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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Multiple vs univariate regression

Hi, I was wondering what are the pitfalls of fitting multiple univariate regression equations to a response instead of fitting all independent...

• Replies: 1
• Views: 3,416
09-03-2010, 05:47 PM
2. ### Need help urgently

I need to run a test to run if a relationship is significant. Hyphothesis H1: Entertainment of the advertisement on web is positively associated...

• Replies: 14
• Views: 5,275
09-03-2010, 01:35 PM
3. ### Negative Binomial Regression- General Question

If I have an independent variable (X1) that only takes integer values, why do I log that in the regression model? (My dependent variable (Y) is also...

• Replies: 1
• Views: 2,799
09-02-2010, 10:52 AM
4. ### multivariate optimazion question

Hi all, I need to solve a optimization problem like this min||XW-YV||_{F}^{2}, that's to minimize the Frobenius norm. X and Y have the same...

• Replies: 0
• Views: 1,736
09-01-2010, 02:25 PM
5. ### Differences Between ANOVA and multiple regression

What are the differences between ANOVA and multiple regression? If I want to figure out if there exist impacts of one variable on the other, which...

• Replies: 1
• Views: 4,327
08-30-2010, 09:58 PM
6. ### Varying coefficient problem with weighted regression - DOES IT MAKE SENSE?

Dear List, Please consider first a toy example. Suppose we have a large norming database with three variables, representing raw score on a...

• Replies: 0
• Views: 2,364
08-30-2010, 10:17 AM
7. ### regression with covariate

I want to develop a relationship between water temperature released at a dam and the volume of water stored in the reservoir behind the dam. But I...

• Replies: 2
• Views: 2,604
08-28-2010, 10:32 AM
8. ### Ordinal Regression: Test of Parallel Lines

Hi, I am trying to fit a model by using ordinal regression. I have got two co-variates, and one factor with four groups. The dependent variable...

• Replies: 3
• Views: 8,263
08-27-2010, 09:47 PM
9. ### Puzzling Regression issue.

First post :D Wondering if anyone could lend a hand, I can't figure this out. When I perform two separate regression analyses ('promotion_A'...

• Replies: 1
• Views: 2,868
08-27-2010, 01:49 PM
10. ### Regression with a categorical moderator (with 3 catoegories)

Hi All. I am wanting to run a moderating regression. But my moderator has 3 categories(Black, Asian, White). Usually, with a dichotomous...

• Replies: 6
• Views: 11,334
08-27-2010, 07:50 AM
11. ### Dummy regression for graded paired comparison

Hi all, I'm trying to create a dummy regression for a conjoint analysis with graded paired comparison. here is an example of one paired...

• Replies: 0
• Views: 2,798
08-27-2010, 03:09 AM
12. ### Negative fitted values

Hi, I am trying to imput the prices of houses in a database using information on the carachteristics of the houses and a database in which i have...

• Replies: 2
• Views: 5,226
08-26-2010, 08:20 PM
13. ### to trust AIC (non-full model) or slope (full model)

The purpose to run regressions for butterfly richness again 5 environmental variables is to show the importance rank of the independent variables...

• Replies: 1
• Views: 2,471
08-26-2010, 03:41 PM
14. ### caculation of Type III ss?

How can I calculate the missing Type III ss for one variable and mean square, If I got the Type I ss and means square for all variables and Type III...

• Replies: 0
• Views: 2,110
08-25-2010, 06:08 PM
15. ### need help choosing the right model

following another thread I opened, I need your advice to choose the correct logistic model. I had 8 IV's, I ran 8 univariate models (used the method...

• Replies: 0
• Views: 3,124
08-24-2010, 06:57 AM
16. ### Collinearity in Logistic Regression

If my independent variables are correlated in Linear Regression, I can first, check it using VIF, and solve it (PLS, other ways). What do I do if...

• Replies: 8
• Views: 27,062
08-24-2010, 01:50 AM
17. ### problem with independent variables

Hello, I need your advice. I have a data file, with a binary dependent variable and some independent ones. For each person (case), there were 3...

• Replies: 4
• Views: 4,122
08-20-2010, 09:12 PM
18. ### Heteroscedasticity in logistic regression

Hi! I have a question regarding heteroscedasticity in binary logistic regression, and would be most grateful for any kind of feedback. I am...

• Replies: 0
• Views: 6,340
08-20-2010, 08:48 AM
19. ### Analysis of model outputs

Hey there, I'm looking for some help/advice about a problem that I would like to tackle. I have a set of input-output (X-y) data. The aim of...

• Replies: 2
• Views: 2,265
08-19-2010, 12:41 PM
20. ### Review Methodology

Hello, I'm about to embark on some mutivariate regression analysis for my company but it's been a while since I've used these methods. The outputs...

• Replies: 3
• Views: 2,990
08-18-2010, 04:39 PM
21. ### Pros and cons of using partial least square regression

Hello guys, I have a computational model of a single cardiac cell. With it I have generated a data matrix consisting of columns of inputs (e.g....

• Replies: 0
• Views: 5,945
08-18-2010, 12:05 AM
22. ### Categorical Count Data and ANOVA

Hi, I hope this is in the right section. I heard that ANOVA shouldn't be used for analysing categorical count data. If this is the case, can...

• Replies: 6
• Views: 12,485
08-17-2010, 09:54 PM
23. ### Correlation

Hi! I was wondering if someone could give me some help. I am struggeling to understand how to run my correlation analysis using SPSS This is my...

• Replies: 6
• Views: 2,737
08-17-2010, 08:44 AM
24. ### Regression or Correlation?

I have collected a range of genetic and non-genetic factors from a series of natural populations and I want to know if; a) how close the correlation...

• Replies: 2
• Views: 3,023
Pen
08-15-2010, 08:55 PM
25. ### is it possible for all variables results in no significant value?

i need help on my multiple linear regression statistics assignment on conclusion and recommendation part... my problem is all the independent...

• Replies: 0
• Views: 4,222
08-14-2010, 01:12 PM
26. ### Is this possible?

I have found some scientific papers in which a spline regression is performed with a categorical dependent (death) and a continuous predictor. In the...

• Replies: 2
• Views: 2,970
08-14-2010, 11:28 AM
27. ### Need help with analysis for my dissertation

Hi, I wonder if someone in this forum offers the service of data analysis (regressions) and accept paypal payment. I need to analyze some variables...

• Replies: 1
• Views: 2,120
08-14-2010, 02:42 AM
28. ### Multiple Regression

Hi, I am trying to do my analysis for my work but getting very confused. I am using multiple regression and have my dependent variable, which...

• Replies: 1
• Views: 1,876
08-11-2010, 11:30 PM
29. ### So many variables--how to approach this?

I'm working on a project about depression as a possible side effect of a particular medication. The people who take this drug also tend to have...

• Replies: 9
• Views: 4,141
08-11-2010, 05:24 PM
30. ### Multiple Regression, Analysing Attachment Dimensions

Hi, I am trying to do my analysis for my work but getting very confused. I am using multiple regression (SPSS version 17) and have my...

• Replies: 1
• Views: 3,737
08-11-2010, 09:58 AM
31. ### Endogeneity in longitudinal regression analysis

Hi all, I'm doing regression analysis on panel data. I control for omitted variables using a fixed-effects model. However, it seems that my...

• Replies: 0
• Views: 2,623
08-11-2010, 09:55 AM
32. ### Apples-to-apples needs same trend fn form between cases?

Hi A rather conceptual question, if someone could perhaps illuminate: I am investigating possible correlation between an independent and...

• Replies: 0
• Views: 2,222
08-10-2010, 05:00 AM
33. ### How many data points needed before a nonlinear regression model can be performed?

With a within-subject design of only one independent variable, I'm wondering how many data points (levels of the indept variable along X axis) do I...

• Replies: 4
• Views: 8,952
08-09-2010, 03:29 PM
34. ### 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: 4,394
08-07-2010, 05:35 AM
35. ### Drop down menu in R

Has anyone of you worked on drop down menu in R ?

• Replies: 1
• Views: 2,887
08-07-2010, 01:32 AM
36. ### 3 way interaction urgent :(

Hi I have a question about 3 way interaction. I have two IV: - inside out human resource planning - soft human resource planning the DV is...

• Replies: 1
• Views: 2,667
08-06-2010, 08:12 PM
37. ### Regression problems, different stocks & variables same date

Hi all, Thank you for clicking on this thread and perhaps taking the time to answer my problem. Greatly appreciated! Here is my problem. In my...

• Replies: 0
• Views: 2,326
08-06-2010, 09:52 AM
38. ### What to do when the continuous dependent variable is zero more than 50% of the time

That's basically the question - What to do when the continuous dependent variable is zero more than 50% of the time? Are there alternatives to...

• Replies: 3
• Views: 5,069
08-03-2010, 04:06 PM
39. ### Multicollinearity and SigmaStat

Hello all, First, thank you for taking the time to read and answer my question! I am doing a multiple logistic regression analysis in Sigma...

• Replies: 1
• Views: 3,199
08-03-2010, 01:58 PM
40. ### negative AIC ?

Hello, I ran model selection by delta AIC but encountered most of the AIC as negative. (R package AICcmodavg and stat : AIC) As reviewed by...

• Replies: 3
• Views: 11,181
08-03-2010, 12:03 PM
41. ### positive and negative beta

G'day. I was wondering, in my multiple regression model, I added only all positive or all negatively correlated independent variables thinking...

• Replies: 1
• Views: 5,189
07-29-2010, 05:44 PM
42. ### Multiple regression models, AIC and PASW

Hi. I would like to calculate AIC values from the different models I have created via stepwise multiple regression in the program PASW (SPSS). I...

• Replies: 2
• Views: 8,344
Pen
07-27-2010, 05:31 PM
43. ### reg. ana. F sig undefined but p values are ok ?

Hi people, this is my first message. I try to use regression in my studies and there are some difficulties that I met. I use excel for reg...

• Replies: 0
• Views: 2,701
07-27-2010, 06:31 AM
44. ### hierarchical multiple regression in SPSS-how?

I'm working on my dissertation and I need help using SPSS to run my regression analyses. I'm supposed to use step-wise, but I'm not sure I'm doing...

• Replies: 1
• Views: 5,023
07-27-2010, 04:31 AM
45. ### min. cases for TSCS

Hey all, does anybody know how many cases I should include at least for a time series cross sectional analysis (TSCS)? I plan to analyse 4...

• Replies: 0
• Views: 2,264
07-27-2010, 04:11 AM
46. ### Power analysis for multiple regression question

Hi All, I am setting up research design using multiple regression in developmental psychology context, using: 2 predictors where each can be...

• Replies: 1
• Views: 2,895
07-26-2010, 10:38 AM
47. ### Moderating variable in Regression

I'm running a regression with a Moderating variable (M) and an independent variable (X). Its my understanding that I need to run the following...

• Replies: 1
• Views: 3,477
07-26-2010, 10:36 AM
48. ### 4 DV's in a regression analysis

I need to conduct a Regression analysis with 2 IV's and 4 DV's, I was wondering if this is something that is possible? I want to test out a model...

• Replies: 0
• Views: 3,986
07-23-2010, 11:00 AM
49. ### Variables in Logistic Regression Analysis

I am trying to come up with a model to predict a binary dependent solution. I want to incorporate ordinal independant variables as the predictors. ...

• Replies: 2
• Views: 7,292
07-23-2010, 10:10 AM
50. ### Combining Prediction Intervals

I'm having trouble finding how to combine a number of prediction intervals. The best way to explain the problem is: Imagine a race with 4 relay...

• Replies: 4
• Views: 7,809
07-22-2010, 04:12 PM
51. ### publication-level regression (count data)

My dependent is the number of times a publication was cited. The independent variables are variables that measure the quality of authors and their...

• Replies: 0
• Views: 2,654
07-22-2010, 03:22 PM
52. ### 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: 4,397
07-19-2010, 10:21 AM
53. ### Categorical regression question

Hi, everyone Hope the experts here can help me out with a question. I have a database with several respondents providing data on...

• Replies: 5
• Views: 4,011
07-13-2010, 02:47 PM
54. ### multiple linear regression

Hello, I have an econometric model using multiple linear regression. lets say Q=alpha+beta*P1+gamma*P2+residuals I would like to ask if the...

• Replies: 2
• Views: 3,686
07-12-2010, 07:17 AM
55. ### regression with ranked values

I have a problem I want to make a regression analyse with a few independent variables and 1 dependent variable. The data is all ranked. The...

• Replies: 0
• Views: 3,281
07-10-2010, 05:01 AM
56. ### Comparing independent variables in a regression

Hi, I have performed a multiple regression (in SPSS). This is fine, and I've got significant coefficients which tell me their influence on the...

• Replies: 0
• Views: 2,829
07-10-2010, 02:43 AM
57. ### Simple logistic regresssion question

I am currently doing a project that requires some simple logistic regression analysis in SAS(version 9.1). For some reason my results seem to be the...

• Replies: 7
• Views: 3,024
07-09-2010, 11:12 PM
58. ### Multivariate Poisson regression

I have a linear model y=Ax where y and x are vectors and A is a matrix. The dimensionality of y is more than that of x. Further y has Poissonian...

• Replies: 2
• Views: 4,865
07-08-2010, 03:06 PM

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