 240 or...

• Replies: 0
• Views: 1,464
06-06-2012, 11:24 AM

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