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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### 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
2. ### Articles/information on robust regression?

Hi, I am a little confused as to what methods there are for "robust" regression. I thought it was an actual type (as in logistic, linear, etc),...

• Replies: 5
• Views: 2,366
02-26-2012, 07:32 PM
3. ### how many time dummies in pooled regression?

Hi guys, I want to perform a cross sectional time series regression - fixed effects model. Am I correct that it is better to group time by time...

• Replies: 2
• Views: 3,437
02-26-2012, 06:43 PM
4. ### Is this an instance of simultaneity? Can you help me understand why?

I cant seem to figure this out, as standard descriptions of simultaneity in econometrics textbooks don't quite seem to fit. 1. I have panel data...

• Replies: 0
• Views: 1,641
02-24-2012, 10:45 PM
5. ### multivariate logistic regression

Hello, I need to perform multivariate logistic regression on 3 binary variables. My independent variables are also categorical (3-10 levels)...

• Replies: 1
• Views: 2,252
02-24-2012, 10:09 AM
6. ### Regression of Conditional Expectations E[Y|X,Z=z] = f(E[X|Z=z])

Hello all, I have a regression problem I'm interested in that seem like it should be a fairly common and well understood, but due to my weak...

• Replies: 0
• Views: 1,613
02-23-2012, 01:12 PM
7. ### Regression on Composite Rates

I have what may be a simple question, but I have been unable to find an appropriate methodology, and I am hoping that one of you may be able to help....

• Replies: 0
• Views: 2,496
02-22-2012, 06:26 PM
8. ### Interpreting mean centered polynomial regression

Hi, I'm running a simple OLS regression and want to examine non-linear effects. Therefore I have included a square term of the independent...

• Replies: 0
• Views: 2,967
02-21-2012, 02:56 PM
9. ### Number of Observations Question

I am currently completing a research project on a certain type of fund. I would like to conduct a time series. It is my aim to analyse the...

• Replies: 0
• Views: 1,511
02-21-2012, 11:47 AM
10. ### Regression on Counts

Hi, I have data on number of laps mice have run over several days after an injection (simulate injury) and receiving one of two treatments...

• Replies: 7
• Views: 2,560
02-20-2012, 04:09 PM
11. ### Ordered Logit Model

Using the World Values Survey (http://www.wvsevsdb.com/wvs/WVSData.jsp), I am trying to run an ordered logit model on a continuous dependent variable...

• Replies: 1
• Views: 1,899
02-20-2012, 12:48 PM
12. ### Why does efficiency matter

In a discussion of my old favorite non-normal data, Fox notes that while CI and test of signficance are commonly not effected much by nonnormality in...

• Replies: 5
• Views: 1,738
02-17-2012, 11:49 AM
13. ### Grouping response in logistic regression

Hi, I'm new to statistics and hope to find some help here. I can't find any information on why in logistic regression a binary response is often...

• Replies: 2
• Views: 1,981
02-17-2012, 11:10 AM
14. ### Calculating adjusted treatment means in regression

Hi, I have two treatment groups, intervention (n=76) and control (n=156). I have a dependent variable, weight, and a couple of baseline variables...

• Replies: 1
• Views: 2,468
02-16-2012, 03:08 PM
15. ### 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
16. ### 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
17. ### 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: 2,197
02-16-2012, 12:40 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: 13,780
02-15-2012, 12:22 AM
19. ### 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: 1,792
02-14-2012, 12:31 PM
20. ### 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: 1,762
02-14-2012, 12:29 PM
21. ### 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: 1,685
02-13-2012, 01:57 PM
22. ### 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: 1,464
02-13-2012, 10:24 AM
23. ### 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: 10,543
02-13-2012, 09:45 AM
24. ### 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: 5,260
02-13-2012, 09:20 AM
25. ### 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: 2,454
02-12-2012, 02:11 PM
26. ### 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: 1,350
02-11-2012, 07:08 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: 1,583
02-11-2012, 02:19 AM
28. ### 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: 1,779
02-10-2012, 02:17 PM
29. ### 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
30. ### 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: 2,233
02-09-2012, 11:31 PM
31. ### 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: 2,216
02-09-2012, 06:03 PM
32. ### 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: 1,689
02-09-2012, 05:35 PM
33. ### 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: 2,997
02-09-2012, 12:15 AM
34. ### 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: 1,623
02-07-2012, 10:36 AM
35. ### 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: 1,328
02-07-2012, 07:28 AM
36. ### 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: 2,942
02-06-2012, 02:09 PM
37. ### 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: 3,756
02-05-2012, 01:44 PM
38. ### 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: 2,410
02-03-2012, 01:04 PM
39. ### [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: 1,827
02-03-2012, 11:11 AM
40. ### 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: 2,149
02-03-2012, 10:23 AM
41. ### 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: 2,511
02-03-2012, 05:08 AM
42. ### [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: 4,769
02-03-2012, 03:10 AM
43. ### 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: 4,224
02-02-2012, 10:25 AM
44. ### 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: 7,976
02-02-2012, 08:51 AM
45. ### 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: 9,213
02-01-2012, 12:23 AM
46. ### 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: 2,508
01-31-2012, 08:25 AM
47. ### 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
48. ### 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: 6,598
01-30-2012, 01:26 PM
49. ### 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: 4,076
01-30-2012, 06:43 AM
50. ### 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: 1,417
01-28-2012, 01:03 PM

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