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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Logistic Regression: Testing for interaction effects with many covariates

Hello everyone! As topic states, I am running a logistic regression with quite a lot of independent variables (23). There are a lot more candidate...

• Replies: 3
• Views: 9,858
01-20-2012, 01:01 PM
2. ### Relationship between correlation matrix and R square

Hi there! I wonder if R-squared can be deemed a function of the correlation matrix (or the variance-covariance matrix)? The only ways to compute...

• Replies: 2
• Views: 7,031
01-22-2012, 09:54 AM
3. ### Report Interaction Term Coefficients, SE, t, p, as well as the interaction?

A bit of a basic question: I ran regression analyses to test moderating effects of gender and stress on anxiety. So, DV: Anxiety. IVs:...

• Replies: 4
• Views: 3,492
01-23-2012, 05:01 AM
4. ### Polynomial Regression interpretation

I have 2 questions that I need help interpreting: 1. Y = 47.31051 + 1.06914(X) - .01383(X^2) Because X is used twice (and one of them is a...

• Replies: 2
• Views: 13,419
01-23-2012, 12:16 PM
5. ### IV probit and Ivreg

Hello, When I use ivreg in Stata and cluster standard errors my results show that the independent variable is significant. However, when I use...

• Replies: 0
• Views: 4,058
01-23-2012, 02:31 PM
6. ### non zero mean gaussian error in least squares

Dear all, I have the classic Least squares problem Ax=b, but with Gaussian noise at both A and b. I found out that total least squares can be...

• Replies: 0
• Views: 3,116
01-25-2012, 11:29 AM
7. ### Converting Group Centroids into Original Measurement Units in DFA

I used SPSS to perform a discriminant function analysis on leg length which I am using to differentiate males and females in my sample. New measures...

• Replies: 2
• Views: 2,070
01-25-2012, 12:54 PM
8. ### Collinearity Among Categorical Variables in Regression

Does anyone have any knowledge and/or experience in how to measure collinearity between categorical variables that have more than 2 categories in the...

• Replies: 6
• Views: 34,839
01-25-2012, 03:52 PM
9. ### multinomial logit, marginal effects all insignificant!

Dear users, I am estimating a multinomial logit model. Concerning my coefficients, I find some variables being significant. After estimating the...

• Replies: 1
• Views: 5,319
01-25-2012, 04:49 PM
10. ### Multi linear regression

Hello everyone, I am new here (and to stats in general). Anyway I am working on a project where I want to predict the value of an outcome and I...

• Replies: 7
• Views: 2,926
01-26-2012, 12:57 PM
11. ### Reason for Higher Correlation weight Being Non-Significant

Hi everyone, I ran a multilevel model using proc mixed. I obtained the following results. I ran a single regression using two scales as...

• Replies: 0
• Views: 968
01-26-2012, 03:24 PM
12. ### difference between 2x2-table and binary logistic regression

Hello, I have to find out what is the (conceptual) difference between the tests. I don't really know what my means. I know they ARE different, but...

• Replies: 4
• Views: 3,416
01-27-2012, 01:54 PM
13. ### Strategies for improving homogeneity

OK, it has been a long time (like 25 years) since I have done much regression work and could use some suggestions. I know what a residual plot...

• Replies: 2
• Views: 1,436
01-28-2012, 01:03 PM
14. ### Question: Time-Series-Cross-Section Data

My data: Number of units: 290. Number of years: 4. The units are not sampled. Analysis technique I was thinking of doing an ordinary least...

• Replies: 3
• Views: 4,100
01-30-2012, 06:43 AM
15. ### Need help on ( unadjusted and adjusted w / 95% cl) odds ratio

I am doing Logistic regression on spss. My dependent variable is test result (+ or -) independent variables are Age and Gender (M,F). How can i get...

• Replies: 1
• Views: 6,625
01-30-2012, 01:26 PM
16. ### 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: 14,141
01-31-2012, 02:15 AM
17. ### weighted left-censored regression

Hello, does anyone know how to do "weighted left-censored regression" of data to the lognormal distribution in R/Matlab? Thanks

• Replies: 0
• Views: 2,529
01-31-2012, 08:25 AM
18. ### Use of regression models with centered variables

Hi all, I'm a little confused about how to use a regression model with centered variables. I know how centering variables works for reducing...

• Replies: 6
• Views: 9,242
02-01-2012, 12:23 AM
19. ### Significant regression coefficient vs. significant overall model

Hi everyone, I have rather a simple question but for some reason have not been able to find a clear answer. My apologies if I have missed a...

• Replies: 2
• Views: 8,017
02-02-2012, 08:51 AM
20. ### Non-Significant Categorical Predictor in Logistic Regression

hi: In the logistic regression modeling one of my predictor is categorical with 4 categories. We use 3 categories considering one as reference...

• Replies: 2
• Views: 4,238
02-02-2012, 10:25 AM
21. ### [SOLVED] How to interpret negative regression estimate?

Hi, I’m learning about regression analysis and have negative estimates for the grade-point average variable in two categories of a multinomial...

• Replies: 10
• Views: 4,786
02-03-2012, 03:10 AM
22. ### Logistic regression residual diagnostics

Hi, I am currently performing some logistic regression analysis and struggle with my residual diagnostics. I'm using glmfit in matlab and i get the...

• Replies: 0
• Views: 2,556
02-03-2012, 05:08 AM
23. ### testing whether the role of a predictor differs between two dependent variables

I have some questions about an analysis I am running. Sorry if they are very basic questions or completely off-course, but some help would be greatly...

• Replies: 7
• Views: 2,156
02-03-2012, 10:23 AM
24. ### [REGRESSION - REPEATED MEASURES] testing interactions with criterion scaling

Hello everyone, I have a question about the criterion scaling method of analysing repeated-measures designs (Pedhazur, 1977). As far as I...

• Replies: 0
• Views: 1,831
02-03-2012, 11:11 AM
25. ### Question about Regression and relationship testing

Hello, I am working on a project that is trying to look a possible correlation between BMI and various outcomes in a patient group. So the BMI...

• Replies: 5
• Views: 2,423
02-03-2012, 01:04 PM
26. ### Linear model accounting for fixed effects vs. ordered probit

I originally ran an ordered probit model on an ordinal dependent variable (values 1-12), however in order to account for fixed effects in my analysis...

• Replies: 3
• Views: 3,813
02-05-2012, 01:44 PM
27. ### Random Regression Analysis

I posted this in the R forum, which was the incorrect place to put this I think. I have a set of data that includes: 15 repeated measures for...

• Replies: 0
• Views: 2,970
02-06-2012, 02:09 PM
28. ### Geographically Weighted Regression

Hi, I am working on a project that aims to find any relationships between respiratory health with different environmental variables. I am...

• Replies: 1
• Views: 1,335
02-07-2012, 07:28 AM
29. ### Centering IVs for checking interaction effects in regression analysis

Attention: I have just skimmed an article (Echambadi, R. and Hess, J.d. (2007) Mean-Centering Does Not Alleviate Collinearity Problems in Moderated...

• Replies: 0
• Views: 1,635
02-07-2012, 10:36 AM
30. ### Lowest Mean Squared Error doesn't mean highest R^2?

Question: Well, the title says it already. Does the lowest Mean Squared Error not automatically mean the highest R^2? Reason for asking: I'm doing...

• Replies: 5
• Views: 3,024
02-09-2012, 12:15 AM
31. ### Relation between 2 linear regression curves

Hello Everyone, I'm new here, I'm hoping someone may be able to help me as Im a bit stuck. Its probably so simple but for some reason this problem...

• Replies: 3
• Views: 1,701
02-09-2012, 05:35 PM
32. ### Building a Logisics regression model - help

Audited ~50 patients, and collected 10 potential predictors for each (some quantitative, some indicative, all independent). Trying to develop a...

• Replies: 6
• Views: 2,233
02-09-2012, 06:03 PM
33. ### 95% Intervals

I'm new here (and relatively new to statistics) so I apologize if this thread is in the wrong place. I have a problem that seems relatively easy...

• Replies: 4
• Views: 2,247
02-09-2012, 11:31 PM
34. ### 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: 2,449
02-10-2012, 10:16 AM
35. ### Error in data matrix, least square error analysis

Dear all, I am trying to reach an expression for the mean square error (mse) when the data matrix 'A' in the classical least square problem Ax=b...

• Replies: 0
• Views: 1,789
02-10-2012, 02:17 PM

I have conducted a regression analysis that yields a significant 4-way interaction between: 2 dichotomous within-subjects variables 2 continuous...

• Replies: 0
• Views: 1,598
02-11-2012, 02:19 AM
37. ### Need help with Regression Analysis

Have a problem that I need help with if anyone can help me. The correlation between scores on tests of sociability and sense of humor was found...

• Replies: 1
• Views: 1,356
02-11-2012, 07:08 PM
38. ### Linear Regression mystery

A linear model was built, using 2 explanatory variables and 30 observations. the results were: B=(3.57, -0.18, 1.259)^t (the coefficients) ...

• Replies: 6
• Views: 2,468
02-12-2012, 02:11 PM
39. ### meaningful value for R squared

Hi, I did a simple linear regression with two variables (X & Y), both scores that were calculated (mean) on the basis of scores for the items of...

• Replies: 3
• Views: 5,296
02-13-2012, 09:20 AM
40. ### Multiple Regression and Confounding Factors

I am working on my thesis project which involves analyzing whether a dichotomous independent variable has an effect on a continuous dependent...

• Replies: 3
• Views: 10,581
02-13-2012, 09:45 AM
41. ### Multiple regression for duplicate payments

Has anyone had any kind of experience using regression in financial and accounting areas for multiple or duplicate payments. thanks Vic

• Replies: 0
• Views: 1,470
02-13-2012, 10:24 AM
42. ### Dependent categorical variable

If y is a dependent categorical variable (values 1,2,3) , then how would you show that y is dependent on x1 and x2? My rational is to use a...

• Replies: 2
• Views: 1,697
02-13-2012, 01:57 PM
43. ### marginal effect with wald test

Hi there, In an econometrics assignment we have to check what variable has the largest and smallest marginal effect on our dependent variable wage....

• Replies: 0
• Views: 1,779
02-14-2012, 12:29 PM
44. ### Predicting a Ratio, when the denominator of that Ratio is a logical weight variable

I am attempting a basketball regression. The dataset is a bit complicated to explain, but basically each observation represents a stint of 5 players...

• Replies: 1
• Views: 1,802
02-14-2012, 12:31 PM

Hello all, I am trying to run a nested ANOVA in JMP on some ecological field data - I'm trying to measure whether fish biomass is different in...

• Replies: 30
• Views: 13,848
02-15-2012, 12:22 AM
46. ### Comparing regressions

Hi, I want to conduct a sensitivity analysis on a regression to check if the results are highly influenced by the sample I have. Basically, I want...

• Replies: 3
• Views: 2,218
02-16-2012, 12:40 PM
47. ### 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: 12,689
02-16-2012, 12:47 PM
48. ### 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: 5,991
02-16-2012, 02:06 PM

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