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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...

    Started by jonG‎, 09-03-2010 05:34 PM
    • Replies: 1
    • Views: 3,416
    09-03-2010, 05:47 PM Go to last post
  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...

    Started by Kate10‎, 08-30-2010 02:36 PM
    • Replies: 14
    • Views: 5,275
    09-03-2010, 01:35 PM Go to last post
  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...

    Started by tiab2005‎, 09-02-2010 10:14 AM
    • Replies: 1
    • Views: 2,799
    09-02-2010, 10:52 AM Go to last post
  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...

    Started by brakepad‎, 09-01-2010 02:25 PM
    • Replies: 0
    • Views: 1,736
    09-01-2010, 02:25 PM Go to last post
  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...

    Started by lztoby‎, 08-30-2010 09:26 PM
    • Replies: 1
    • Views: 4,327
    08-30-2010, 09:58 PM Go to last post
  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...

    Started by tdenes‎, 08-30-2010 10:17 AM
    • Replies: 0
    • Views: 2,364
    08-30-2010, 10:17 AM Go to last post
  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...

    Started by Humboldt‎, 08-27-2010 02:49 PM
    • Replies: 2
    • Views: 2,604
    08-28-2010, 10:32 AM Go to last post
  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...

    Started by Lotte‎, 08-26-2010 07:06 PM
    • Replies: 3
    • Views: 8,263
    08-27-2010, 09:47 PM Go to last post
  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'...

    Started by Solaris‎, 08-27-2010 04:27 AM
    • Replies: 1
    • Views: 2,868
    08-27-2010, 01:49 PM Go to last post
  10. Question 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...

    Started by sneaks‎, 08-27-2010 06:45 AM
    • Replies: 6
    • Views: 11,334
    08-27-2010, 07:50 AM Go to last post
  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...

    Started by caro23‎, 08-27-2010 03:09 AM
    • Replies: 0
    • Views: 2,798
    08-27-2010, 03:09 AM Go to last post
  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...

    Started by Laurie‎, 08-20-2010 09:48 PM
    • Replies: 2
    • Views: 5,226
    08-26-2010, 08:20 PM Go to last post
  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...

    Started by helenekuo‎, 08-17-2010 06:21 AM
    • Replies: 1
    • Views: 2,471
    08-26-2010, 03:41 PM Go to last post
  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...

    Started by medsonia‎, 08-25-2010 06:08 PM
    • Replies: 0
    • Views: 2,110
    08-25-2010, 06:08 PM Go to last post
  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...

    Started by WeeG‎, 08-24-2010 06:57 AM
    • Replies: 0
    • Views: 3,124
    08-24-2010, 06:57 AM Go to last post
  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...

    Started by WeeG‎, 08-19-2010 04:28 AM
    • Replies: 8
    • Views: 27,062
    08-24-2010, 01:50 AM Go to last post
  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...

    Started by WeeG‎, 08-19-2010 04:26 AM
    • Replies: 4
    • Views: 4,122
    08-20-2010, 09:12 PM Go to last post
  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...

    Started by majkel‎, 08-20-2010 08:48 AM
    • Replies: 0
    • Views: 6,340
    08-20-2010, 08:48 AM Go to last post
  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...

    Started by discostews‎, 08-19-2010 09:49 AM
    • Replies: 2
    • Views: 2,265
    08-19-2010, 12:41 PM Go to last post
  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...

    Started by osknows‎, 08-18-2010 04:10 PM
    • Replies: 3
    • Views: 2,990
    08-18-2010, 04:39 PM Go to last post
  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....

    Started by milo‎, 08-18-2010 12:05 AM
    • Replies: 0
    • Views: 5,945
    08-18-2010, 12:05 AM Go to last post
  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...

    Started by wy38‎, 08-17-2010 10:42 AM
    • Replies: 6
    • Views: 12,485
    08-17-2010, 09:54 PM Go to last post
  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...

    Started by Kate10‎, 08-16-2010 03:49 PM
    • Replies: 6
    • Views: 2,737
    08-17-2010, 08:44 AM Go to last post
  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...

    Started by Pen‎, 08-15-2010 07:13 PM
    • Replies: 2
    • Views: 3,023
    08-15-2010, 08:55 PM Go to last post
  25. Unhappy 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...

    Started by tonynk9‎, 08-14-2010 01:12 PM
    • Replies: 0
    • Views: 4,222
    08-14-2010, 01:12 PM Go to last post
  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...

    Started by Ferro‎, 08-13-2010 05:12 AM
    • Replies: 2
    • Views: 2,970
    08-14-2010, 11:28 AM Go to last post
  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...

    Started by argentina82‎, 08-14-2010 01:20 AM
    • Replies: 1
    • Views: 2,120
    08-14-2010, 02:42 AM Go to last post
  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...

    Started by ajenki10‎, 08-11-2010 06:23 AM
    • Replies: 1
    • Views: 1,876
    08-11-2010, 11:30 PM Go to last post
  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...

    Started by brooklynqueen‎, 08-10-2010 10:31 PM
    • Replies: 9
    • Views: 4,141
    08-11-2010, 05:24 PM Go to last post
  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...

    Started by ajenki10‎, 08-11-2010 08:25 AM
    • Replies: 1
    • Views: 3,737
    08-11-2010, 09:58 AM Go to last post
  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...

    Started by jaluoma‎, 08-11-2010 09:55 AM
    • Replies: 0
    • Views: 2,623
    08-11-2010, 09:55 AM Go to last post
  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...

    Started by svenoxtoby‎, 08-10-2010 05:00 AM
    • Replies: 0
    • Views: 2,222
    08-10-2010, 05:00 AM Go to last post
  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...

    Started by metric‎, 08-09-2010 01:52 PM
    • Replies: 4
    • Views: 8,952
    08-09-2010, 03:29 PM Go to last post
  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. ...

    Started by helenekuo‎, 08-06-2010 05:52 PM
    • Replies: 5
    • Views: 4,394
    08-07-2010, 05:35 AM Go to last post
  35. Drop down menu in R

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

    Started by sonaljaikar‎, 08-07-2010 01:16 AM
    • Replies: 1
    • Views: 2,887
    08-07-2010, 01:32 AM Go to last post
  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...

    Started by evelien1987‎, 08-06-2010 07:47 AM
    • Replies: 1
    • Views: 2,667
    08-06-2010, 08:12 PM Go to last post
  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...

    Started by Jaap‎, 08-06-2010 09:52 AM
    • Replies: 0
    • Views: 2,326
    08-06-2010, 09:52 AM Go to last post
  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...

    Started by steven.balsam‎, 08-01-2010 03:30 PM
    • Replies: 3
    • Views: 5,069
    08-03-2010, 04:06 PM Go to last post
  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...

    Started by t2oo5‎, 08-03-2010 11:42 AM
    • Replies: 1
    • Views: 3,199
    08-03-2010, 01:58 PM Go to last post
  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...

    Started by helenekuo‎, 07-28-2010 06:21 PM
    • Replies: 3
    • Views: 11,181
    08-03-2010, 12:03 PM Go to last post
  41. Linear regression analysis proof question

    Hi, can anyone help me please in writing a proof to the following linear regression problem? I have spent countless hours trying to solve it but am...

    Started by tskhor‎, 08-01-2010 10:27 AM
    • Replies: 2
    • Views: 4,218
    08-02-2010, 07:56 AM Go to last post
  42. 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...

    Started by Pen‎, 07-28-2010 04:00 AM
    • Replies: 1
    • Views: 5,189
    07-29-2010, 05:44 PM Go to last post
  43. 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...

    Started by Pen‎, 07-27-2010 07:25 AM
    • Replies: 2
    • Views: 8,344
    07-27-2010, 05:31 PM Go to last post
  44. 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...

    Started by ex902‎, 07-27-2010 06:31 AM
    • Replies: 0
    • Views: 2,701
    07-27-2010, 06:31 AM Go to last post
  45. 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...

    Started by mariner‎, 07-26-2010 07:33 PM
    • Replies: 1
    • Views: 5,023
    07-27-2010, 04:31 AM Go to last post
  46. 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...

    Started by Julian360‎, 07-27-2010 04:11 AM
    • Replies: 0
    • Views: 2,264
    07-27-2010, 04:11 AM Go to last post
  47. 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...

    Started by Servellen‎, 07-26-2010 03:59 AM
    • Replies: 1
    • Views: 2,895
    07-26-2010, 10:38 AM Go to last post
  48. 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...

    Started by tiab2005‎, 07-26-2010 03:10 AM
    • Replies: 1
    • Views: 3,477
    07-26-2010, 10:36 AM Go to last post
  49. Question Help a programmer with very simple Linear Regression (ordinary least squares?)

    Hi everyone, I'm a programmer, so I don't have much understanding of statistics. But I am supposed to write a program for my company that...

    Started by jamescox‎, 10-08-2009 04:02 PM
    • Replies: 4
    • Views: 2,872
    07-26-2010, 07:27 AM Go to last post
  50. Question 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...

    Started by tammy84‎, 07-23-2010 11:00 AM
    • Replies: 0
    • Views: 3,986
    07-23-2010, 11:00 AM Go to last post
  51. 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. ...

    Started by danh32‎, 07-22-2010 12:32 PM
    • Replies: 2
    • Views: 7,292
    07-23-2010, 10:10 AM Go to last post
  52. 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...

    Started by Rob‎, 11-16-2007 11:13 AM
    • Replies: 4
    • Views: 7,809
    07-22-2010, 04:12 PM Go to last post
  53. 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...

    Started by tiab2005‎, 07-22-2010 03:22 PM
    • Replies: 0
    • Views: 2,654
    07-22-2010, 03:22 PM Go to last post
  54. 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...

    Started by convivial‎, 07-19-2010 06:41 AM
    • Replies: 3
    • Views: 4,397
    07-19-2010, 10:21 AM Go to last post
  55. 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...

    Started by kladan‎, 07-13-2010 12:24 PM
    • Replies: 5
    • Views: 4,011
    07-13-2010, 02:47 PM Go to last post
  56. 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...

    Started by xbender‎, 07-12-2010 05:43 AM
    • Replies: 2
    • Views: 3,686
    07-12-2010, 07:17 AM Go to last post
  57. 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...

    Started by ognuno‎, 07-10-2010 05:01 AM
    • Replies: 0
    • Views: 3,281
    07-10-2010, 05:01 AM Go to last post
  58. 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...

    Started by blastStu‎, 07-10-2010 02:43 AM
    • Replies: 0
    • Views: 2,829
    07-10-2010, 02:43 AM Go to last post
  59. 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...

    Started by nwigg‎, 07-09-2010 09:47 PM
    • Replies: 7
    • Views: 3,024
    07-09-2010, 11:12 PM Go to last post
  60. 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...

    Started by cordovan66‎, 07-07-2010 05:07 PM
    • Replies: 2
    • Views: 4,865
    07-08-2010, 03:06 PM Go to last post

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