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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Linear mixed model without random or repeated effects? GLMZ?

    Hi, I'm working on a dissertation, of which many chapters have longitudinal data and I've been using linear mixed models to estimate growth. I...

    Started by jcs691‎, 04-21-2011 09:12 PM
    generalized linear model, growth model, lmm, mixed models, multilevel model
    • Replies: 1
    • Views: 3,085
    04-22-2011, 10:18 AM Go to last post
  2. Multiple Regression: Help to prove SD Beta 3 minus Beta 4

    Hi I've been having a lot of trouble with this problem. How do I show that; SD_Beta3 - Beta4 = √(Var(Beta_3)+Var(Beta_4)-2Cov(Beta_3, Beta_4))...

    Started by sykes87‎, 04-21-2011 12:06 PM
    variance for rv sum
    • Replies: 4
    • Views: 2,764
    04-21-2011, 05:57 PM Go to last post
  3. Easy Questions: Simple regression

    Hi, I have three questions for you on which I have issues: Should I use correlation test or simple regression: that "ratio data" is...

    Started by Robjam‎, 04-21-2011 07:55 AM
    • Replies: 3
    • Views: 2,813
    04-21-2011, 03:51 PM Go to last post
  4. Error Propagation in Multivariable Regression

    I've spent all day reading Matlab tutorials and can't seem to find anything about propagating error in regression analysis. I have a set of x and y...

    Started by lizakova‎, 04-20-2011 05:41 PM
    • Replies: 0
    • Views: 2,976
    04-20-2011, 05:41 PM Go to last post
  5. Multiple regression test of significance using r squared

    I have a multiple regression with 5 independent variables, and obtained the r^2. Then I removed two IVs, and get the R^2 for the reduced model with...

    Started by mattc‎, 04-19-2011 01:47 PM
    • Replies: 4
    • Views: 9,761
    04-19-2011, 05:06 PM Go to last post
  6. Weighted Least Squares & VIF - SPSS questions

    I was hoping someone could help me understand a problem I am having. I frequently use weighted least squares, however I do not estimate the weights...

    Started by AnalystNYC‎, 04-19-2011 10:17 AM
    • Replies: 0
    • Views: 4,149
    04-19-2011, 10:17 AM Go to last post
  7. complex survey analysis and weight variables in proc surveylogistic

    I am analyzing the effect of Calcium on Obesity in adults based on the NHANES dataset. I have two questions. First, since I am combining two day...

    Started by sabina9‎, 04-18-2011 10:26 AM
    • Replies: 1
    • Views: 4,155
    04-18-2011, 11:05 AM Go to last post
  8. Interaction Between Quadratic Variables in Logistic Regression

    Hi, I got some questions about assumption and interpretation of conditional logistic regression. It seems that two of my variables (let says N and...

    Started by STG‎, 04-18-2011 07:42 AM
    • Replies: 0
    • Views: 3,371
    04-18-2011, 07:42 AM Go to last post
  9. Regression with latent variable

    Hi, I'm doing some research for my dissertation and need to construct a latent variable that includes observations of various economic...

    Started by Swede159‎, 04-15-2011 11:01 AM
    latent variable
    • Replies: 3
    • Views: 7,014
    04-17-2011, 01:11 PM Go to last post
  10. Moderated Multiple Liner Regression

    Hey, I'm doing some research on the sensitivity of executive compensation (DP) to a set of economic determinants (IV). The main part of my...

    Started by Swede159‎, 04-08-2011 07:17 AM
    • Replies: 1
    • Views: 2,475
    04-17-2011, 12:20 AM Go to last post
  11. regression with categorical predictor

    Hi people, i have a problem which i could not solve myself, maybe somebody can help me. i have three groups (A/A, A/B and B/B) and a continuous...

    Started by muraveinik‎, 04-11-2011 01:14 PM
    • Replies: 1
    • Views: 3,285
    04-17-2011, 12:02 AM Go to last post
  12. Logit Equation - fitting the quadratic

    Hi, I posted a question in the main stats forum, but basically, I wondered if anyone knows the formula to fit the quadratic to the logit equation?...

    Started by Knockout‎, 04-16-2011 05:08 AM
    • Replies: 1
    • Views: 3,115
    04-16-2011, 11:48 PM Go to last post
  13. working correlation matrix to use in generalized estimating equations

    I have a design with a between-subject variable (emotion) and within-subject variable (task type), and response data were binary (answer to a task:...

    Started by Yue‎, 04-15-2011 02:41 PM
    • Replies: 0
    • Views: 3,638
    04-15-2011, 02:41 PM Go to last post
  14. proof:variance

    Hi, I want to find the variance of coeffiicient b(beta) in a regression without constant term(no intercept).I am not ]with variance algebra. I...

    Started by economit‎, 04-15-2011 08:21 AM
    • Replies: 2
    • Views: 4,862
    04-15-2011, 09:27 AM Go to last post
  15. Question Time series or just repeated measures?

    Hi All, I have data on 7 clusters (ie, sites). The date are monthly counts (there is no zero inflation in most of the outcomes of interest...most...

    Started by SabbyATL‎, 04-14-2011 09:14 PM
    clusters, count data, repeated measures, time series
    • Replies: 0
    • Views: 2,974
    04-14-2011, 09:14 PM Go to last post
  16. Johansen Cointegration test issue

    Hello, Let me describe the issue: I have a vector of four time series, each component of which is I(1). When I put the four series into a matrix...

    Started by LostInNY‎, 04-14-2011 05:00 PM
    cointegration, johansen
    • Replies: 0
    • Views: 2,264
    04-14-2011, 05:00 PM Go to last post
  17. Factor in binary logistic regression?

    Hi, I am currently performing a binary logistic regression, with a number of predictors. The aim is to measure the relationship between the...

    Started by blastStu‎, 04-10-2011 06:07 AM
    • Replies: 1
    • Views: 3,259
    04-13-2011, 02:47 AM Go to last post
  18. Discrete regression

    What is the/an appropriate regression technique to use where the dependent variables are discrete labels. For example, I have predicted survival...

    Started by marius1‎, 04-12-2011 11:59 AM
    • Replies: 0
    • Views: 2,408
    04-12-2011, 11:59 AM Go to last post
  19. Unhappy Mean Squared Prediction Error?

    Hi, I am having trouble understanding how to use MSPE. Let's say I have 30 data points and then a sample of 4 of them is selected (the 'test...

    Started by TheFirstOrder‎, 04-12-2011 10:50 AM
    • Replies: 0
    • Views: 3,717
    04-12-2011, 10:50 AM Go to last post
  20. Help needed with contrasts for 2by2byTime regression analysis in SPSS mixed

    I have 2 categorical variables with both 2 levels, for which I also want to estimate the interaction effect. I have used effect coding for these two...

    Started by esmee‎, 04-12-2011 07:49 AM
    • Replies: 0
    • Views: 2,599
    04-12-2011, 07:49 AM Go to last post
  21. Link function

    Hi all, I've never really understood the concept of "link functions". Is anyone able to point me in the right direction of something that could...

    Started by duskstar‎, 04-12-2011 03:18 AM
    • Replies: 1
    • Views: 2,996
    04-12-2011, 05:51 AM Go to last post
  22. Variable selection for multiple regression analysis

    Hi everybody there. I want to correlate 2 main variables (say "a" Dependant and "b" independent of course) BUT at the same time i want to add 5 other...

    Started by mzalikhan@gmail.com‎, 04-10-2011 10:07 PM
    multiple regression, variable selection
    • Replies: 2
    • Views: 3,960
    04-11-2011, 06:08 PM Go to last post
  23. Interpretation of Loglinear model

    Hi All, I am performing a regression analysis through a log linear model. But I am not able to effectively interpret the coefficient of the...

    Started by sach_83‎, 04-09-2011 05:43 PM
    • Replies: 2
    • Views: 15,664
    04-10-2011, 01:17 AM Go to last post
  24. help with Linear regression with nfl stats please

    Hey guys, just wondering if I could get some help with the best way to use my data. After the challenge system was introduced into the nfl in 1999...

    Started by rbskee‎, 04-08-2011 09:41 AM
    • Replies: 3
    • Views: 4,308
    04-09-2011, 01:19 AM Go to last post
  25. regression and correlation

    Hello, correlation between two variables is positive (and significant) and then when I put it in regression analysis it becomes negative predictor...

    Started by Vanja‎, 04-08-2011 03:09 AM
    • Replies: 1
    • Views: 3,316
    04-08-2011, 05:15 AM Go to last post
  26. R^2 vs AIC paradox?

    Hi Everyone, I have the following situation which has me a bit puzzled. I've fitted two different linear models to a data set and would like to...

    Started by alfredman‎, 03-28-2011 07:07 AM
    • Replies: 13
    • Views: 16,195
    04-07-2011, 11:10 PM Go to last post
  27. Help with Mutiple Regression Analysis

    Hello, I am doing my dissertation on Racial differences in Stigma related attitudes towards mentall illness. I have 200 participants, 120 from...

    Started by katerine75‎, 03-30-2011 05:24 PM
    • Replies: 4
    • Views: 3,035
    04-07-2011, 08:50 PM Go to last post
  28. Linear Regression Coefficient and Multiple Regression Coefficient

    Hello Folks: When you use just 2 variables for regression and then when you use the same 2 variables plus an additional 2 other independent...

    Started by jintu7977‎, 04-02-2011 10:10 PM
    omitted variable bias
    • Replies: 3
    • Views: 8,443
    04-07-2011, 08:48 PM Go to last post
  29. Transformation of Data - NO linearity!

    PROBLEM >>>>>>>>> The savings rate (personal savings/disposible income) and per capita disposible income (DPI) are listed for the 50 countries...

    Started by recursive1990‎, 04-01-2011 12:07 PM
    • Replies: 2
    • Views: 3,473
    04-07-2011, 01:17 AM Go to last post
  30. what is cross section regression analysis?

    Can someone help me by defining what is cross section regression analysis and the limits of this. :)

    Started by danswe3‎, 03-29-2011 04:33 AM
    • Replies: 1
    • Views: 22,057
    04-06-2011, 12:40 PM Go to last post
  31. Repeat sales regression help

    Hello everyone, I am in need of any help or guidance working on a repeat sales regression using spss. I am doing a repeat sales index on housing...

    Started by Concepts003‎, 04-05-2011 04:36 PM
    • Replies: 0
    • Views: 4,867
    04-05-2011, 04:36 PM Go to last post
  32. Testing interaction effects

    I had a few question regarding the testing of interactions. First, should I be centering my variables using the mean and/or standardizing my...

    Started by psychcounsel84‎, 04-04-2011 05:27 PM
    • Replies: 2
    • Views: 4,015
    04-05-2011, 03:15 PM Go to last post
  33. Generalized Cross Validation

    Hello Guys, I'm runing MATLAB code on SVD with roughness penalties. When I use GCV to choose the parameter, I have a question regarding the...

    Started by FantasyCC‎, 04-05-2011 08:04 AM
    • Replies: 0
    • Views: 3,304
    04-05-2011, 08:04 AM Go to last post
  34. Hosmer-Lemeshow

    Hi! How do you discussion the vaule for the Hosmer-Lemeshow goodness of fitt in a logistic regression? I tha value 0,290 bad? Regards!

    Started by igolonte‎, 03-30-2011 07:25 AM
    • Replies: 7
    • Views: 9,331
    04-04-2011, 07:24 AM Go to last post
  35. Logistic Regression - Residual Deviance > Residual Df

    Hi There I'm doing a logistic regression on a set of data with 753 groups of observations (although some groups just have one observation). In...

    Started by uzuria‎, 03-28-2011 08:31 AM
    • Replies: 3
    • Views: 9,152
    04-03-2011, 08:08 AM Go to last post
  36. Help with repeated measures analyses

    Hi everyone It is my first posting in this forum so hope I am not asking something that has been answered lots. I am trying to analyses a...

    Started by Maxine‎, 04-03-2011 03:08 AM
    • Replies: 0
    • Views: 2,170
    04-03-2011, 03:08 AM Go to last post
  37. Business Stats, regression

    Hey everyone, Does anyone know the steps that minitab or any other stats software does to eliminate variables when doing forward selection,...

    Started by alias‎, 04-01-2011 05:37 PM
    • Replies: 0
    • Views: 3,313
    04-01-2011, 05:37 PM Go to last post
  38. Logistic Regression with too many IV

    Hi Guys, What would you do, if you had to build a logistic regression model, where you have 500 (!!) independent variables... ? Any manual best...

    Started by WeeG‎, 03-27-2011 02:15 PM
    • Replies: 11
    • Views: 6,855
    04-01-2011, 12:45 PM Go to last post
  39. non-nested models in multilevel analysis

    Hi, I have a question on multilevel analysis. I'm reading a book by Kreft & de Leeuw (Introducing Multilevel Analysis). They give an example for a...

    Started by alex92‎, 03-31-2011 08:15 AM
    • Replies: 1
    • Views: 3,775
    03-31-2011, 10:37 AM Go to last post
  40. Post Can someone please help me set up regression analysis

    I am a master's student in Environmental Management and have conducted a stated preference experiment in which I presented respondents with two...

    Started by rtd212‎, 03-30-2011 10:36 AM
    regression analysis
    • Replies: 0
    • Views: 2,640
    03-30-2011, 10:36 AM Go to last post
  41. Logistic transformation - please help with the use of scientific calculator

    Hi there, I believe I have a trivial question. I am studying logistic regression and trying to understand how the values are transformed - e.g ...

    Started by Sylviastat‎, 03-29-2011 01:57 PM
    • Replies: 4
    • Views: 3,927
    03-29-2011, 05:34 PM Go to last post
  42. what does the parameter a and b mean?

    I have worked out the regression equation Y= 12559.7477 + 4265.7566X What does 12559.7477 and 4265.7566X mean? Is 12559.7477 the y-intercept...

    Started by danswe3‎, 03-29-2011 04:54 AM
    • Replies: 0
    • Views: 2,335
    03-29-2011, 04:54 AM Go to last post
  43. Ordinal regression vs Linear regression

    Here's the situation: I have a categorical dependent variable (3 categories), and 3 continuous explanatory variables. Say I perform an ordinal...

    Started by annie_81‎, 03-29-2011 02:02 AM
    • Replies: 0
    • Views: 4,263
    03-29-2011, 02:02 AM Go to last post
  44. Robust regression

    Hi, I am trying to use robust regression instead of ordinary least squares since my data set has a lot of outliers but I don't know if I have...

    Started by akhil123‎, 03-28-2011 09:18 PM
    • Replies: 0
    • Views: 4,165
    03-28-2011, 09:18 PM Go to last post
  45. Does the intercept p value matter?

    Hi, I have outputs of a simple linear model as follows: y = 0.0339 + 0.27918X The p value of the intercept is 0.206 and of the slope is...

    Started by anglais428‎, 03-08-2011 06:48 AM
    intercept p value
    • Replies: 4
    • Views: 50,858
    03-28-2011, 08:14 PM Go to last post
  46. Model specification for Pooled Panel Regression

    I am doing a research on the diversification potential of microfinancial assets. The methodology I use is a mean variance spanning test. I have to...

    Started by sebneedhelp‎, 03-26-2011 12:59 PM
    • Replies: 1
    • Views: 6,868
    03-27-2011, 09:06 PM Go to last post
  47. Please help, how do i interpret this?

    okay the regression formula that i have worked out is y=12559.7477 + 4265.7566X i have to discuss the size, sign, significance and meaning of this. I...

    Started by danswe3‎, 03-26-2011 04:09 PM
    • Replies: 1
    • Views: 6,135
    03-27-2011, 08:49 PM Go to last post
  48. Regression Variable (Only Applicable to Certain Cases)

    Hi, I'm doing a multiple linear regression. One of the variables I am using is a continuous numerical variable, however, it only applies to about...

    Started by StatsStacey‎, 03-26-2011 11:43 AM
    • Replies: 1
    • Views: 3,001
    03-27-2011, 08:47 PM Go to last post
  49. is this model misspecified

    i'm doing a regression on size of company (x) to explain revenue multiple (y). i'm using the companies' revenues and divide them into 5 groups...

    Started by ble21ach‎, 03-23-2011 11:20 PM
    • Replies: 3
    • Views: 2,745
    03-25-2011, 11:12 PM Go to last post
  50. Exclamation Please Help! Don't know which model to use

    Hello, I'm not sure which model to use, I'm guessing it is some type of regression. If you could help, I'd greatly appreciate it! The problem...

    Started by bobart261‎, 03-16-2011 10:36 PM
    likelihood, probability, regression
    • Replies: 2
    • Views: 2,437
    03-25-2011, 11:07 AM Go to last post
  51. Regression using Panel Data. Did I do it right?

    Sorry I did it wrong!

    Started by Ledge‎, 03-24-2011 02:54 PM
    • Replies: 2
    • Views: 4,347
    03-25-2011, 07:20 AM Go to last post
  52. Logistic regression question

    Hi everyone, I have a question regarding an exercise on Gujarati's "Basic Econometrics" (exercise 15.2 p.625 4th edition). In this exercise we are...

    Started by ddrebelo‎, 03-25-2011 05:47 AM
    • Replies: 0
    • Views: 2,127
    03-25-2011, 05:47 AM Go to last post
  53. Same point of a graph? Novice needs guidance!

    Dear All, I'm a BSc student currently involved in materials testing. In several of my tests I am getting a graph plotting extension(mm) vs....

    Started by Apprentice‎, 03-24-2011 04:45 PM
    • Replies: 1
    • Views: 2,382
    03-24-2011, 05:15 PM Go to last post
  54. Regression analysis for a cross sectional study

    Good morning all. I am supposed to perform a regression analysis for a crossectional survey, using STATA. The thing is i dont know where to...

    Started by nostatisticsgirl‎, 03-24-2011 12:14 AM
    • Replies: 0
    • Views: 5,631
    03-24-2011, 12:14 AM Go to last post
  55. Need Help Choosing a Textbook

    Hi, I'm looking for a textbook/book to let me self-study regression analysis. Some background: I have a research psych background...

    Started by trebonus‎, 03-23-2011 10:13 AM
    regression, regression analysis, self-study, textbook
    • Replies: 0
    • Views: 1,835
    03-23-2011, 10:13 AM Go to last post
  56. Regression in First and Second Differences

    I am running a regression in STATA to determine if temperature effects natural gas production in Russia and I am including the following variables...

    Started by lxh5027‎, 03-21-2011 10:23 PM
    dfuller, first difference, regression, second difference
    • Replies: 3
    • Views: 17,055
    03-22-2011, 05:45 PM Go to last post
  57. Lightbulb Spanning test with short sales constraints - how does it works?

    Dear all, I need to perform a spanning test with short sales constraint to assess the diversification potential of microfinancial assets. I red...

    Started by sebneedhelp‎, 03-21-2011 01:55 PM
    • Replies: 0
    • Views: 2,954
    03-21-2011, 01:55 PM Go to last post
  58. Removing insignificant variables

    Say I'm plotting a multivariate regression with five variables, and three of them come up statistically insignificant. Why is it important to try...

    Started by constantly‎, 03-20-2011 04:51 PM
    • Replies: 2
    • Views: 7,525
    03-21-2011, 01:49 AM Go to last post
  59. Nonlinear Regression for the P/PE of the S&P 500??

    Hello All, Iím hoping that someone can help me figure out what regression model I should be using. I donít think that a linear regression model...

    Started by Turkish721‎, 03-16-2011 01:44 PM
    • Replies: 1
    • Views: 3,778
    03-20-2011, 04:54 PM Go to last post
  60. Regression results

    Hello! I need help with the results of regression analysis. I have significant percentage of variance explained (not big, only 5%), but none of...

    Started by Leyla‎, 03-20-2011 05:08 AM
    • Replies: 3
    • Views: 2,897
    03-20-2011, 04:43 PM Go to last post

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