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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. coefficient changes direction with interaction term entered

    Hi I'm running a logistic regression and my first model tests the direct effects of a variable (X) which is initially negative. In the second model...

    Started by dce219‎, 06-11-2011 10:05 AM
    • Replies: 2
    • Views: 7,303
    06-13-2011, 08:47 PM Go to last post
  2. standardized parameters

    Hello, can anyone help me with a brief explanation? Usually I use the "stb" model option while running the proc logistic in sas to calculate the...

    Started by conni‎, 06-14-2011 05:17 AM
    • Replies: 0
    • Views: 3,193
    06-14-2011, 05:17 AM Go to last post
  3. In stepwise regression, can the number of predictors be >n?

    Hi, I'm getting an error when I try to run a stepwise regression with backward elimination - it says there is not enough data in the columns. I...

    Started by l3a9k‎, 06-09-2011 08:35 AM
    • Replies: 7
    • Views: 3,520
    06-14-2011, 07:54 AM Go to last post
  4. Weird results

    Hello, I ran a regression analysis, with 2 IV's. One is highly significant, and explain about 93% of the variance. The second is significant, but...

    Started by NN_STAT‎, 06-15-2011 02:31 AM
    • Replies: 0
    • Views: 1,517
    06-15-2011, 02:31 AM Go to last post
  5. Simple regression question

    Hi. I know most of my basic regression stuff but I forgot one thing. I conducted a regression with 4 independent variables and from my regression...

    Started by c2q‎, 06-12-2011 02:57 PM
    • Replies: 5
    • Views: 2,606
    06-15-2011, 08:06 AM Go to last post
  6. Z-test in NB regression model

    what is the null hypothesis of z-test in negative binomial regression?

    Started by najmehjami‎, 06-12-2011 04:55 PM
    • Replies: 4
    • Views: 3,498
    06-15-2011, 10:54 AM Go to last post
  7. Interaction Term in Logistic Regression

    I'm reading Kutner, et al., Applied Linear Statistical Models (5th), and came across something I don't recall the authors explaining. I vaguely...

    Started by bryangoodrich‎, 06-17-2011 12:07 AM
    • Replies: 8
    • Views: 9,097
    06-17-2011, 05:10 PM Go to last post
  8. Expectation/ Variance/ ACF and PACF in ARMA(2,1)

    Hello guys, I hope I'm not posting in the wrong subforum. I am looking for a solution to calculate E, Var, and ACF and PACF coefficents in an...

    Started by yoz2k3‎, 06-16-2011 05:04 AM
    • Replies: 1
    • Views: 5,480
    06-17-2011, 08:09 PM Go to last post
  9. Cross validation bandwith selection

    Hi, is there a package in R for cross-validation optimal bandwith selection for nonaparemtric regression/autoregression functions estimation? (for...

    Started by Torch‎, 06-18-2011 03:46 AM
    • Replies: 1
    • Views: 3,758
    06-18-2011, 09:52 AM Go to last post
  10. How good is this regression?

    Hi everyone, new here. I am doing some research concerning 'transportation of college students'. I regressed data of student satisfaction as a...

    Started by graphicsgriffin‎, 06-05-2011 04:49 AM
    • Replies: 14
    • Views: 6,885
    06-18-2011, 05:10 PM Go to last post
  11. Logistic regression - help needed

    Hi, I want to predict a dependent variable from a set of (3) factor scores, as independent variables. The problem is that one of those scores...

    Started by Kara‎, 06-18-2011 05:21 AM
    • Replies: 2
    • Views: 4,172
    06-19-2011, 01:42 AM Go to last post
  12. Multiple regression with non-normal distribution?

    I have some data that I would like to analyse by using multiple regression, as I am interested in the predictive ability of a model (variables...

    Started by judith_sw‎, 06-18-2011 04:58 PM
    • Replies: 7
    • Views: 25,261
    06-19-2011, 04:00 AM Go to last post
  13. Chi square and Wald chi square

    What is the difference between wald chi square test and chi square test in regression analysis?

    Started by najmehjami‎, 06-20-2011 10:49 AM
    • Replies: 2
    • Views: 20,964
    06-20-2011, 01:26 PM Go to last post
  14. Help with Normalizing data

    This is my first time posting to this forum, and Im hoping to get some help. I am an engineer, and I have been assigned a project where I need to...

    Started by FishMan‎, 06-19-2011 11:02 PM
    • Replies: 2
    • Views: 2,881
    06-20-2011, 08:11 PM Go to last post
  15. OLS + Serial Correlation + Cochrane-Orcutt Procedure

    Hi Forum Experts, I am working through a OLS regression analysis where there is positive serial correlation in the independent variable over time....

    Started by scienceskillz‎, 06-17-2011 12:44 PM
    • Replies: 2
    • Views: 7,389
    06-20-2011, 08:37 PM Go to last post
  16. Best way to normalize a non linear trend.

    Using a regression performed in Excel, I have data that can be described by the equation y = 4*(x^0.5). The x values range from 1000 to 5000. I...

    Started by FishMan‎, 06-20-2011 09:06 PM
    • Replies: 2
    • Views: 6,070
    06-20-2011, 11:48 PM Go to last post
  17. Including beta coeffiicients in logistic regression

    Dear all, I've posted the same query in the biostatistics section but as it is specific to logistic regression, I thought it a good idea to try...

    Started by tiggerkate‎, 06-19-2011 06:36 AM
    • Replies: 2
    • Views: 2,658
    06-21-2011, 02:41 AM Go to last post
  18. Power calculation in regression for curviliear effect

    Hi! I performed a regresson analysis to test a curvilinear effect. I've followed Aiken & West procedures Center X, Squared centered X ...

    Started by Mariana Ramos‎, 06-21-2011 05:00 AM
    effect size, power, quadratic effect, regression
    • Replies: 0
    • Views: 1,604
    06-21-2011, 05:00 AM Go to last post
  19. error structure

    Could anyone please clarify what does "error structure distribution" in a regression model exactly refer to? I'm trying to relate "number of...

    Started by najmehjami‎, 06-21-2011 09:51 AM
    • Replies: 0
    • Views: 2,598
    06-21-2011, 09:51 AM Go to last post
  20. Non-linear multiregression analysis

    Dear experts, Is anyone knows about non-linear multiregression analysis? Can anyone explain it to me the methods or etc. Is there any reference or...

    Started by srabeah‎, 06-22-2011 03:45 AM
    • Replies: 0
    • Views: 2,257
    06-22-2011, 03:45 AM Go to last post
  21. Confusion over how to calculate regression coefficient

    I'm trying to find the regression coefficient of one set of a data on another. There is a linear relationship between the two sets of data. After a...

    Started by paddyg‎, 06-15-2011 04:32 AM
    • Replies: 6
    • Views: 11,286
    06-22-2011, 01:33 PM Go to last post
  22. Correlation between predictive variables in multiple regression

    I have several response variables which are explained by many different explanatory variables. I have one value for each day for each variable, both...

    Started by steffdov‎, 06-14-2011 08:40 AM
    • Replies: 1
    • Views: 2,132
    06-22-2011, 01:46 PM Go to last post
  23. A query related to Bayesian Regression

    I had a query related to Bayesian Regression and I was wondering if someone had any ideas : So in the proper Bayesian case, we have the following...

    Started by ardur‎, 06-22-2011 06:42 PM
    noparse
    • Replies: 0
    • Views: 1,702
    06-22-2011, 06:42 PM Go to last post
  24. Factorial design and regression

    Hi All, I need some support on a regression needed for a factorial design. For sake of clarity I have to tell I am a dummy on statistical topic,...

    Started by Rosario Martorana‎, 06-23-2011 03:20 AM
    • Replies: 0
    • Views: 2,636
    06-23-2011, 03:20 AM Go to last post
  25. Cross check the regression equation correctness

    People, i have this problem From the following data obtain the two regression equations Sales 06 02 10 04 08 Purchase09 11 05 08 07 i...

    Started by raviepic3‎, 06-23-2011 01:09 PM
    check answer, regression equation
    • Replies: 0
    • Views: 1,717
    06-23-2011, 01:09 PM Go to last post
  26. Sample Size Calculation for Multiple Regression

    Hi Everyone, I would like to apologize in advance for the question below, but my level of knowledge in statistics is mediocre at best. I am...

    Started by mikeme‎, 06-23-2011 01:50 PM
    • Replies: 2
    • Views: 3,632
    06-23-2011, 02:38 PM Go to last post
  27. Sphericity

    Hi! I'm Planning on running a simulation, and one of my conditions I'm varying is whether a set of variables Meet the sphericity assumption in a 1...

    Started by jamesmartinn‎, 06-24-2011 11:40 AM
    • Replies: 3
    • Views: 2,714
    06-24-2011, 11:59 AM Go to last post
  28. about control variable

    Dear All, I have a question here. when I put control my variable in my multiple regression in spss, why the result is the same as that of no...

    Started by wohu‎, 06-08-2011 01:06 AM
    • Replies: 2
    • Views: 2,321
    06-24-2011, 02:04 PM Go to last post
  29. Interpreting hree way interactions

    I'm trying to interpret two significant three-way interactions. I've used hierarchical regression to analyse my data, and I have come up with two...

    Started by sloppy‎, 06-25-2011 01:14 AM
    interaction
    • Replies: 0
    • Views: 2,261
    06-25-2011, 01:14 AM Go to last post
  30. Transform data to Ln

    I have a research and I use regression to analyze my data. first I input my datumn in spss and analyze those with regression. the result is all of...

    Started by meyzy‎, 06-25-2011 02:30 AM
    • Replies: 0
    • Views: 2,852
    06-25-2011, 02:30 AM Go to last post
  31. Logarithmic regression in SPSS

    Hi, does anyone know how to use non-linear logarithmic regression in SPSS? I have one DV and one IV. Thanks

    Started by graphicsgriffin‎, 06-27-2011 10:39 AM
    • Replies: 0
    • Views: 6,281
    06-27-2011, 10:39 AM Go to last post
  32. R squared value and type of regression

    Hi. I am doing regression in Excel between two factors. I am getting r squared value as follows: 0.435 when choosing linear 0.443 when choosing...

    Started by graphicsgriffin‎, 06-22-2011 03:23 PM
    • Replies: 6
    • Views: 7,405
    06-27-2011, 10:46 AM Go to last post
  33. I am getting very vey small p-values. Is it normal?

    Hi. I am doing correlations and linear regressions and getting p-values as small as 2 E -40 Is it normal? and what does it mean? Thanks a lot.

    Started by graphicsgriffin‎, 06-27-2011 04:30 PM
    • Replies: 1
    • Views: 3,005
    06-27-2011, 04:43 PM Go to last post
  34. Question obtaining β(hat)s from weighted least square regression

    I'm doing Regression analysis under stratified random sampling for my research since it's usually assumed in many textbooks that the data is simple...

    Started by heystar‎, 06-27-2011 11:06 PM
    regression, stratified sampling, weights
    • Replies: 0
    • Views: 60,992
    06-27-2011, 11:06 PM Go to last post
  35. Collinearity help

    I saw a suggestion on a web page for dealing with collinearity I had not seen before. http://www2.chass.ncsu.edu/garson/pa765/tacq.htm "Treat...

    Started by mishery‎, 10-25-2005 11:56 AM
    • Replies: 5
    • Views: 5,910
    06-28-2011, 07:51 AM Go to last post
  36. Question Coefficient of Determination

    Hi there, I'm using non-linear regression (specially I'm using neural networks for time series prediction) and I'm a bit unsure about the...

    Started by Pooven‎, 06-28-2011 05:05 PM
    r squared
    • Replies: 2
    • Views: 4,056
    06-29-2011, 06:14 AM Go to last post
  37. Alternative to Hausman test? Fixed-/Random-Effects with robust SEs

    Hi everyone! After reading loads and loads of material about tests, I have still not been able to come up with a satisfying solution to my probem....

    Started by plotz‎, 06-29-2011 10:59 AM
    • Replies: 0
    • Views: 3,588
    06-29-2011, 10:59 AM Go to last post
  38. Is this method to compare F value correct?

    Hi. I am getting this result for my regression showing the F value. I used this website to calculate the critical-F value and compared it to...

    Started by graphicsgriffin‎, 06-30-2011 01:57 PM
    • Replies: 4
    • Views: 5,113
    07-01-2011, 04:19 PM Go to last post
  39. Curve estimation command in SPSS to help determine type of regression?

    Hi everyone, will the curve estimation command in SPSS help me in determining the type of regression? For example, I am doing regression between...

    Started by graphicsgriffin‎, 07-01-2011 04:33 PM
    • Replies: 0
    • Views: 7,376
    07-01-2011, 04:33 PM Go to last post
  40. interaction in logistic regression

    Hi, I have run a moltinomial logistic regression and wanted to test for moderation effects of some variables so I tested the model with main effects...

    Started by Sciarada‎, 06-30-2011 08:48 PM
    interaction effect, likelihood ratio test, logistic regression
    • Replies: 10
    • Views: 5,313
    07-01-2011, 08:03 PM Go to last post
  41. Regression models with pre and post tests

    I'd like to use a path analysis for N=37 with three exo. variables, i.e., R, M, S? I don't use a latent variable in my model, and wonder if the N>200...

    Started by Sencer Corlu‎, 07-02-2011 05:48 AM
    • Replies: 0
    • Views: 3,488
    07-02-2011, 05:48 AM Go to last post
  42. which model to use ?

    Hello Guys, I have a little problem that needs to be solved in statistical way. I have a sensor, that when comes in interaction with some gas,...

    Started by NN_STAT‎, 07-03-2011 04:02 AM
    • Replies: 0
    • Views: 1,489
    07-03-2011, 04:02 AM Go to last post
  43. Can I compare models like this ?

    Hi, I was trying to fit a linear regression model (simple), for a set of data that shows a very strong linear relation between X and Y. Linearity...

    Started by NN_STAT‎, 07-05-2011 12:53 AM
    • Replies: 3
    • Views: 1,856
    07-05-2011, 01:46 AM Go to last post
  44. Categorical predictors in multiple regression

    Hi, I have a question my thesis advisor cant help with. I'm trying to test the hypothesis that ambivalence towards eating meat is moderated by...

    Started by Pachy‎, 07-05-2011 05:14 PM
    • Replies: 1
    • Views: 2,057
    07-05-2011, 06:35 PM Go to last post
  45. All possible sub-sets regression in SPSS

    Hi there, I’d like to do an “all possible sub-sets” regression analysis in SPSS with six parameters to model my dependent vbl, but am not very savvy...

    Started by l3a9k‎, 07-06-2011 01:43 PM
    • Replies: 0
    • Views: 2,891
    07-06-2011, 01:43 PM Go to last post
  46. Co-efficient interpretation in Gamma Regression Model

    Hi Guys, I am trying to fit a gamma regression model using a log link model. Now, I get a negative co-efficient for one of my IVs. What is the...

    Started by Ancalagon The Black‎, 07-06-2011 01:49 PM
    gamma regression, glm, regression
    • Replies: 0
    • Views: 3,508
    07-06-2011, 01:49 PM Go to last post
  47. Poisson regression problem

    I was doing a Poisson regression for my data. I got a bunch of 0 or 1 (response variable) data and I used GLM in R to fit the model. Then I found...

    Started by choulcc‎, 07-08-2011 10:08 PM
    • Replies: 0
    • Views: 1,978
    07-08-2011, 10:08 PM Go to last post
  48. Multicollinearity and AIC in stepwise regression

    I am trying to run a stepwise regression with backward elimination on a set of water chemistry data in which there's a high degree of...

    Started by l3a9k‎, 06-14-2011 02:40 PM
    • Replies: 12
    • Views: 15,184
    07-09-2011, 11:57 AM Go to last post
  49. Proportional DV (Sounding Board)

    I'm working through a qualitative study around reading strategies that may gain some benifit through quantitative analysis. Set up: 9 teachers...

    Started by trinker‎, 07-11-2011 11:25 AM
    • Replies: 1
    • Views: 1,840
    07-11-2011, 11:40 AM Go to last post
  50. Surface Response Metodolgy: What model should i use for a 2 factor design

    I made a SRM for a chemistry experiment. The factors analyzed were 2 an i had 5 responses. For the model can i use a cubic model or should i use a...

    Started by afsechem‎, 07-11-2011 02:11 PM
    optimization, srm
    • Replies: 0
    • Views: 2,235
    07-11-2011, 02:11 PM Go to last post
  51. Find the affect of introducing a variable into a Data Set

    Good morning, Everyone! I apologize, but I must admit that it's been a few years since I've been engaged in any statistical analysis; that being...

    Started by sapiensgladio‎, 07-11-2011 01:37 PM
    conversion, regression
    • Replies: 3
    • Views: 3,131
    07-11-2011, 08:21 PM Go to last post
  52. stepwise regression with dummy variables

    Hello there, I want to do a stepwise regression in order to find relevant predicting variables, but one of the possible predicting variables is a...

    Started by gilisegall‎, 07-11-2011 01:51 PM
    • Replies: 6
    • Views: 16,390
    07-12-2011, 09:00 AM Go to last post
  53. Help with Regression Analysis

    It's been a while since I've done a regression analysis. I'm trying to run a multivariate regression analysis in Excel to determine whether or not...

    Started by cglinn‎, 07-12-2011 09:31 AM
    • Replies: 9
    • Views: 4,305
    07-12-2011, 04:34 PM Go to last post
  54. Poisson distribution - goodness of fit

    I want to test goodness of fit for poisson distribution for a very large data set (~millions of records). Can anybody suggest a method? All the...

    Started by anujg‎, 07-13-2011 03:57 AM
    chi square, discrete random variables, goodness of fit, large data sets, poisson distribution
    • Replies: 1
    • Views: 2,946
    07-13-2011, 04:20 AM Go to last post
  55. Penalty Analysis

    Hi, how do we interpret the result of penalty analysis having negative mean drop (which is sig) as well as negative penalties (which is also sig)....

    Started by cassandra010666‎, 07-13-2011 08:46 PM
    • Replies: 1
    • Views: 6,937
    07-13-2011, 09:16 PM Go to last post
  56. Moderated regression: correlation between moderator and predictor

    Hi All, my data suggest a significant positive moderation that can be grounded on (somewhat ;)) strong theory. Everything looks fine...

    Started by Wolf_2011‎, 07-14-2011 04:15 AM
    • Replies: 0
    • Views: 3,938
    07-14-2011, 04:15 AM Go to last post
  57. Question: Sample size and regression

    I have a question regarding sample size and regression. First, the following is a general overview of my study: Purpose of Study: To examine the...

    Started by akak‎, 07-14-2011 10:20 PM
    • Replies: 0
    • Views: 3,162
    07-14-2011, 10:20 PM Go to last post
  58. Log-linear Regression Models with only the cell mean, variance, and sample size

    Hi, I am working on a project with a contingency table with provide only the mean, variance, and sample size, but don't have the exact count of...

    Started by cyrus‎, 07-15-2011 01:10 AM
    • Replies: 0
    • Views: 2,061
    07-15-2011, 01:10 AM Go to last post
  59. Multicollinearity

    Hi, I am trying to detect multi-collinearity in my regression model.I ran the Belsley, Kuh, Welsch Variance-decomposition and i saw that for k=607...

    Started by 12345678‎, 07-16-2011 04:39 AM
    • Replies: 0
    • Views: 1,953
    07-16-2011, 04:39 AM Go to last post
  60. How to choose the best predictors when b and beta indicate different predictors.

    Hey everyone, for my thesis I'm investigating the relationship that can exist between the emotion of boredom and interest through the analysis of...

    Started by CĂ©line Stas‎, 07-17-2011 08:33 AM
    • Replies: 1
    • Views: 2,382
    07-17-2011, 10:52 AM Go to last post

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