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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. GEE prediction interval... Help?

    Ok, so I'm a bit stuck here... I used a GEE model, with 2 groups (group as factor) within each group subjects walk at two different walking speeds....

    Started by bbikkel‎, 01-30-2011 03:33 PM
    • Replies: 0
    • Views: 2,438
    01-30-2011, 03:33 PM Go to last post
  2. Question Power, Sample Size, Interactions ?

    Hello Everyone BACKGROUND I am working on a psychology project. Initially, I was going to do two separate regressions for each ethnic group but...

    Started by Student T‎, 01-29-2011 12:40 PM
    • Replies: 2
    • Views: 4,581
    01-31-2011, 04:32 AM Go to last post
  3. Help finding standard error

    If i have following regression and numbers: Y(with a "hat" over)= -66,1058 + 0,0650X R^2= 0,9460 Se(standard error) = (10,7509) ( ...

    Started by student89‎, 02-02-2011 05:59 AM
    • Replies: 0
    • Views: 1,684
    02-02-2011, 05:59 AM Go to last post
  4. Question Formulas for : CVRMSE and Net Mean Bias

    Hi folks, I am in the energy industry, and we do linear/multilinear regressions stats. One of the concepts being introduced to supplement...

    Started by paluee‎, 02-03-2011 12:53 PM
    • Replies: 0
    • Views: 3,583
    02-03-2011, 12:53 PM Go to last post
  5. linear regression for non normal data

    Hi, Some of my variables are not normally distributed (with Kolmogorov-Smirnov and Shapiro-Wilk tests). So I used Spearman's correlations. But I...

    Started by neurophilo‎, 02-04-2011 11:15 AM
    • Replies: 2
    • Views: 9,696
    02-04-2011, 11:34 AM Go to last post
  6. Multiple Regression - Adjusted Rsquare & SEE vs. coefficient sig.

    I'm doing an assignment where we are just learning about regression. We were given a set of data and ran it through SPSS. Now, I am trying to...

    Started by SeraphicMirth‎, 02-04-2011 11:53 AM
    • Replies: 1
    • Views: 5,246
    02-04-2011, 01:51 PM Go to last post
  7. goal is logistical regression model...where to start

    I'm working with weather data using systat software. I have raw values of dependent variable visibility that have been categorized into boolean 1/0...

    Started by civilsurfer‎, 02-07-2011 12:08 PM
    • Replies: 0
    • Views: 2,012
    02-07-2011, 12:08 PM Go to last post
  8. independant variables?

    I'm a little confused on the whole dependent-independent thing.... I'm doing a multiple linear regression with 13 variables in order to predict...

    Started by danjohnson10‎, 02-08-2011 03:50 PM
    • Replies: 0
    • Views: 2,049
    02-08-2011, 03:50 PM Go to last post
  9. questions on logistics modeling

    While studying logistic modeling, I read the following statement I do not know what do the "case-control" and "cross-sectional studies"...

    Started by winecoding‎, 02-08-2011 04:33 PM
    • Replies: 1
    • Views: 3,136
    02-08-2011, 06:00 PM Go to last post
  10. Marketing Impact Regression

    Hello all! I am rather new to STATA / statistics, so I wanted to see if I can get some help from the experts that browse talkstats.com. As the...

    Started by heechiro‎, 02-08-2011 05:45 PM
    • Replies: 2
    • Views: 2,906
    02-08-2011, 06:09 PM Go to last post
  11. Using cross-sectional data in pooled time-series analysis

    I'm doing a pooled time-series regression analysis of GHG emissions, relative to aims in the Kyoto-protocol (annual observations 1990-2008, country...

    Started by OleMartin‎, 02-09-2011 04:22 PM
    • Replies: 2
    • Views: 4,755
    02-09-2011, 04:51 PM Go to last post
  12. [newbie dumb question] Why is that the assumption of E(u)=0 essential for interences?

    If E(u)=0 is violated, how would it affect the inference of parameters, such as by using t-statistics? My understanding is that if E(u)=0 is...

    Started by elton.li‎, 02-09-2011 06:02 PM
    • Replies: 3
    • Views: 5,313
    02-10-2011, 12:27 AM Go to last post
  13. Confounding and rank of expanded design matrix

    Hello, If I have confounding with 1 defining equation two columns of the expanded design matrix are equal (blocks and the confounding factor). ...

    Started by mmstat‎, 02-11-2011 11:32 AM
    • Replies: 0
    • Views: 2,815
    02-11-2011, 11:32 AM Go to last post
  14. Moved: single observation multi-year variables

    Started by tomatowill03‎, 02-13-2011 10:10 AM
    • Replies: -
    • Views: -
    02-13-2011, 10:10 AM Go to last post
  15. Need help on a GMM estimation

    Hello to all, I am trying to do a GMM estimation (with xtabond2) on a little sample of about 250 observation, but I cannot get a good result (in...

    Started by roman10‎, 02-13-2011 02:59 PM
    • Replies: 0
    • Views: 2,472
    02-13-2011, 02:59 PM Go to last post
  16. Red face regression - given model, assess probability of results

    Hi, (It's many, many years since my last foray into statistics so please be gentle..) In its simplest form my question is this: I have...

    Started by TimBom‎, 02-15-2011 09:53 AM
    probability, regression
    • Replies: 1
    • Views: 3,010
    02-15-2011, 05:12 PM Go to last post
  17. implications of residual heteroskedasticity

    Hello, I'm running a multiple regression with 4 predictors, and when I examined the Standardized residuals. a Graph is below. I'm just...

    Started by Lambic_Treasure‎, 02-14-2011 02:34 PM
    • Replies: 9
    • Views: 5,843
    02-15-2011, 05:40 PM Go to last post
  18. Interaction can change slope coefficients

    Hi all, Would anyone be able to explain why an interactive regression model would have different main effects than an additive model of the same...

    Started by not_normal‎, 02-15-2011 10:46 PM
    • Replies: 0
    • Views: 2,129
    02-15-2011, 10:46 PM Go to last post
  19. Error distribution and non linear models.

    Ok, I am reformulating this question because it started rather silly. As I always point out, my background is not statistics so please excuse my...

    Started by darfunkel‎, 02-16-2011 11:31 AM
    • Replies: 0
    • Views: 1,981
    02-16-2011, 11:31 AM Go to last post
  20. Coefficient of determination and statistical significance

    Hi, I tried two different models for a regression (both with one predictor). The first one was a linear regression model of the type Y= a + bX...

    Started by val92‎, 02-15-2011 05:24 PM
    • Replies: 6
    • Views: 15,314
    02-16-2011, 01:49 PM Go to last post
  21. What test can I use to find out which bivariate regression is *significantly* better?

    I have three variables: y, x1 and x2 (n=130). I want to know whether one of the x variables is a significantly better bivariate predictor than the...

    Started by verarium‎, 02-15-2011 05:32 PM
    • Replies: 3
    • Views: 2,974
    02-16-2011, 01:49 PM Go to last post
  22. Dealing with multi-level categorical variables in regression

    Hi everyone, I have been working in R and using lmer() to run mixed-effect linear and logistic regression models to study language processing. ...

    Started by mgillespie‎, 02-16-2011 02:37 PM
    collinearity, dummy variables, regression
    • Replies: 0
    • Views: 5,904
    02-16-2011, 02:37 PM Go to last post
  23. dummy variable multiple regression

    Hello guys, I am doing a project on calendar affects(seasonality) in the stock market for which i am trying to perform a dummy variable regression...

    Started by Manasa‎, 02-17-2011 08:45 AM
    • Replies: 2
    • Views: 8,791
    02-17-2011, 12:04 PM Go to last post
  24. Fixed Effects Common Panel Regression versus GMM estimation

    Hi, I have estimated my model using the Fixed Effects Common Panel method and this seems to work fine. I get an R2 of .90 However, I am now in...

    Started by Herbert‎, 02-18-2011 07:43 AM
    common panel, fixed effects, gmm
    • Replies: 0
    • Views: 6,116
    02-18-2011, 07:43 AM Go to last post
  25. [Probit] Can I be confident in my results even with a poor Goodness-of-Fit test?

    I am running a probit analysis on a data set with about 1000 cases, predicting probability of college graduation by a set of college institutional...

    Started by DavidBill‎, 02-18-2011 01:08 PM
    • Replies: 3
    • Views: 4,294
    02-18-2011, 03:27 PM Go to last post
  26. Appropriate logistic regression model to control for confounders?

    I am working with a cross-sectional study sample (N=601). The goal of my research is to investigate if there is an association between a disease (X)...

    Started by CarlAH‎, 02-18-2011 04:26 PM
    • Replies: 2
    • Views: 9,833
    02-18-2011, 05:20 PM Go to last post
  27. Help needed with counter intuitive result in OLS

    Hi All, I have a simple linear regression run between say, statements about the impression with a brand on its favorability What i am getting...

    Started by satish.kumar1986‎, 02-20-2011 02:03 PM
    • Replies: 5
    • Views: 3,933
    02-21-2011, 04:48 AM Go to last post
  28. Trouble standardizing regression slopes

    Dear readers, Hopefully you can help me with the following problem. I am using meta-analytic software to perform a meta-analysis. When I...

    Started by mks650‎, 02-22-2011 12:46 PM
    beta, regression, standardization
    • Replies: 0
    • Views: 3,857
    02-22-2011, 12:46 PM Go to last post
  29. Poisson Regression Offset -- Constrain to 1?

    I have a regression where the observation time varies. I would like to use an offset. Right now, my time variables are . What does it mean to...

    Started by tiab2005‎, 02-22-2011 04:44 PM
    • Replies: 0
    • Views: 2,668
    02-22-2011, 04:44 PM Go to last post
  30. confidence interval/f-tests

    Basically Fe (iron) is the x variable/predictor, and MDD loss is the y variable/response in minitab. 1. I generated some data (regressoin...

    Started by gomes.‎, 02-21-2011 06:42 PM
    • Replies: 1
    • Views: 6,330
    02-23-2011, 01:01 PM Go to last post
  31. Linear regression on bio-data.

    Hi all, I'm completely new to this forum so forgive me (and tell me) if I break protocol in any way. My setup is: I have n animals. I believe...

    Started by Kettle‎, 02-20-2011 06:12 AM
    • Replies: 6
    • Views: 5,046
    02-23-2011, 07:37 PM Go to last post
  32. Stepwise Regression Analysis

    Under what condition (or conditions) would one observe no change in the regression coefficient for some variable (e.g., b-hat Y on X1) when another...

    Started by sask‎, 02-22-2011 12:40 PM
    • Replies: 1
    • Views: 4,801
    02-23-2011, 10:12 PM Go to last post
  33. An R question about GLM

    I want to predict a set of proportions from a linear regression using glm in R. The model has a logit link but I want extract the variance-covariance...

    Started by crispin‎, 02-24-2011 04:36 AM
    r logit
    • Replies: 0
    • Views: 2,185
    02-24-2011, 04:36 AM Go to last post
  34. Develop analysis plan on Medical data - trend analysis and model

    First, let me say thank you for any help you can give. I have been searching for nearly two days for a solution to my problem and continue to be...

    Started by JHale‎, 02-24-2011 08:43 AM
    • Replies: 1
    • Views: 7,902
    02-24-2011, 11:20 AM Go to last post
  35. Probit: Assumption e~N(0,1), why?

    Good evening, I have got a question according the Probit-Model. In this model we always assume that the error term is standard normally...

    Started by RBla‎, 02-24-2011 03:18 PM
    binary response models, discrete response models, index models, probit
    • Replies: 0
    • Views: 2,742
    02-24-2011, 03:18 PM Go to last post
  36. problem with MR

    Hi, I have a problem with the results of MR and I hope somebody can help me:) conducting MR with Enter method, I got a model which is not...

    Started by jana0303‎, 02-24-2011 03:29 AM
    • Replies: 8
    • Views: 2,570
    02-24-2011, 04:01 PM Go to last post
  37. GLM Parameter Estimation in R

    Hello everyone! I was searching for GLM content, then I found this forum, so I thought you could help me :). I'm starting to study GLMs and I know...

    Started by Kol‎, 02-24-2011 08:02 PM
    • Replies: 0
    • Views: 4,555
    02-24-2011, 08:02 PM Go to last post
  38. Heteroscedasticity

    I am new to this. I'm conducting analysis using standard multivariate regression and I've been look at some of the outputs from my model (I'm...

    Started by Novice2011‎, 02-24-2011 09:18 PM
    • Replies: 0
    • Views: 3,075
    02-24-2011, 09:18 PM Go to last post
  39. Probit Model: Liklihood Ratio Significant, Very Low Pseudo R-Square

    I'm running a probit model in Stata, and I'm a bit confused by the results. The LR test is highly significant, .0000, but the Pseudo R-Square is very...

    Started by DavidBill‎, 02-25-2011 02:34 AM
    • Replies: 0
    • Views: 5,010
    02-25-2011, 02:34 AM Go to last post
  40. Addendum: Probit Model, Liklihood Ratio Significant, Very Low Pseudo R-Square

    Multicollinearity does not appear to be a problem. None of the predictor variables has a VIF over 1.5.

    Started by DavidBill‎, 02-25-2011 08:47 AM
    • Replies: 2
    • Views: 3,819
    02-25-2011, 11:23 AM Go to last post
  41. Question Automated multivariate nonlinear regression

    I have 4,300 lines of data that looks like this in each column: IV1, IV2, IV3, DV1, DV2 It has five columns, three are IVs, two are DVs. How can I...

    Started by Chicken325‎, 02-26-2011 03:06 PM
    multiple regression
    • Replies: 1
    • Views: 2,899
    02-26-2011, 04:36 PM Go to last post
  42. Two dependent variables, same independent variables

    Hi, If I have two very similar regressions where the only difference is the dependent variables, can you compare the influence of the independent...

    Started by tiab2005‎, 02-25-2011 09:12 AM
    • Replies: 1
    • Views: 7,491
    02-27-2011, 03:27 PM Go to last post
  43. Post Discriminant Analysis Issue

    Hello, I'm trying to make sense out of a recent discriminate analysis I ran which confused me. I got really a really low eigenvalue which...

    Started by cinta19‎, 02-27-2011 07:26 PM
    • Replies: 0
    • Views: 3,284
    02-27-2011, 07:26 PM Go to last post
  44. simple logistic regression question

    I'm doing a willingness to pay survey to see if people are willing to spend $1 for clean water. I randomly sampled 100 people and one of the...

    Started by alphaqn69‎, 02-12-2011 05:10 PM
    • Replies: 5
    • Views: 5,032
    02-28-2011, 12:36 AM Go to last post
  45. R-squared and Explained Sum of Squares?

    I'm not quite sure how to get started on this one, any suggestions? Thanks!! "If you have the following: R-squared for Y on X1,2,3 is 0.25,...

    Started by sask‎, 02-28-2011 11:26 AM
    • Replies: 2
    • Views: 5,085
    02-28-2011, 12:09 PM Go to last post
  46. Interpreting Logit Regression Output

    Hi, I'm running logit regression with systat, using fog as a dependent variable (fog did not occur or did, 0 or 1) against 115 predictors with all...

    Started by civilsurfer‎, 02-28-2011 02:08 PM
    • Replies: 0
    • Views: 3,322
    02-28-2011, 02:08 PM Go to last post
  47. Residualized Coefficient Using Solely Variances and Covariances

    I just want to confirm that I'm on the right track. I need to derive an expression for b^Y1.2 that refers solely to variances and covariances...

    Started by sask‎, 03-01-2011 04:14 PM
    • Replies: 0
    • Views: 2,201
    03-01-2011, 04:14 PM Go to last post
  48. Slope comparison in two-phase regression analysis

    Hi I am using a two-phase regression analysis to analyze some physiological data. The analysis is based on using two, simple linear regressions...

    Started by mattcass‎, 03-01-2011 05:27 PM
    • Replies: 0
    • Views: 5,178
    03-01-2011, 05:27 PM Go to last post
  49. which regression model for time series?

    Hi guys, please help. I need to do regression analysis for demographic data. I am not sure whether linear or logistic regression would be...

    Started by Sylviastat‎, 02-28-2011 02:40 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 10,700
    03-02-2011, 10:59 AM Go to last post
  50. Algebraic Definition of Residuals from a Regression

    I just need a hint on how to get started on this. Any advice? Define the residual from a regression (one independent variable) algebraically and...

    Started by cassetete‎, 03-01-2011 09:07 AM
    regression analysis
    • Replies: 1
    • Views: 3,200
    03-02-2011, 01:31 PM Go to last post
  51. Simple command in SAS for regression with a large number of covariates?

    I'm a new poster and I searched before creating this thread, so I hope I'm not raising a common question that is constantly being answered here. ...

    Started by Janus‎, 03-01-2011 10:54 PM
    • Replies: 4
    • Views: 4,291
    03-02-2011, 04:25 PM Go to last post
  52. Linear Regression Through a Point

    Hi Everyone, I'm trying to find the slope of the regression line with the least squares fit which passes through a certain point (x_0,y_0) The...

    Started by timmo567‎, 03-03-2011 03:48 AM
    • Replies: 0
    • Views: 3,606
    03-03-2011, 03:48 AM Go to last post
  53. regression analysis for massive data sets

    Assume the size of data set is massive, is there any consideration when performing regression analysis?

    Started by winecoding‎, 03-03-2011 11:11 AM
    • Replies: 1
    • Views: 2,580
    03-03-2011, 11:23 AM Go to last post
  54. Binary predictors, continuous independent V!

    hi everyone I need help with doing a regression model. How can I perform a regression analysis when the only independent variable is a continuous...

    Started by helloamerica‎, 03-03-2011 12:37 PM
    • Replies: 3
    • Views: 3,823
    03-03-2011, 05:52 PM Go to last post
  55. Regression Possibility?

    I've got some real data (from a real experiment), and I'm having trouble finding a way to carry out a regression. The independent variable is...

    Started by AdvoTDV‎, 03-04-2011 12:45 AM
    • Replies: 2
    • Views: 2,205
    03-04-2011, 04:03 AM Go to last post
  56. regression analysis with non normal residuals

    I am a relative novice at stats so I would appreciate any help on this. Please let me know if I need to provide any more info to answer the question....

    Started by crispin‎, 03-04-2011 09:55 AM
    • Replies: 0
    • Views: 3,511
    03-04-2011, 09:55 AM Go to last post
  57. Regression Assumptions for Binary Dependent Variable Models?

    I was wondering if anyone could direct me to a good source on this, or just answer my question directly. What are the assumptions made for a...

    Started by DavidBill‎, 03-04-2011 12:00 AM
    • Replies: 3
    • Views: 18,881
    03-04-2011, 12:20 PM Go to last post
  58. Question What GLM should is use in this dataset?

    Hi everyone and thank you! I'm not a student of statistics, i'm in a different but somehow related field. i'm doing this research, been reading...

    Started by juantamad‎, 03-05-2011 03:46 AM
    categorical data analysis, correspondence analysis, regression, test of indepdence
    • Replies: 1
    • Views: 3,426
    03-05-2011, 04:22 AM Go to last post
  59. Question Correlation coeffcient

    I have no idea where to begin with this. If someone could guide me into the right direction, please. If the correlation coefficient is 0.97, what...

    Started by jamjammuffin‎, 03-05-2011 08:44 AM
    • Replies: 1
    • Views: 3,060
    03-05-2011, 09:23 AM Go to last post
  60. How to handle discrete predictors in a HLM?

    Hi there, I have longitudinal data with several time-invariant predictors (age, gender, personality) and one dichotomous time-variant predictor...

    Started by olliog‎, 03-05-2011 06:18 PM
    • Replies: 0
    • Views: 2,779
    03-05-2011, 06:18 PM Go to last post

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