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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Multiple Regression - Interpreting t-stat

Hi all, If the model fit is satisfactory (ie. R-squared value is sufficiently high), how should the t-stat be interpreted... my reading indicated...

• Replies: 1
• Views: 106,729
08-29-2006, 01:56 PM
2. ### The assumptions of multiple regression: An article by TalkStatters!

Hi everyone, A lot of you are aware of this already, but I'm posting this to a public subforum on Quark's suggestion :) Recently a group of 3...

• Replies: 3
• Views: 91,939
12-21-2015, 02:02 PM
3. ### 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...

• Replies: 47
• Views: 84,361
11-29-2011, 07:40 PM
4. ### Linear regression with non-normal data?

It is my understanding that for linear regression both data sets must be normally distributed. One of my two sets of data (x) is normally...

• Replies: 43
• Views: 81,254
07-15-2013, 10:15 PM
5. ### obtaining β(hat)s from weighted least square regression

I'm doing Regression analysis under stratified random sampling for my research since it's usually assumed in many textbooks that the data is simple...

• Replies: 0
• Views: 61,133
06-27-2011, 11:06 PM
6. ### Postive correlation but negative coefficient in regression??

Im a little confused by some results I have..... I have two predictor variables and an outcome variable. The first predictor is positively...

• Replies: 23
• Views: 57,487
10-07-2016, 04:31 AM
7. ### 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)...

• Replies: 11
• Views: 56,643
12-11-2011, 12:32 PM
8. ### 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...

• Replies: 4
• Views: 52,712
03-28-2011, 08:14 PM
9. ### how to prove COV(y bar, estimated beta1) in linear regression equals 0

Yi=Xi*beta1 + beta0 + error Prove: COV(average of Yi, estimated beta1) = 0 Thanks!

• Replies: 24
• Views: 44,065
09-10-2015, 12:27 AM
10. ### Price Elasticity based on log regression

Hello genius people!! 1) If i understand correctly, In the regression equation below, WS= White shoes BS=Black shoes Sales of WS = β1...

• Replies: 9
• Views: 43,103
02-04-2013, 01:26 PM
11. ### univariate vs multivariate

Hi, I have a question about interpreting univariate vs. multivariate (linear) regression. When I'm reading journal articles often both approaches...

• Replies: 5
• Views: 41,641
04-02-2013, 05:41 AM
12. ### Collinearity Among Categorical Variables in Regression

Does anyone have any knowledge and/or experience in how to measure collinearity between categorical variables that have more than 2 categories in the...

• Replies: 6
• Views: 36,021
01-25-2012, 03:52 PM
13. ### Standard error of multiple regression coefficients

I was revising my undergraduate courses of Statistics which I took before 20 years. I was exercising how to construct ANOVA table for a regression...

• Replies: 14
• Views: 34,957
12-11-2009, 07:49 PM
14. ### Proper Interpretation of odds ratio less than 1 for my study

Hello everyone, This is for a PhD, research in psycholinguistics. I have done logistic regression analyses where some chosen predictor...

• Replies: 18
• Views: 33,635
03-25-2016, 03:55 PM
15. ### Multiple Regression and Likert Scale Data

With multiple regression, is it necessary to recode independent variables that are measured using Likert Scale responses into dummy variables (with...

• Replies: 2
• Views: 31,301
03-25-2010, 10:03 AM
16. ### Linear Regression Without intercept ?

hello i m little confuse i want to know that when its is suitable to use regression without intercept ? Any advantage over using linear regression...

• Replies: 10
• Views: 29,592
08-21-2011, 02:34 AM
17. ### is there a non parametric alternative to multiple linear regression?

Hi all, I would like to know is there a non parametric alternative to multiple linear regression? when I google the quesion I get a lot of info...

• Replies: 7
• Views: 29,021
10-07-2010, 03:37 PM
18. ### Collinearity in Logistic Regression

If my independent variables are correlated in Linear Regression, I can first, check it using VIF, and solve it (PLS, other ways). What do I do if...

• Replies: 8
• Views: 28,169
08-24-2010, 01:50 AM
19. ### What to report in a mediation analysis

Hello Given my comprehensive lack of statistical knowledge, I have gained a lot of information over the last five months browsing this forum. But...

• Replies: 2
• Views: 27,233
08-28-2012, 07:10 PM
20. ### Mallow's Cp Statistic as criterion for regression

I am building a multiple regression model using stepwise procedures and using the minimum Mallow's CP statistic as criterion for adding variables to...

• Replies: 2
• Views: 26,821
01-07-2008, 06:58 AM
21. ### Calculating Omega Squared

Hi All I have been battling with my stats over the last two months and have managed, by reading books and researching the web, to stumble through...

• Replies: 2
• Views: 26,792
07-28-2009, 10:25 AM
22. ### 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: 26,745
01-16-2011, 01:24 PM
23. ### Testing for difference 2 regression models

Hello, I am working on multiple regressions at the moment and have come to a point that I need a little assistance. I have the following question:...

• Replies: 8
• Views: 26,488
11-29-2008, 11:29 AM
24. ### Hierarchical linear modeling – Increasing intercept variance component

I have run 12 hierarchical linear models, where students are nested in their workshop groups for certain university classes. The goal is to explain...

• Replies: 0
• Views: 26,398
08-27-2012, 12:52 PM
25. ### Hypotheses testing if R²=1

Dear all, Since the R² value of my regression model is one, I can neither conduct a t-test nor a F-test. Is this a problem with regard to...

• Replies: 21
• Views: 25,933
04-11-2014, 02:30 PM
26. ### near singular matrix error (dummy variable trap)

Hi, Im running a regression in eviews and have 11 dummy variables for 12 different industries. As i already dropped one i do not understand why i...

• Replies: 3
• Views: 25,588
06-23-2013, 01:54 AM
27. ### Is Slope A statistically different from Slope B? *URGENT*

Hey everyone, Really need urgent help here. I am trying to determine if the change in the slope of a line (beta) is statistically significant...

• Replies: 7
• Views: 25,480
03-06-2012, 11:39 AM
28. ### Moderation in Logistic Regression

Hi, looking at all the other topics, this is a very basic question, but for me it is really a brain cracker.. I have a conceptual model; ...

• Replies: 9
• Views: 25,443
04-04-2012, 05:36 AM
29. ### F-Statistic Question

I'm sorry for probably asking a foolish question, but my searches have yielded very limited results (as well as my reading) in regards to the...

• Replies: 6
• Views: 25,368
06-23-2008, 03:28 PM
30. ### Partial regression plots in R

Hey guys, I'm slowly converting myself from an SPSS user to an R user. I'm running a pretty basic multiple regression model and want to produce...

• Replies: 1
• Views: 24,859
04-24-2011, 01:39 PM
31. ### Can I use multivariate analysis without univariate analysis?

Dear all, I have a problem in my data analysis and paper writing. Some variables (dependents) were not statistically significantly correlated...

• Replies: 14
• Views: 24,653
01-26-2016, 11:08 AM
32. ### calculating multiple regression by hand

How would you calculate a regression equation such as Y = b1X1 + b2X2 + b3X3 + a by HAND??? I can find in textbooks the way to calculate two...

• Replies: 1
• Views: 24,460
11-11-2008, 12:04 AM
33. ### Time Series ARIMA(p,d,q) - how to determine what p, d and q equal?

Hello, I (think) understand that in order to determine the parameter values of an ARIMA(p,d,q) model, I need to look at three things: 1. PACF...

• Replies: 3
• Views: 23,777
08-21-2012, 07:32 AM
34. ### Binary Logistic Regression in R

Warning: this is going to be a long post. Acknowledgement: Thanks to The Ecologist for getting me started on what I hope is the right road. This...

• Replies: 24
• Views: 23,734
12-16-2008, 03:21 AM
35. ### Compare regression coëfficiënts in 2 models/ same sample, + 1 IV, SPSS

Dear all, I am doing a master thesis in criminology and am trying to detect confounding effects of response styles on theoretical models....

• Replies: 3
• Views: 23,734
07-30-2012, 02:45 PM
36. ### Interpreting White test for heteroskedasticity

Hello, i am using Gretl software and run a OLS regression on a set of panel data. I am trying to find out if there is hetereskedasticity in the...

• Replies: 1
• Views: 23,731
12-10-2013, 06:49 PM
37. ### What is LAG (time series question)

I have heard the term LAG used for time series and sort of have a very basic grasp of it. Could someone please try explaining it (in a very basic...

• Replies: 2
• Views: 23,360
08-14-2012, 07:50 AM
38. ### Regression questions

I have answered the questions below can someone please check them to make sure i have them right. I have answered the questions but need to have...

• Replies: 2
• Views: 23,297
06-27-2008, 09:27 AM
39. ### [Optimization – Solver] Good model fit, but wrong standard deviation coefficients

Dear reader, I am facing an optimization problem and, at this point, I need help from someone with more knowledge than me. My goal: For a...

• Replies: 1
• Views: 23,021
04-08-2013, 04:59 PM
40. ### Three way interactions in regression

Hi, I'm trying to figure out how to do three-way interactions with multiple regression. I am trying to predict an IV by a three DVs and the...

• Replies: 4
• Views: 22,773
03-20-2009, 11:49 PM
41. ### Interpreting regression coefficients (transformed)

Hello, I ran a GLM (poisson) analysis and have a list of my coefficients with their SEs. I need help interpreting the betas because the predictor...

• Replies: 14
• Views: 22,677
10-20-2011, 01:33 AM
42. ### what is cross section regression analysis?

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

• Replies: 1
• Views: 22,573
04-06-2011, 12:40 PM
43. ### how to calculate the significance of an R2 increase (based only on results in paper)

Recently I have come across several articles that report OLS results of models with increasing numbers of variables. In the articles the R2 and...

• Replies: 19
• Views: 22,460
11-17-2011, 09:27 AM
44. ### Interaction effect significant but main effects not

Hi all, I was wondering if anyone could give me a help with my logit. I have a DV of disease vs. non-disease and 3 IV: dummy-year (year 1 vs year...

• Replies: 12
• Views: 21,827
05-06-2013, 01:46 PM
45. ### Chi square and Wald chi square

What is the difference between wald chi square test and chi square test in regression analysis?

• Replies: 2
• Views: 21,690
06-20-2011, 01:26 PM
46. ### Did i get theese right i am confused, can anyone help me please

25. In multiple regression analysis, residual analysis is used to test the requirement that A) the variation in the residuals is the same for all...

• Replies: 2
• Views: 21,632
11-30-2008, 09:08 PM
47. ### Multiple Time Series Regression? Time Series with multiple independent variables

• Replies: 5
• Views: 21,606
09-26-2012, 09:03 AM
48. ### Relative contribution of variables in logistic regression

Hi, I have been using logistic regression to determine what influences the chances of a person becoming unemployed. A number of variables have all...

• Replies: 5
• Views: 21,577
08-23-2011, 05:18 AM
49. ### Multiple linear regression: partial F-test

"Suppose that in a MULTIPLE linear regression analysis, it is of interest to compare a model with 3 independent variables to a model with the same...

• Replies: 5
• Views: 21,269
06-20-2009, 11:32 AM
50. ### Help understanding Microsoft Excel ANOVA output (Significance F ?)

Hi, So I created my own very simple excel table, with a set of X and Y values, and then I told Excel to run a regression analysis. ...

• Replies: 8
• Views: 21,238
05-23-2013, 12:43 PM
51. ### Hosmer and Lemeshow Test is significant

Hi all, can anyone tell me if one can still use a model which reports a H&L test with significant chi-square? (I have a very large sample - + 100...

• Replies: 25
• Views: 21,109
05-16-2013, 09:49 AM
52. ### 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...

• Replies: 9
• Views: 21,012
12-11-2011, 09:02 PM
53. ### 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...

• Replies: 15
• Views: 20,922
12-14-2011, 02:36 PM
54. ### 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: 20,826
01-17-2011, 02:32 PM
55. ### 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: 19,937
03-04-2011, 12:20 PM
56. ### 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: 19,627
01-09-2011, 09:35 AM
57. ### Calculations for the unstandardized coefficients for a multiple regression analysis

I am looking to write a spreadsheet of the calculations for the unstandardized coefficients for a multiple regression analysis (the B values). ...

• Replies: 3
• Views: 19,617
11-11-2008, 04:53 AM

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