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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Linear Regression Underestimating Sales Forecast

Guys, I want to share a flawed method i've been dealing with. I am currently using linear regression to find the coefficent of Year-over-year...

• Replies: 4
• Views: 4,985
05-28-2010, 07:59 AM
2. ### Combining linear regressions

I have two variables, x and y, and I am using linear regression to predict y from x over a large set of subjects. There are multiple observations per...

• Replies: 0
• Views: 2,973
aix
06-01-2010, 02:48 PM
3. ### Regression brain teaser

I have data for 100 farm ponds. I have data for 4 variables: pollution in the pond, number of cows that graze near the pond, number of pigs that...

• Replies: 3
• Views: 4,053
06-03-2010, 07:41 PM
4. ### Linear regression with repeated measures

Hi, I have the following question: I have a dataset that contains data from 9 subjects that were tested twice for a couple variables. I try to do a...

• Replies: 2
• Views: 6,994
06-05-2010, 12:20 AM
5. ### [Help -please!] Multiple Regression Model

all done now

• Replies: 1
• Views: 2,855
06-05-2010, 04:55 PM
6. ### assumption of independence

Why is it important that cases are independent in regression (especially, logistic regression)? By "independent" i mean that observations under...

• Replies: 5
• Views: 16,675
06-09-2010, 02:04 PM
7. ### Gauss-Markov: Assumption no.5.

"Correlation between independent variables and the error term is 0". How do i check this (in SPSS)? I know this is basically the same as the...

• Replies: 1
• Views: 5,303
06-09-2010, 03:34 PM
8. ### Multiple DVs

Hey all, I've been tasked with determining the "best" IV (various demographics) for predicting overall purchase behavior, as determined by...

• Replies: 1
• Views: 3,461
06-12-2010, 12:50 AM
9. ### Multiple Regression, Collinearity Question

Hello All, I'm running a multiple regression on 8 predictors. A few of the predictors have positive correlations with the response, however their...

• Replies: 1
• Views: 4,451
06-15-2010, 06:55 PM
10. ### Multiple Regression analysis for dependent variable with multiple dimensions..

Hi All, with respect to Multiple Regression Analysis, is it possible to regress 6 dependent variable dimensions against 1 independent variable? ...

• Replies: 2
• Views: 5,969
06-16-2010, 01:56 PM
11. ### Calculating prediction intervals (error estimates of specific predicted points) in a

Hi all, this is my first post here so please let me know if I need to provide more details. I want to generate a multivariate logistic regression...

• Replies: 6
• Views: 13,995
06-22-2010, 01:01 AM
12. ### linear regression short easy question

Hi there, I have the response Y and some covariates. I want to do linear regression. Among the covariates there is the covariate sex (1: male,...

• Replies: 7
• Views: 3,960
06-22-2010, 10:46 AM
13. ### Additive regression question

Currently, I'm trying to create a regression equation that can help my boss predict employee hours for the upcoming month. Basically, if we already...

• Replies: 3
• Views: 2,932
06-25-2010, 01:54 PM
14. ### Spurious?

Hi there! If i am doing a multiple linear regression in SPSS, and have a model where: 1.Market orientation -> Information Quality...

• Replies: 0
• Views: 2,191
06-28-2010, 12:00 PM
15. ### Want to regress (statistically), but can it be done?

I have population size over time with many gaps (the unfortunate reality of many biological data sets!): there are only 12 points over 37 years. ...

• Replies: 2
• Views: 2,498
06-29-2010, 01:43 PM
16. ### Non linear regression and under-/overvaluation calc.

As you know the Security Market Line is used to find under- or overvalued securities (if they plot below or above the SML). I am doing something...

• Replies: 0
• Views: 1,541
07-04-2010, 11:31 PM
17. ### 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: 4,864
07-08-2010, 03:06 PM
18. ### 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
19. ### 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: 2,826
07-10-2010, 02:43 AM
20. ### 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: 3,277
07-10-2010, 05:01 AM
21. ### 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: 3,682
07-12-2010, 07:17 AM
22. ### 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: 4,008
07-13-2010, 02:47 PM
23. ### 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: 4,394
07-19-2010, 10:21 AM
24. ### 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: 2,650
07-22-2010, 03:22 PM
25. ### 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: 7,796
07-22-2010, 04:12 PM
26. ### 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: 7,288
07-23-2010, 10:10 AM
27. ### 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: 3,982
07-23-2010, 11:00 AM
28. ### 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: 3,473
07-26-2010, 10:36 AM
29. ### 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: 2,893
07-26-2010, 10:38 AM
30. ### 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: 2,259
07-27-2010, 04:11 AM
31. ### 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: 5,022
07-27-2010, 04:31 AM
32. ### 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: 2,692
07-27-2010, 06:31 AM
33. ### 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: 8,336
Pen
07-27-2010, 05:31 PM
34. ### 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: 5,184
07-29-2010, 05:44 PM
35. ### 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: 11,175
08-03-2010, 12:03 PM
36. ### 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: 3,196
08-03-2010, 01:58 PM
37. ### 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: 5,062
08-03-2010, 04:06 PM
38. ### 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: 2,323
08-06-2010, 09:52 AM
39. ### 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: 2,663
08-06-2010, 08:12 PM
40. ### Drop down menu in R

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

• Replies: 1
• Views: 2,882
08-07-2010, 01:32 AM
41. ### 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: 4,392
08-07-2010, 05:35 AM
42. ### 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: 8,941
08-09-2010, 03:29 PM
43. ### 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: 2,220
08-10-2010, 05:00 AM
44. ### 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: 2,619
08-11-2010, 09:55 AM
45. ### 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: 3,730
08-11-2010, 09:58 AM
46. ### 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
47. ### 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: 1,874
08-11-2010, 11:30 PM
48. ### 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: 2,118
08-14-2010, 02:42 AM
49. ### 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: 2,962
08-14-2010, 11:28 AM
50. ### 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: 4,217
08-14-2010, 01:12 PM
51. ### 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: 3,017
Pen
08-15-2010, 08:55 PM
52. ### 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: 2,734
08-17-2010, 08:44 AM
53. ### 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: 12,479
08-17-2010, 09:54 PM
54. ### 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: 5,940
08-18-2010, 12:05 AM
55. ### 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: 2,986
08-18-2010, 04:39 PM
56. ### 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: 2,260
08-19-2010, 12:41 PM
57. ### 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: 6,339
08-20-2010, 08:48 AM
58. ### 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: 4,118
08-20-2010, 09:12 PM

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