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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...

    Started by rwd5013‎, 05-27-2010 07:59 PM
    • Replies: 4
    • Views: 4,985
    05-28-2010, 07:59 AM Go to last post
  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...

    Started by aix‎, 06-01-2010 02:48 PM
    • Replies: 0
    • Views: 2,973
    06-01-2010, 02:48 PM Go to last post
  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...

    Started by Lake scientist‎, 06-01-2010 03:26 PM
    • Replies: 3
    • Views: 4,053
    06-03-2010, 07:41 PM Go to last post
  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...

    Started by Jurriaan‎, 09-12-2008 09:05 AM
    • Replies: 2
    • Views: 6,994
    06-05-2010, 12:20 AM Go to last post
  5. [Help -please!] Multiple Regression Model

    all done now

    Started by doomedromance‎, 06-05-2010 02:35 AM
    • Replies: 1
    • Views: 2,855
    06-05-2010, 04:55 PM Go to last post
  6. Unhappy assumption of independence

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

    Started by reductico‎, 06-09-2010 09:35 AM
    • Replies: 5
    • Views: 16,675
    06-09-2010, 02:04 PM Go to last post
  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...

    Started by GetItDone‎, 06-09-2010 03:08 PM
    • Replies: 1
    • Views: 5,303
    06-09-2010, 03:34 PM Go to last post
  8. Multiple DVs

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

    Started by justcallmeerik‎, 06-07-2010 03:38 PM
    • Replies: 1
    • Views: 3,461
    06-12-2010, 12:50 AM Go to last post
  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...

    Started by JohnnyBDoe‎, 06-15-2010 05:50 PM
    • Replies: 1
    • Views: 4,451
    06-15-2010, 06:55 PM Go to last post
  10. Question 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? ...

    Started by sachitha‎, 06-16-2010 12:55 AM
    • Replies: 2
    • Views: 5,969
    06-16-2010, 01:56 PM Go to last post
  11. Question 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...

    Started by bernoulli‎, 06-18-2010 03:48 PM
    • Replies: 6
    • Views: 13,995
    06-22-2010, 01:01 AM Go to last post
  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,...

    Started by leo nidas‎, 06-21-2010 06:32 PM
    • Replies: 7
    • Views: 3,960
    06-22-2010, 10:46 AM Go to last post
  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...

    Started by treystasio‎, 06-21-2010 08:31 PM
    • Replies: 3
    • Views: 2,932
    06-25-2010, 01:54 PM Go to last post
  14. Spurious?

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

    Started by GetItDone‎, 06-28-2010 12:00 PM
    • Replies: 0
    • Views: 2,191
    06-28-2010, 12:00 PM Go to last post
  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. ...

    Started by canis11‎, 06-29-2010 10:05 AM
    • Replies: 2
    • Views: 2,498
    06-29-2010, 01:43 PM Go to last post
  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...

    Started by Capslock‎, 07-04-2010 11:31 PM
    • Replies: 0
    • Views: 1,541
    07-04-2010, 11:31 PM Go to last post
  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...

    Started by cordovan66‎, 07-07-2010 05:07 PM
    • Replies: 2
    • Views: 4,864
    07-08-2010, 03:06 PM Go to last post
  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...

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

    Started by blastStu‎, 07-10-2010 02:43 AM
    • Replies: 0
    • Views: 2,826
    07-10-2010, 02:43 AM Go to last post
  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...

    Started by ognuno‎, 07-10-2010 05:01 AM
    • Replies: 0
    • Views: 3,277
    07-10-2010, 05:01 AM Go to last post
  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...

    Started by xbender‎, 07-12-2010 05:43 AM
    • Replies: 2
    • Views: 3,682
    07-12-2010, 07:17 AM Go to last post
  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...

    Started by kladan‎, 07-13-2010 12:24 PM
    • Replies: 5
    • Views: 4,008
    07-13-2010, 02:47 PM Go to last post
  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...

    Started by convivial‎, 07-19-2010 06:41 AM
    • Replies: 3
    • Views: 4,394
    07-19-2010, 10:21 AM Go to last post
  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...

    Started by tiab2005‎, 07-22-2010 03:22 PM
    • Replies: 0
    • Views: 2,650
    07-22-2010, 03:22 PM Go to last post
  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...

    Started by Rob‎, 11-16-2007 11:13 AM
    • Replies: 4
    • Views: 7,796
    07-22-2010, 04:12 PM Go to last post
  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. ...

    Started by danh32‎, 07-22-2010 12:32 PM
    • Replies: 2
    • Views: 7,288
    07-23-2010, 10:10 AM Go to last post
  27. 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: 3,982
    07-23-2010, 11:00 AM Go to last post
  28. 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: 2,867
    07-26-2010, 07:27 AM Go to last post
  29. 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: 3,473
    07-26-2010, 10:36 AM Go to last post
  30. 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: 2,893
    07-26-2010, 10:38 AM Go to last post
  31. 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: 2,259
    07-27-2010, 04:11 AM Go to last post
  32. 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: 5,022
    07-27-2010, 04:31 AM Go to last post
  33. 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: 2,692
    07-27-2010, 06:31 AM Go to last post
  34. 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: 8,336
    07-27-2010, 05:31 PM Go to last post
  35. 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: 5,184
    07-29-2010, 05:44 PM Go to last post
  36. 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: 4,210
    08-02-2010, 07:56 AM Go to last post
  37. 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: 11,175
    08-03-2010, 12:03 PM Go to last post
  38. 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: 3,196
    08-03-2010, 01:58 PM Go to last post
  39. 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: 5,062
    08-03-2010, 04:06 PM Go to last post
  40. 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: 2,323
    08-06-2010, 09:52 AM Go to last post
  41. 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: 2,663
    08-06-2010, 08:12 PM Go to last post
  42. 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: 2,882
    08-07-2010, 01:32 AM Go to last post
  43. 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: 4,392
    08-07-2010, 05:35 AM Go to last post
  44. 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: 8,941
    08-09-2010, 03:29 PM Go to last post
  45. 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: 2,220
    08-10-2010, 05:00 AM Go to last post
  46. 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: 2,619
    08-11-2010, 09:55 AM Go to last post
  47. 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: 3,730
    08-11-2010, 09:58 AM Go to last post
  48. 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
  49. 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: 1,874
    08-11-2010, 11:30 PM Go to last post
  50. 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: 2,118
    08-14-2010, 02:42 AM Go to last post
  51. 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: 2,962
    08-14-2010, 11:28 AM Go to last post
  52. 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: 4,217
    08-14-2010, 01:12 PM Go to last post
  53. 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: 3,017
    08-15-2010, 08:55 PM Go to last post
  54. 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: 2,734
    08-17-2010, 08:44 AM Go to last post
  55. 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: 12,479
    08-17-2010, 09:54 PM Go to last post
  56. 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: 5,940
    08-18-2010, 12:05 AM Go to last post
  57. 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: 2,986
    08-18-2010, 04:39 PM Go to last post
  58. 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: 2,260
    08-19-2010, 12:41 PM Go to last post
  59. 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: 6,339
    08-20-2010, 08:48 AM Go to last post
  60. 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: 4,118
    08-20-2010, 09:12 PM Go to last post

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