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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Correlation between reaction time (RT) and accuracy.

    In a two choice task, for each participant, I want to show that the faster is RT, the higher is the probability for incorrect response. Is it...

    Started by Izek‎, 12-24-2011 09:38 AM
    • Replies: 3
    • Views: 3,994
    12-24-2011, 01:23 PM Go to last post
  2. Control variable correlated with binary treatment variable

    This question regards a social program evaluation which involves participants receiving a binary treatment that they self-select into. Some of these...

    Started by agsalomon‎, 12-24-2011 12:16 AM
    • Replies: 0
    • Views: 2,004
    12-24-2011, 12:16 AM Go to last post
  3. Logit coefficients interpretation...

    Logistic regression Number of obs = 1315 LR chi2(32) = ...

    Started by jesse2‎, 12-21-2011 11:49 PM
    • Replies: 2
    • Views: 5,746
    12-22-2011, 05:37 AM Go to last post
  4. Linear Model Prediction

    I'm working on a linear model that looks like: Price = B0 + B1(Gender) + B2(Age) + B3(Credit Type) + B4(Home) ... The predictior is price, and...

    Started by amathew‎, 12-20-2011 05:56 PM
    • Replies: 13
    • Views: 3,261
    12-21-2011, 11:06 AM Go to last post
  5. Stepwise selection and dummy variables

    Hi Can you do forward or backward selection if there are categorical variables involved? If you can, how can it be done? Is there a way to...

    Started by Ipinho100‎, 12-20-2011 10:19 AM
    • Replies: 9
    • Views: 7,119
    12-21-2011, 09:38 AM Go to last post
  6. Exclude intercept in logistic regression?

    I would like some help on the subject whether to include the intercept term or not in a logistic regression. I have read that some people say that...

    Started by jockem‎, 12-20-2011 06:25 AM
    • Replies: 7
    • Views: 21,949
    12-21-2011, 04:00 AM Go to last post
  7. Partialling out covariates

    Hi, I have a situation where I have Y_it = a_i + dT_it + X'_itB + e_it T is multi-valued and exogenous. It is correlated with some of the...

    Started by andrewcd‎, 12-20-2011 10:53 AM
    • Replies: 1
    • Views: 3,269
    12-20-2011, 05:18 PM Go to last post
  8. detecting a variance trend in random effects

    Greetings I have a measurements on grouped individuals. There are approximately 100 groups, and approximately 500 individuals per group, with...

    Started by PSellaz‎, 12-19-2011 02:46 PM
    epidemiology, mixed effects models, multi-level data
    • Replies: 0
    • Views: 1,815
    12-19-2011, 02:46 PM Go to last post
  9. Choosing predictor variables to use in multiple linear regression models

    I want to figure out what combination (both individual variables and interactions, if any) of independent variables predict my dependent variable....

    Started by TreeMan13‎, 12-18-2011 10:08 PM
    • Replies: 2
    • Views: 8,792
    12-18-2011, 11:09 PM Go to last post
  10. dummy varibles

    i have some data where i am trying to see if there is any salarie discrimination in gender between men and women do i need to make a dummy for...

    Started by diesel20056‎, 12-18-2011 03:09 PM
    • Replies: 2
    • Views: 1,867
    12-18-2011, 04:39 PM Go to last post
  11. Not sure what kind of regression to run here, plus extra ?'s

    Hey there. Frustrated grad student who's never been good at math here. :P Suffering through a final project, could use some input. We're using...

    Started by chirs3‎, 12-17-2011 08:43 AM
    • Replies: 0
    • Views: 1,383
    12-17-2011, 08:43 AM Go to last post
  12. (easy?) Partial slope coefficients question...

    Slopes from auxiliary regressions where each variable is regressed on one of the others. Variables have all been mean-deviated so the constant terms...

    Started by jesse2‎, 12-15-2011 02:25 PM
    • Replies: 0
    • Views: 2,737
    12-15-2011, 02:25 PM Go to last post
  13. Firm Fixed Effects

    In some regressions the the authors control for “firm fixed effects”. What does that mean? What are Firm fixed effects specifically? Are they just...

    Started by JelleJansen‎, 12-14-2011 09:26 AM
    • Replies: 4
    • Views: 11,642
    12-15-2011, 08:22 AM Go to last post
  14. Regression when outcome is a rank?

    Is there a particular kind of regression if the outcome is a ranking? I'm wondering if my best bet would be to use the central limit theorem and use...

    Started by zeloc‎, 12-07-2011 08:06 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 19,901
    12-14-2011, 02:36 PM Go to last post
  15. Multivariate regression analysis

    Hi guys, I have a conceptual question. I was taught that when building a multivariate regression analysis, let's say y=b0+b1X1+b2X2, I interpret...

    Started by NN_STAT‎, 12-14-2011 02:35 AM
    • Replies: 2
    • Views: 2,052
    12-14-2011, 08:42 AM Go to last post
  16. two ANOVAs, which to use?

    Hypothetical: you have ANOVA tables from two regressions. One is regressed on more variables than the other. The one with more variables, has a low...

    Started by el_presidente_psych‎, 12-12-2011 10:16 AM
    • Replies: 6
    • Views: 2,505
    12-13-2011, 10:12 AM Go to last post
  17. Help-The F or chi2 model statistic has been reported as missing

    Hello All, I use Robust regression for event study- cross sectional. I have 25 industries dummies (0,1) in my regression and always "Adj...

    Started by Stata_user‎, 12-13-2011 08:30 AM
    • Replies: 0
    • Views: 5,026
    12-13-2011, 08:30 AM Go to last post
  18. Assumptions of Quantile Regression

    Is equal variance an assumption of quantile regression? Does quantile or median regression have any assumptions? Thanks.

    Started by zeloc‎, 12-11-2011 02:23 PM
    • Replies: 1
    • Views: 3,220
    12-12-2011, 02:07 AM Go to last post
  19. partial r2 vs partial correlation vs stnd coefficients

    Hi all, I have run a few linear regression models predicting water quality for watersheds using explanatory variables such as mean impervious...

    Started by seth‎, 02-11-2011 01:30 AM
    • Replies: 9
    • Views: 20,115
    12-11-2011, 09:02 PM Go to last post
  20. How to antilog a regression

    Hi, My excel regression produced the following: Coefficient Constant 6.5804 Log(Unit_Produced) -0.4752 The...

    Started by pcampin‎, 12-10-2011 11:21 AM
    • Replies: 4
    • Views: 9,788
    12-11-2011, 05:12 PM Go to last post
  21. Linear Regression: Mean square error (MSE) ?

    Simple linear regression model: Y_i = β0 + β1*X_i + ε_i , i=1,...,n where n is the number of data points, ε_i is random error Let σ^2 = V(ε_i)...

    Started by kingwinner‎, 05-21-2009 07:46 PM
    • Replies: 11
    • Views: 55,354
    12-11-2011, 12:32 PM Go to last post
  22. Can RSS be decreased to 0 when dimension increases?

    Let's consider a simple example: I have two attributes X1 and X2, each has n values; response variable is Y. Using the two attributes together to...

    Started by ColdKing‎, 12-10-2011 12:59 PM
    dimension, regression, rss
    • Replies: 7
    • Views: 3,300
    12-11-2011, 01:07 AM Go to last post
  23. Multiple regression - text dropped an independent variable without explanation

    Hi, My text provided many independent variables including 4 departments. But in the actual regression, they excluded one department without...

    Started by pcampin‎, 12-10-2011 11:34 AM
    • Replies: 2
    • Views: 1,355
    12-10-2011, 05:14 PM Go to last post
  24. How to pick the better model parameter in this example?

    Let's say the model is fixed (e.g., a linear model where 5 coefficients need to be fit). Denote the parameter (coefficient) vector as \beta. ...

    Started by ColdKing‎, 12-10-2011 12:10 PM
    data, model selection, regression
    • Replies: 4
    • Views: 1,816
    12-10-2011, 03:07 PM Go to last post
  25. Endogenous variable

    Hi, I am implementing a two-stage OLS regression to account for the endogeneity of a variable. My instruments are time invariant. However, the...

    Started by tiab2005‎, 12-07-2011 05:40 PM
    endogeneity, instrumental variables, two-stage ols
    • Replies: 1
    • Views: 1,433
    12-10-2011, 12:30 PM Go to last post
  26. Testing a predictive algorithm

    I have an algorithm that takes text data and predicts polarity of the data between -1 and 1. I want to test this algorithm for it's ability to...

    Started by trinker‎, 12-07-2011 09:26 PM
    • Replies: 7
    • Views: 2,889
    12-08-2011, 07:38 PM Go to last post
  27. question about Logistic regression

    Hi, I've wondered about logistic analysis. In glm(generalized linear model), link function value of mean = linear predictot. So, classical model's...

    Started by subspaces‎, 12-08-2011 02:26 AM
    • Replies: 2
    • Views: 2,034
    12-08-2011, 07:50 AM Go to last post
  28. Pearson's correlation coefficient (Excel help)

    Hello, new user here :) I have created distance matrices for two data sets (a ligand and it's receptor) and I now must compute the linear...

    Started by Ashmore‎, 12-03-2011 07:28 AM
    • Replies: 1
    • Views: 2,060
    12-07-2011, 08:10 PM Go to last post
  29. Ordinal Logistic vs. Multinomial Regression and program

    I am trying to conceptually understand when I would use ordinal logistic vs. multinomial. It seems to me that if there is an order to the categories...

    Started by zeloc‎, 12-07-2011 01:56 PM
    • Replies: 2
    • Views: 2,795
    12-07-2011, 08:04 PM Go to last post
  30. GEE and sample size

    Hello, I'd like to know how to correct for small sample size in GEE.

    Started by Itddoo‎, 12-07-2011 02:48 PM
    • Replies: 1
    • Views: 2,918
    12-07-2011, 03:44 PM Go to last post
  31. negative binomial regression

    hello all, i'm looking for some articles regarding negative binomial regression. i don't know much about general linear models or logistic...

    Started by RefUser‎, 12-06-2011 01:17 PM
    • Replies: 2
    • Views: 2,369
    12-06-2011, 02:03 PM Go to last post
  32. Which method to compare models with truth?

    Hi all, Edit: First I must say sorry for the ridiculous spelling mistake in the title! I wish I could go back and change 'two' to 'to'. I have...

    Started by seanelvidge‎, 12-06-2011 10:37 AM
    analysis, comparison, models
    • Replies: 4
    • Views: 2,056
    12-06-2011, 11:49 AM Go to last post
  33. compare Spearman's correlations

    Dear all, I performed several Spearman's correlation tests between the same independent variable and different dependent ones. All the...

    Started by marco77‎, 12-05-2011 10:29 AM
    • Replies: 2
    • Views: 3,283
    12-06-2011, 05:07 AM Go to last post
  34. Advice for random effects with interaction term?

    I have a continuous dependent variable A and a continuous independent variable B. I measured these variables in 12 locations that can be separated...

    Started by sovay‎, 12-05-2011 12:26 AM
    • Replies: 1
    • Views: 3,743
    12-05-2011, 03:26 PM Go to last post
  35. Can I trust a regression if variables are autocorrelated?

    Hello everyone! Both variables (dependent and independent) show autocorrelation effects. When I run regression and estimate the residuals, they...

    Started by Mistermishka‎, 12-03-2011 01:48 PM
    autocorrelation, regression analysis, t-statistic
    • Replies: 6
    • Views: 2,737
    12-04-2011, 10:59 AM Go to last post
  36. Question about a question

    Thanks for the help!

    Started by lancearmstrong1313‎, 12-02-2011 11:06 PM
    • Replies: 3
    • Views: 2,804
    12-03-2011, 09:59 AM Go to last post
  37. Model evaluation in logistic regression

    I am doing the analysis in very recent forms of SAS (if any use that here). I ran a logistic model with a huge number of data points (some 11,000)....

    Started by noetsi‎, 11-01-2011 06:41 PM
    • Replies: 6
    • Views: 6,265
    12-02-2011, 04:14 PM Go to last post
  38. linear regression where the indepedant variables are parameters

    I have a single independent variable, X, in the following regression model: Y = \beta_0 + \beta_1 * X + e where X = mean(X_xy) X_xy is a...

    Started by owl99‎, 12-02-2011 10:29 AM
    • Replies: 0
    • Views: 1,807
    12-02-2011, 10:29 AM Go to last post
  39. Proportion of positive reponses in a logistic regression

    Hello, When we do a logistic regression to predict a dichotomous variable (yes/no), should there be some minimum proportion of yes to no responses...

    Started by Ravi Kulkarni‎, 12-02-2011 05:23 AM
    logistic regression
    • Replies: 3
    • Views: 2,623
    12-02-2011, 06:30 AM Go to last post
  40. General Linear Model issues.

    Again, I hope this is in the correct sub-forum. Having had some very useful advice for my first issue, I thought I might post my second problem, this...

    Started by _Alex_‎, 11-30-2011 05:29 PM
    • Replies: 2
    • Views: 5,789
    12-01-2011, 07:32 PM Go to last post
  41. Beta positive - Slope of best fit line negative

    hello, scratching my head over some regression output i'm getting from Excel. as you can see from below, the best fit line on my indeptendent...

    Started by flatliner‎, 11-29-2011 07:03 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 9,971
    12-01-2011, 03:20 PM Go to last post
  42. The Mediation Analysis by Regression

    Hi All, Does Anyone Know a good reference to conduct the Mediation Analysis by Regression by SPSS? Many thanks, Gh

    Started by ghada8888‎, 11-30-2011 01:48 PM
    • Replies: 4
    • Views: 3,069
    12-01-2011, 12:13 PM Go to last post
  43. Observing relationships through regression.

    Hi all - I hope this is in the right sub-forum... I have a question regarding regression and working out the relationship between two variables....

    Started by _Alex_‎, 11-29-2011 12:24 PM
    • Replies: 8
    • Views: 2,789
    11-30-2011, 04:37 PM Go to last post
  44. Interpreting Interaction Terms

    I am working on a regression analysis problem where we have to see if there is an interaction between two of the independent (X) variables. I run...

    Started by _IT_Not_Stats_‎, 11-29-2011 04:00 PM
    • Replies: 3
    • Views: 1,946
    11-30-2011, 12:26 PM Go to last post
  45. Displaying multiple regression

    Dear stats experts - I wondering if it's possible to display a multiple regression with three predictors that are all significant on a graph. ...

    Started by antonzzz‎, 11-30-2011 06:50 AM
    • Replies: 0
    • Views: 1,605
    11-30-2011, 06:50 AM Go to last post
  46. log-transformation and interaction effects

    If I log-transform either one of my predictor variables or my outcome variable, can that change the significance of any of my interaction terms? ...

    Started by bitethemuffin‎, 11-29-2011 07:51 PM
    • Replies: 0
    • Views: 3,844
    11-29-2011, 07:51 PM Go to last post
  47. Assumptions of logistic regression

    Anyone know a good authoritative source for the assumptions of logistic regression? They differ obviously from OLS and I have not found a good source...

    Started by noetsi‎, 11-22-2011 01:43 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 47
    • Views: 81,015
    11-29-2011, 07:40 PM Go to last post
  48. Panel Data Analysis, Help Urgently Needed! Fixed & Random effects, Fama MacBeth etc.

    Hi, I have the following panel dataset: 11 years of annual data with a total of 250 observations. The panel is highly unbalanced, in the beginning...

    Started by Sascha93‎, 11-29-2011 04:34 PM
    fama macbeth regression, fixed effects, panel data, random coefficient, random effects
    • Replies: 0
    • Views: 6,090
    11-29-2011, 04:34 PM Go to last post
  49. Rm anova ?

    Hi guys, I need a confirmation... I have a research containing 4 groups, 3 treatments and a control group. For every subject, there are...

    Started by Yankel‎, 11-29-2011 01:51 PM
    • Replies: 0
    • Views: 1,585
    11-29-2011, 01:51 PM Go to last post
  50. Durbin-Watson table

    Hi.. Anyone here know how to determine whether we violated the assumption for durbin watson test... i found the table but the max sample size is...

    Started by psychology_student‎, 11-28-2011 09:17 AM
    • Replies: 3
    • Views: 4,910
    11-29-2011, 11:11 AM Go to last post
  51. Logit versus Probit versus Linear Probability Coefficients

    Hi all, Fairly simple question... What exactly are the meanings of the coefficients in logit, probit, and linear probability models? I'm staring...

    Started by PoliticalEconomist‎, 11-27-2011 06:08 PM
    • Replies: 2
    • Views: 3,907
    11-28-2011, 04:49 PM Go to last post
  52. Smile Calculating Covariance Matrix (Regression Analysis)

    Im having difficulty in trying to compute the Covariance Matrix. I think Im missing out an equation to be honest. Here's what I've been given in the...

    Started by garunas‎, 11-27-2011 01:19 PM
    covariance matrix, least squares, regression analysis, variance
    • Replies: 4
    • Views: 6,839
    11-28-2011, 04:36 PM Go to last post
  53. standardized beta that suddenly rise very high

    Hi guys... i need help here... i don't understand why one of my variable (old_adult) standardized beta can increase from .144 which is not...

    Started by psychology_student‎, 11-27-2011 11:29 PM
    • Replies: 0
    • Views: 1,863
    11-27-2011, 11:29 PM Go to last post
  54. Possible to do a post hoc correction?

    I am trying to understand a multiple regression problem I have. The problem is that one of my independent variables has a bivariate correlation to...

    Started by MissEvil‎, 11-27-2011 08:23 AM
    • Replies: 1
    • Views: 2,129
    11-27-2011, 12:04 PM Go to last post
  55. Linear regression on seemingly linear data, but residual plot is a parabola?

    So I did a linear regression on x y data that seemed very linear, but the residual plot was a a clear parabola. Next I did a 2nd order polynomial...

    Started by saveourpens‎, 11-26-2011 02:32 PM
    • Replies: 2
    • Views: 6,063
    11-27-2011, 05:56 AM Go to last post
  56. linear regression -- the regressor X is random

    Hi, I am studying linear regression from the book titled, "Introduction to Linear Regression" by Montgomery. I am reviewing some previous...

    Started by foobar123‎, 11-26-2011 02:30 AM
    • Replies: 0
    • Views: 3,913
    11-26-2011, 02:30 AM Go to last post
  57. Regression analysis

    Hi I'm currently doing a case study for school and I'm just wondering if I'm on the right track. I'm doing regression analysis on what determines the...

    Started by Kokujin‎, 11-23-2011 11:57 PM
    • Replies: 4
    • Views: 1,955
    11-25-2011, 11:16 PM Go to last post
  58. confidence band from se in quadratic regression

    Hi, I have the following problem: I want to draw confidence band for a quadratic regression I have the model: y=a+b*x+c*x^2, i have...

    Started by pnouvellet‎, 11-25-2011 07:29 AM
    confidence interval, regression, standard error
    • Replies: 0
    • Views: 1,462
    11-25-2011, 07:29 AM Go to last post
  59. Basic multiple regression question

    Sorry, should've probably specified linear regression. I was given a data and ran a proc corr on it in sas. As you can see, x1 through x5...

    Started by downthesun01‎, 11-16-2011 01:00 AM
    • Replies: 7
    • Views: 2,292
    11-25-2011, 05:22 AM Go to last post
  60. Multilevel modeling with poission regression

    Hi, I am using the software package HLM to perform a poisson regression on categorical data that is clustered. The responses are ranked in order...

    Started by ifacto‎, 11-24-2011 03:42 AM
    • Replies: 0
    • Views: 1,748
    11-24-2011, 03:42 AM Go to last post

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