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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....

• Replies: 0
• Views: 2,438
01-30-2011, 03:33 PM
2. ### 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...

• Replies: 2
• Views: 4,581
01-31-2011, 04:32 AM
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) ( ...

• Replies: 0
• Views: 1,684
02-02-2011, 05:59 AM
4. ### 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...

• Replies: 0
• Views: 3,583
02-03-2011, 12:53 PM
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...

• Replies: 2
• Views: 9,696
02-04-2011, 11:34 AM
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...

• Replies: 1
• Views: 5,246
02-04-2011, 01:51 PM
7. ### 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...

• Replies: 0
• Views: 2,049
02-08-2011, 03:50 PM
8. ### 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"...

• Replies: 1
• Views: 3,136
02-08-2011, 06:00 PM
9. ### 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...

• Replies: 2
• Views: 2,906
02-08-2011, 06:09 PM
10. ### 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...

• Replies: 2
• Views: 4,755
02-09-2011, 04:51 PM
11. ### [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...

• Replies: 3
• Views: 5,313
02-10-2011, 12:27 AM
12. ### Moved: single observation multi-year variables

• Replies: -
• Views: -
02-13-2011, 10:10 AM
13. ### 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...

• Replies: 0
• Views: 2,472
02-13-2011, 02:59 PM
14. ### 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...

• Replies: 1
• Views: 3,010
02-15-2011, 05:12 PM
15. ### 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...

• Replies: 0
• Views: 2,129
02-15-2011, 10:46 PM
16. ### 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...

• Replies: 0
• Views: 1,981
02-16-2011, 11:31 AM
17. ### 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...

• Replies: 6
• Views: 15,314
02-16-2011, 01:49 PM
18. ### 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...

• Replies: 3
• Views: 2,974
02-16-2011, 01:49 PM
19. ### 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. ...

• Replies: 0
• Views: 5,904
02-16-2011, 02:37 PM
20. ### 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...

• Replies: 2
• Views: 8,791
02-17-2011, 12:04 PM
21. ### 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...

• Replies: 0
• Views: 6,116
02-18-2011, 07:43 AM
22. ### [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...

• Replies: 3
• Views: 4,294
02-18-2011, 03:27 PM
23. ### 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)...

• Replies: 2
• Views: 9,833
02-18-2011, 05:20 PM
24. ### 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...

• Replies: 5
• Views: 3,933
02-21-2011, 04:48 AM
25. ### 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...

• Replies: 0
• Views: 3,857
02-22-2011, 12:46 PM
26. ### 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...

• Replies: 0
• Views: 2,668
02-22-2011, 04:44 PM
27. ### 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...

• Replies: 1
• Views: 6,330
02-23-2011, 01:01 PM
28. ### 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...

• Replies: 6
• Views: 5,046
02-23-2011, 07:37 PM
29. ### 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...

• Replies: 1
• Views: 4,801
02-23-2011, 10:12 PM
30. ### 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...

• Replies: 0
• Views: 2,185
02-24-2011, 04:36 AM
31. ### 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...

• Replies: 1
• Views: 7,902
02-24-2011, 11:20 AM
32. ### 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...

• Replies: 0
• Views: 2,742
02-24-2011, 03:18 PM
33. ### 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...

• Replies: 8
• Views: 2,570
02-24-2011, 04:01 PM
34. ### 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...

• Replies: 0
• Views: 4,555
Kol
02-24-2011, 08:02 PM
35. ### 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...

• Replies: 0
• Views: 3,075
02-24-2011, 09:18 PM
36. ### 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...

• Replies: 0
• Views: 5,010
02-25-2011, 02:34 AM
37. ### 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.

• Replies: 2
• Views: 3,819
02-25-2011, 11:23 AM
38. ### 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...

• Replies: 1
• Views: 2,899
02-26-2011, 04:36 PM
39. ### 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...

• Replies: 1
• Views: 7,491
02-27-2011, 03:27 PM
40. ### 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...

• Replies: 0
• Views: 3,284
02-27-2011, 07:26 PM
41. ### 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...

• Replies: 5
• Views: 5,032
02-28-2011, 12:36 AM
42. ### 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,...

• Replies: 2
• Views: 5,085
02-28-2011, 12:09 PM
43. ### 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...

• Replies: 0
• Views: 2,201
03-01-2011, 04:14 PM
44. ### 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...

• Replies: 0
• Views: 5,178
03-01-2011, 05:27 PM
45. ### 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...

• Replies: 17
• Views: 10,700
03-02-2011, 10:59 AM
46. ### 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...

• Replies: 1
• Views: 3,200
03-02-2011, 01:31 PM
47. ### 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. ...

• Replies: 4
• Views: 4,291
03-02-2011, 04:25 PM
48. ### 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...

• Replies: 0
• Views: 3,606
03-03-2011, 03:48 AM
49. ### regression analysis for massive data sets

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

• Replies: 1
• Views: 2,580
03-03-2011, 11:23 AM
50. ### 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...

• Replies: 3
• Views: 3,823
03-03-2011, 05:52 PM
51. ### 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...

• Replies: 2
• Views: 2,205
BGM
03-04-2011, 04:03 AM
52. ### 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....

• Replies: 0
• Views: 3,511
03-04-2011, 09:55 AM
53. ### 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...

• Replies: 3
• Views: 18,881
03-04-2011, 12:20 PM
54. ### 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...

• Replies: 1
• Views: 3,426
03-05-2011, 04:22 AM
55. ### 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...

• Replies: 1
• Views: 3,060
03-05-2011, 09:23 AM
56. ### 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...

• Replies: 0
• Views: 2,779
03-05-2011, 06:18 PM

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