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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Question Logistic regression - behavior of uncorrelated predictors

    Hi all, I am a bit puzzled about the behavior of uncorrelated predictors in logistic regression. As in OLS, I thought that if two predictors (X1...

    Started by felize2000‎, 07-03-2012 02:22 PM
    logistic regression, regression coefficients, uncorrelated
    • Replies: 1
    • Views: 1,426
    07-03-2012, 02:35 PM Go to last post
  2. Error propagation for non-linear regression parameters

    Hi, I've been doing non-linear regression on some datasets using R. The regression outputs parameter estimation and parameter standard error (SE)...

    Started by jorfid‎, 07-03-2012 10:46 AM
    error propagation, non-linear regression
    • Replies: 0
    • Views: 2,369
    07-03-2012, 10:46 AM Go to last post
  3. Restricted cubic splines with dichotomous outcome

    Do anyone know if it's possible to perform a regression using restricted cubic splies with a dichotomous outcome?

    Started by mikkelbrabrand‎, 07-03-2012 07:15 AM
    • Replies: 1
    • Views: 3,269
    07-03-2012, 09:57 AM Go to last post
  4. One dependent variable contingent upon another

    I am running two separate regression analyses where I have the same set of independent variables but in one case the dependent variable (DV1) is a...

    Started by arindam‎, 06-26-2012 05:17 AM
    contingent, regression
    • Replies: 1
    • Views: 2,083
    06-29-2012, 12:50 PM Go to last post

    Dear All I am trying to get my head around when to use ANOVA when to use regeression and when to use REML. As I understand REML can be used in...

    Started by joanne1999‎, 06-27-2012 04:56 AM
    anova, correlation, regression, reml, unbalanced
    • Replies: 1
    • Views: 3,068
    06-29-2012, 12:24 PM Go to last post
  6. Box-Tidwell procedure

    Hello everyone, Is there a possibility to perform Box-Tidwell procedure in SPSS, or any other convenient software? Thanks.

    Started by bekkiee‎, 06-28-2012 04:38 PM
    • Replies: 0
    • Views: 5,595
    06-28-2012, 04:38 PM Go to last post
  7. T-Test vs. Welch

    So, I know very little about statistics and hope you could help me. I understand that I should run a t-test when variances are similar. And a...

    Started by botnut‎, 06-28-2012 09:21 AM
    • Replies: 0
    • Views: 2,506
    06-28-2012, 09:21 AM Go to last post
  8. Multiple Linear Regression: Transformation, testing of normality, heteroscedasticity

    Hello everyone, I have a question that might be a basic one, but still I want to reassure myself that I am not on the wrong path by hearing the...

    Started by bekkiee‎, 06-27-2012 05:09 PM
    • Replies: 6
    • Views: 4,906
    06-28-2012, 09:18 AM Go to last post
  9. Intepretation of intercept in repeated-measures regression model

    Hello, According to my understanding, in linear regression if there's an interaction including continuous predictors then the intercept is not...

    Started by ganajr‎, 06-27-2012 10:47 PM
    • Replies: 3
    • Views: 3,121
    06-28-2012, 08:18 AM Go to last post
  10. Help with multiple regression analyses for attachment data

    Hi all, Would appreciate it if anyone could direct me with some really helpful info with regard to the subject matter. I've a dataset of ECR data...

    Started by shawnee‎, 06-26-2012 02:51 AM
    attachment, multiple regression, psychology, regression analysis
    • Replies: 0
    • Views: 1,572
    06-26-2012, 02:51 AM Go to last post
  11. Best analysis to use.

    Hi - I am new to using Stats and wanted to know if regression would work in the below scenario. I have two sets of hotel occupancy rates by...

    Started by BB1303‎, 06-25-2012 12:57 AM
    • Replies: 4
    • Views: 1,975
    06-25-2012, 08:03 PM Go to last post
  12. Fixed effects (FE) vs. Generalized Equations Estimation (GEE)

    Friends, let me quickly give you the context of my question first: I am analyzing an unbalanced panel of 200 companies across 4 years. My research...

    Started by viper430‎, 06-21-2012 05:25 PM
    • Replies: 1
    • Views: 4,992
    06-25-2012, 04:50 PM Go to last post
  13. Linear regression, probably simple...

    Hello group, first post, this has also been posted in the "Statistics" forum: I have one physiological outcome variable and 3 independent...

    Started by Repete Pete‎, 06-25-2012 02:37 AM
    • Replies: 2
    • Views: 2,387
    06-25-2012, 12:31 PM Go to last post
  14. Leave one out cross validation

    Hello I need to write down the disadvantages of the leave one out cross validation method when using small samples, and I need a little assistance...

    Started by NN_STAT‎, 06-24-2012 08:24 AM
    • Replies: 0
    • Views: 2,130
    06-24-2012, 08:24 AM Go to last post
  15. how to understand fixed effects vs. random effects?

    hello, all I have had a hard time trying to understand the concepts of fixed effects and random effects. I have googled a lot for help, but still...

    Started by keyima‎, 06-23-2012 09:02 PM
    • Replies: 0
    • Views: 1,572
    06-23-2012, 09:02 PM Go to last post
  16. Cool Can stepwise regression be conducted nonparametrically?

    Hi, I have some data that has shown significance with some variables using SAS mm estimator nonparametric regression, whereas the log transformed...

    Started by Lunarider‎, 06-23-2012 02:05 PM
    • Replies: 0
    • Views: 1,127
    06-23-2012, 02:05 PM Go to last post
  17. Pooled cross sectional data: How to test for and handle autocorrelation?

    Hi, 1) My goal: I am making a difference-in-difference analysis to estimate the development in political efficacy for a certain group of people...

    Started by MHansen‎, 06-23-2012 09:50 AM
    autocorrelation, durbin-watson, lagged effects, pooled cross section
    • Replies: 0
    • Views: 4,223
    06-23-2012, 09:50 AM Go to last post
  18. Critique my endogeneity proof.

    solved solved

    Started by derksheng‎, 06-23-2012 07:03 AM
    • Replies: 0
    • Views: 1,793
    06-23-2012, 07:03 AM Go to last post
  19. Question autocorrelation test?

    should i perform an autocorrelation test such as DW test to a cross-sectional data? what actually autocorrelation means for cross-sectional data?...

    Started by anwarlatif‎, 06-23-2012 02:52 AM
    • Replies: 0
    • Views: 1,312
    06-23-2012, 02:52 AM Go to last post
  20. Liner regression interpretation

    Hello Seniors, In my regression analysis I want to find, how “% change” is affected by other variables, the day of the month (Sunday, Monday etc.)...

    Started by amandeepsharma89‎, 06-22-2012 11:24 AM
    • Replies: 0
    • Views: 1,877
    06-22-2012, 11:24 AM Go to last post
  21. Why is there endogeneity in this specification?

    See http://www.talkstats.com/showthread.php/26427-Critique-my-endogeneity-proof.

    Started by derksheng‎, 06-21-2012 06:01 AM
    • Replies: 1
    • Views: 1,598
    06-22-2012, 09:26 AM Go to last post
  22. Interpreting log-linear coefficients

    Hi there, I am fairly new to regression and have been set the task of modelling a data set in the form ln(y) = bx1 +bx2 +bx3 +bx4 +bx5 + e. In...

    Started by adam15‎, 04-18-2012 06:37 AM
    • Replies: 3
    • Views: 5,956
    06-22-2012, 04:19 AM Go to last post
  23. variance for multiple regression model

    studying for a test.. any help appreciated.. Consider the multiple regression model Y = Xβ + ϵ, where X is n x (k+1) matrix, β is a vector of...

    Started by hanelliot‎, 06-21-2009 12:00 PM
    • Replies: 5
    • Views: 7,793
    06-22-2012, 03:47 AM Go to last post
  24. interpretation of principal component regression results

    Hello, I have a question about the interpretation of individual variables using a PCA regression method. And because PCR requires a different...

    Started by RuudM123‎, 06-22-2012 03:29 AM
    • Replies: 0
    • Views: 2,531
    06-22-2012, 03:29 AM Go to last post
  25. Combining the effect of the linear and the Quadratic terms in Regression

    Hi all, I am running a poisson regression model where I have linear term and quadratic term of time as predictors. When both are significant, can...

    Started by Avatar‎, 06-20-2012 07:39 PM
    • Replies: 5
    • Views: 2,656
    06-21-2012, 11:17 AM Go to last post
  26. Poisson Rate Regression: Offset?

    Hi! I'm comparing two groups on the # of hospitalizations they have in a 5 year period. Length of hospitalization stay is highly variable. For...

    Started by jamesmartinn‎, 06-20-2012 10:12 AM
    • Replies: 3
    • Views: 3,363
    06-21-2012, 07:11 AM Go to last post
  27. Wink Multipel linear regression or Anova?

    I am in the middle of a written exam where I have to examine a causal claim controlling for gender, age and occupation. The dependent variable is...

    Started by Ann91‎, 06-16-2012 04:17 AM
    • Replies: 1
    • Views: 1,221
    06-20-2012, 02:46 PM Go to last post
  28. Regression problems based on glm repeated measures and multicollinearity

    Hello, I am conducting a thesis in which I study the relationship of 3 independent variables to 1 dependent. In addition, I use 3 metric control...

    Started by RuudM123‎, 06-19-2012 01:59 PM
    • Replies: 0
    • Views: 1,510
    06-19-2012, 01:59 PM Go to last post
  29. Regression - OLS and GLS

    Hi All Please help me to solve regression by OLS and GLS in MATLAB ?

    Started by gauravpuri.bits‎, 06-19-2012 07:50 AM
    • Replies: 1
    • Views: 1,968
    06-19-2012, 10:55 AM Go to last post
  30. For the love of God please click on this and help me - REML mixed models

    I am doing a behavioural masters (due in a week). Basically there are about 20 behaviours which are recorded over 15 mins (900 seconds) and these are...

    Started by qqq‎, 06-19-2012 03:45 AM
    • Replies: 0
    • Views: 703
    06-19-2012, 03:45 AM Go to last post
  31. Linear regression?????

    Can I still treat my regression as being linear if one of the independent variables is a dummy with 3 categories or does it become an...

    Started by Ann91‎, 06-17-2012 07:27 AM
    • Replies: 0
    • Views: 1,305
    06-17-2012, 07:27 AM Go to last post
  32. Hierarchical Regression

    Hi, I need to perform hierarchical regression and include in the models independent variables (some interval and some dummy variables), moderator...

    Started by milehigh899‎, 06-16-2012 08:58 PM
    • Replies: 5
    • Views: 2,320
    06-16-2012, 10:27 PM Go to last post
  33. WLS Regression Weights

    I am working on a problem for which I need to do a multiple regression that involves a dependent variable and two independent variables. The...

    Started by elanmorin‎, 06-16-2012 02:08 PM
    • Replies: 0
    • Views: 3,322
    06-16-2012, 02:08 PM Go to last post
  34. Wink Regression with sqrt transformed dependent variable - meaning of the model's B value?

    Hi fellow nerds :) My dependent variable had to be transformed by square root (so the residual plot would be normal). I usually use log10...

    Started by Stats_Idiot‎, 06-14-2012 05:39 AM
    dependent, regression, sqrt, square root, transformation
    • Replies: 3
    • Views: 10,546
    06-16-2012, 12:28 PM Go to last post
  35. Linear regression: multiple independents?

    Hello all you nice people! It's been such a long time since I used SPSS, but I now I have to analyse my data and I have very little time so I'm a...

    Started by alarmclocks‎, 06-16-2012 07:26 AM
    • Replies: 0
    • Views: 1,539
    06-16-2012, 07:26 AM Go to last post
  36. Vuong test

    Dear, I am trying to perform a Vuong-test to compare a Two-Step Heckman approach to a Double Hurdle approach. The paper of Humphreys...

    Started by Tiboo‎, 06-16-2012 04:46 AM
    • Replies: 0
    • Views: 4,711
    06-16-2012, 04:46 AM Go to last post
  37. Smile interaction testing with sample

    Hi, I have a question regarding my multiple regression analyses. I have a very small sample (30) so i can not include too many Independent...

    Started by mieke222‎, 06-12-2012 07:30 AM
    • Replies: 1
    • Views: 1,717
    06-15-2012, 07:17 AM Go to last post
  38. probit regression with skewed data set

    Hi, I have data from a household survey done in urban and rural areas. The sample size was not the same for both areas. if I combine both data...

    Started by hamnah‎, 06-14-2012 03:24 AM
    • Replies: 1
    • Views: 4,030
    06-14-2012, 04:40 PM Go to last post
  39. Hierarchical regression with dummy variables

    Hi, I need to perform hierarchical regression with dummy variables. I also need to check moderation by introducing in the model interactions of...

    Started by milehigh899‎, 06-14-2012 01:32 PM
    • Replies: 0
    • Views: 1,770
    06-14-2012, 01:32 PM Go to last post
  40. Proportion of Variance?

    Hey guys, I'm helping my child out with their statistics homework and we cannot figure out these problems. Is there any chance that someone could...

    Started by MsBella516‎, 06-13-2012 08:17 PM
    • Replies: 0
    • Views: 2,026
    06-13-2012, 08:17 PM Go to last post
  41. Sigmoid curve

    Hi, Is it possible to linearise data for a sigmoid curve? To be clear, I do not mean a logistic function! The data are not between 0 and 1! I...

    Started by rmoerken‎, 06-04-2012 07:31 AM
    • Replies: 8
    • Views: 4,353
    06-12-2012, 04:39 PM Go to last post
  42. Logisitic regression with ranked independent variables

    Hi all, This is my first post, so be gentle. I have the following type of data: ----------------------------- Data Set-1 DV......

    Started by zompano‎, 06-12-2012 04:36 PM
    • Replies: 0
    • Views: 2,392
    06-12-2012, 04:36 PM Go to last post
  43. Multiple regression, interaction, small sample

    Hi, I have a question regarding my multiple regression analyses. I have a very small sample (30) so i can not include too many Independent...

    Started by mieke222‎, 06-12-2012 07:32 AM
    • Replies: 0
    • Views: 1,077
    06-12-2012, 07:32 AM Go to last post
  44. Using Weight Of Evidence (WOE) in scoring

    Hi, I'm a newcomer to scorecards and I am trying to build one by performing univariate analysis to test for predictive strength of each of my...

    Started by RichH6109‎, 06-12-2012 07:04 AM
    • Replies: 0
    • Views: 3,302
    06-12-2012, 07:04 AM Go to last post
  45. Question Logistic Regression: Include constant in the model or not?

    Hi! 1. Could anybody give me a detailed explanation about why is inappropriate not to use a constant in a logistic regression model? Could you...

    Started by neuroscientist‎, 06-11-2012 09:22 PM
    • Replies: 5
    • Views: 13,102
    06-12-2012, 06:08 AM Go to last post
  46. [R] How to calculate Confidence Interval for a prediction using Partial Regression?

    Dear all, I have two highly correlated variables (y and x), and both of them depend on a third variable (A, for Area). Multiple regression...

    Started by Dani DQ‎, 06-11-2012 06:15 PM
    • Replies: 0
    • Views: 1,665
    06-11-2012, 06:15 PM Go to last post
  47. Logistic regression as a purchase predictor - purchases per variable?

    I've been using logistic regression on a web log data set to predict likelihood to purchase for each customer. I have a number of variables for each...

    Started by sheridan215‎, 06-11-2012 04:12 PM
    logistic regression
    • Replies: 1
    • Views: 1,718
    06-11-2012, 05:29 PM Go to last post
  48. LME in SPSS and R giving different results

    I am trying to do a linear mixed model in both SPSS and R ... well, more precisely, originally I did it in SPSS, but now I want to use resampling to...

    Started by baixiwei‎, 06-08-2012 09:21 PM
    • Replies: 6
    • Views: 5,361
    06-11-2012, 04:31 PM Go to last post
  49. Continuous Moderator and DV and categorical IV (dummy coded) Help please!!!

    I ran an experiment recently and now I'm trying to work out whether either of the covariates (anxiety or avoidance) interact with the effect of any...

    Started by LoopyLou‎, 06-11-2012 10:55 AM
    • Replies: 1
    • Views: 4,286
    06-11-2012, 03:28 PM Go to last post
  50. Multiple imputation for missing data or not????

    Dear all, I am doing multivariate logistic regression analysis. Among the 8 independant variables, I have 2 with a lot of missing data (around 20%...

    Started by Missingdata‎, 06-11-2012 08:44 AM
    • Replies: 2
    • Views: 1,666
    06-11-2012, 09:39 AM Go to last post
  51. Validation of logistic regression algorithm

    Hi, I'm new in machine learning and logistic regression area, and in MATLAB area, too. I'm doing logistic regression in machine learning. Until...

    Started by la_luna‎, 06-11-2012 03:53 AM
    • Replies: 0
    • Views: 1,073
    06-11-2012, 03:53 AM Go to last post
  52. Refining a structural equation model

    I am wondering if someone can please help me. I am completing some structural equation modeling with 400 complete cases (within the model there...

    Started by aussie‎, 06-11-2012 01:47 AM
    • Replies: 0
    • Views: 917
    06-11-2012, 01:47 AM Go to last post
  53. Formerly non-significant main effect becomes significant after interaction is entered

    Hi there, I'm running a hierarchical regression with 3 IVs. First step: main effects, second step: two-ways, third step: three-ways. In the first...

    Started by rsk‎, 06-10-2012 03:32 PM
    interaction effects, main effects
    • Replies: 0
    • Views: 1,720
    06-10-2012, 03:32 PM Go to last post
  54. Simple regerssion

    I am new to stats and this may be very easy for Seniors. In my regression analysis I want to find, how “% change” is affected by other variables, the...

    Started by amandeepsharma89‎, 06-04-2012 04:23 PM
    regression analysis
    • Replies: 12
    • Views: 2,132
    06-10-2012, 02:17 PM Go to last post
  55. Question Comparing betas between two separate models

    I have a linear regression model and results for 2001, and 2008. A particular predictor (unemployment rate) is significant in both models (p=0.000)....

    Started by cbaldwin‎, 06-06-2012 11:24 PM
    • Replies: 1
    • Views: 1,569
    06-10-2012, 04:33 AM Go to last post
  56. Expressing the sum of squared residuals as a matrix

    R, the n by 1 matrix of residuals, is given by y_i, an n by 1 matrix, minus X, an n by 2 matrix consisting of explanatory variables x_1 and x_2(where...

    Started by lm8ub‎, 06-06-2012 08:03 PM
    • Replies: 2
    • Views: 3,768
    06-09-2012, 09:24 PM Go to last post
  57. Multiple regression and correlation matrix

    Hi. I got some data I am about to present in a report. At first I created a correlation matrix, and there was no statistical significant...

    Started by stinestalker‎, 06-06-2012 02:54 PM
    • Replies: 2
    • Views: 3,449
    06-09-2012, 09:17 PM Go to last post
  58. Imputing missing values, and simulating the dependent variable in a regression

    Hi all, I've been working on filling in some missing income values in a data set using multiple imputation. To check the validity of my model, I...

    Started by eyesack_kn‎, 06-08-2012 05:08 PM
    • Replies: 0
    • Views: 2,588
    06-08-2012, 05:08 PM Go to last post
  59. Simple question regarding the OLS procedure...

    If I understand this equation correctly, if the transpose of x_i is an n by 2 matrix, then is the matrix x_i a 2 by n matrix? But isn't that a weird...

    Started by lm8ub‎, 06-06-2012 10:50 AM
    • Replies: 4
    • Views: 1,725
    06-06-2012, 11:43 AM Go to last post
  60. Question cohort regression analysis?

    Is a multiple regression analysis a good test for cohort or even nested cohort? Dependent variable is LDL cholesterol binomial YES?NO? for LDL 240 or...

    Started by Maureen‎, 06-06-2012 11:24 AM
    • Replies: 0
    • Views: 1,464
    06-06-2012, 11:24 AM Go to last post

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