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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### 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: 3,002
02-16-2011, 01:49 PM
2. ### 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: 15,365
02-16-2011, 01:49 PM
3. ### 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: 2,000
02-16-2011, 11:31 AM
4. ### 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: 2,136
02-15-2011, 10:46 PM
5. ### 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: 3,034
02-15-2011, 05:12 PM
6. ### 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: 2,489
02-13-2011, 02:59 PM
7. ### Moved: single observation multi-year variables

• Replies: -
• Views: -
02-13-2011, 10:10 AM
8. ### [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: 5,360
02-10-2011, 12:27 AM
9. ### 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: 4,803
02-09-2011, 04:51 PM
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...

• Replies: 2
• Views: 2,936
02-08-2011, 06:09 PM
11. ### 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: 3,180
02-08-2011, 06:00 PM
12. ### 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: 2,086
02-08-2011, 03:50 PM
13. ### 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: 5,277
02-04-2011, 01:51 PM
14. ### 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: 9,751
02-04-2011, 11:34 AM
15. ### 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: 3,620
02-03-2011, 12:53 PM
16. ### 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: 1,712
02-02-2011, 05:59 AM
17. ### 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: 4,612
01-31-2011, 04:32 AM
18. ### 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: 2,470
01-30-2011, 03:33 PM
19. ### Need Help - Dummy variable for GDP per capita

• Replies: 1
• Views: 3,894
01-29-2011, 09:39 AM
20. ### Need help! Fairly simple questions.

Hey guys, So I successfully proved that the sum of epsilons (the e in y=B0+B1*x+e) equaled 0. Now how do I prove that the sum of xi's...

• Replies: 0
• Views: 2,305
01-27-2011, 09:29 PM
21. ### Help Non linear Growth Models - Derivates

Hi!!! im amateur in mathemathicals growth models but im doing my graduated work in adjust five differents models in some growth parameters in onion,...

• Replies: 0
• Views: 2,476
01-27-2011, 06:59 PM
22. ### LSVD regression - how many dummies

hey, I'm back and making progress :) I want to run a LSDV regression on my panel data. How many dummies do I have to include? All of them for...

• Replies: 0
• Views: 2,692
01-27-2011, 09:13 AM
23. ### GLM repeated measurements with very large database

I am trying to perform a multivariate regression analysis in SPSS. The problem is the database is very large (one variable contains over 200.000...

• Replies: 0
• Views: 2,925
01-27-2011, 08:42 AM
24. ### identification with ordinal independent variable

Hi, Can you help me find the relevant literature for this problem? My regression model is: Yi=Xi*b+Ei, where Yi is income and Xi is a score, Ei...

• Replies: 1
• Views: 3,060
01-26-2011, 10:15 PM
25. ### Interpreting unstandardized coefficients and their strength

Hi, I conducted a multiple regression analysis with 2 independent variables. Now I'm trying to analyze the strength of these variables between men...

• Replies: 0
• Views: 5,525
01-26-2011, 03:32 PM
26. ### AIC number of parameter

Dear all, I am new in this forum. I m facing a problem with my AIC. I m using model selection framework (Akaike’s weights) with various type...

• Replies: 0
• Views: 3,915
01-23-2011, 07:31 PM
27. ### multinomial logistic regression vs multivariate logistic regression

multinomial logistic regression vs multivariate logistic regression. Is there differences??? If so how to do with spss multivariate logistic...

• Replies: 2
• Views: 11,305
01-23-2011, 12:39 PM
28. ### Stepwise Regression

When a variable is added and then removed in stepwise regression, what happens to the proportion of the variance it explained?

• Replies: 1
• Views: 3,667
01-23-2011, 01:06 AM
29. ### Panel Data and model specification

Sorry to ask questions which may be obvious to many, but I am just starting out with Stata and econometrics so if anyone could help me I would really...

• Replies: 1
• Views: 4,224
01-22-2011, 12:23 AM
30. ### i cant understand this question :|

Hi everyone , i had small problem with this question i don't know what Sxx Syy Sxy and C.I mean? i wanna find the roles to follow but i couldn't ...

• Replies: 1
• Views: 3,196
01-20-2011, 12:04 PM
31. ### Desperately Need Help with Regression Analysis..Please :)

hello :) I'm new here (and in doing statistics in general). I have to do a regression analysis on panel data (10 groups, 9 years - 90...

• Replies: 4
• Views: 3,490
01-20-2011, 11:17 AM
32. ### partial R2 in multivariate linear regression

Hi there! I´m performing multivariable linear regression models with SPSS. I would like to know how can I calculate partial R2 for the independant...

• Replies: 0
• Views: 5,748
01-18-2011, 07:12 AM
33. ### Regression R2 vs Spearman's correlation

Hi everyone! I have a set of data that shows a very good Spearman's correlation coefficient (p=0,001), but when i calculate a regression equation...

• Replies: 3
• Views: 19,863
01-17-2011, 02:32 PM
34. ### Collinearity

Hi, Is there any possibility that if colinearity exists between two or more DV variables in a regression analysis, the regression analysis to be...

• Replies: 3
• Views: 6,070
01-17-2011, 08:00 AM
35. ### Insignificant regression explanation-HELP!!!

Hi, As part of my dissertation I am doing a regression analysis in which I am examining if gender, age, Internet use, education and occupational...

• Replies: 5
• Views: 25,398
01-16-2011, 01:24 PM
36. ### Poisson GLM: data set use; influence of counts

Hello Regression form, I am after a explanation in layman's terms of what's going on behind the scenes with a couple of GLM analyses I'm doing. ...

• Replies: 0
• Views: 4,432
01-16-2011, 02:46 AM
37. ### Reporting hierarchical regression

I have a 2-step hierarchical regression. Step 1 Variable A = significant p<.001 Step 2 Variable A = now non significant Variable B =...

• Replies: 2
• Views: 5,434
01-15-2011, 07:01 AM
38. ### Interpreting Interactions in Binary Logistic Regression

Hi! I was wondering if anyone knows how to interpret interactions in SPSS, for logistic regressions, or how a good source that might outline this....

• Replies: 1
• Views: 8,740
01-13-2011, 08:23 PM
39. ### CLS vs OLS

What is the difference between classical least squares regression (CLSR) and linear least squares regression (also known as ordinary least squares...

• Replies: 0
• Views: 3,903
01-13-2011, 08:16 PM
40. ### Random effect

Hello everybody! I have some problems making a regression. I am told that to correct my data by using random effect. I don'nt know how this...

• Replies: 1
• Views: 2,145
01-13-2011, 01:59 PM
41. ### Lack to fit in bayesian beta regression model

Hello! I have a question about beta regression model. I fitted a bayesian beta regression. - Coefficients are probabilistically (using the...

• Replies: 0
• Views: 2,756
01-13-2011, 09:37 AM
42. ### Sparse Logistic regression

What method should be used when the proportions of 1's in a logistic regression problem is very low. (lets say 0.04%)???? Normal logistic method...

• Replies: 2
• Views: 2,753
01-13-2011, 08:01 AM
43. ### Reference for max vars in a model

I used 7 predictor variables in a regression model with a sample size of 103. Someone who reviewed my manuscript said that was too many predictors. ...

• Replies: 2
• Views: 3,015
01-11-2011, 02:07 AM
44. ### Problem with mixed effects model with binary data

Hi guys, I have a question about logit mixed effects model. I tried to use lmer to fit a model with binary dependent variable (Yes or No), a...

• Replies: 2
• Views: 4,266
01-10-2011, 01:00 AM
45. ### How to convert logistic Coefficient into percentage %

Hi Please I need help with conveting logistic Coefficient into percentage % to help me with analysing the regression. Regards Mod Note:...

• Replies: 0
• Views: 5,639
01-09-2011, 02:36 PM
46. ### Heteroscedasticity

Hello, I've done a search on this but have not found any similar threads. Using EVIEWS White test I have identified heteroscedasticity in my...

• Replies: 1
• Views: 4,774
01-09-2011, 01:44 PM
47. ### multiple regression with *many* variables

Hello I am not a statistician but interested in knowing how the following problem would be approached by those who are. What would you do if...

• Replies: 9
• Views: 18,845
01-09-2011, 09:35 AM
48. ### Easy question

Dear friends: I hope you can help me with this question: I have data of the identity for the GDP=C+I+G+X-M. If I regress C+I+G+X-M, in log...

• Replies: 1
• Views: 2,307
01-08-2011, 09:36 PM
49. ### Multinomial Regression

have a dependent variable with 2+ categories and I know how to run multinomial regression with it. However, in multinomial regression you need to...

• Replies: 0
• Views: 2,339
01-07-2011, 02:10 PM
50. ### P value results

Dear Colleagues I did a bivariate regression using 10 independent variables on each dependent variable. all the results are significant at 95%...

• Replies: 7
• Views: 5,050
01-06-2011, 07:08 PM
51. ### Transformation of variable

Hi All, I am doing simple linear regression and there is curvilinear curve in the scatter plot of the independent and dependent variable. y =...

• Replies: 0
• Views: 2,918
01-05-2011, 10:45 AM
52. ### Cook distance and leverage

I have a data point for which leverage value is > 3(p+1)/n but the value of cook's distance is < 1. Can i say that, this is an outlier but it is...

• Replies: 1
• Views: 5,563
01-02-2011, 07:33 PM
53. ### Regression and Monte Carlo Randomisation

Hi all, I'm currently working with some data in which there are 33 groups of 3 people, with roughly 100,000 datapoints per group. There are two...

• Replies: 1
• Views: 2,562
01-02-2011, 06:56 AM
54. ### How to check the importance of Dummy variable in multiple regression?

Hi All, I am doing a Multiple regression with one non numeric independent variable. I changed this variable into a dummy variable which is now...

• Replies: 2
• Views: 7,732
01-02-2011, 04:33 AM
55. ### Multiple regression with SPSS

Hi All, I have done multiple regression in SPSS with three different methods, namely, FORWARD, BACKWARD and STEPWISE. Final outcome is...

• Replies: 2
• Views: 14,037
01-01-2011, 01:39 PM

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