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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Confusion over the F-ratio in a hierarchical multiple regression

Hey all, I'm not used to work with multiple regression analysis, so I would be glad if anyone could help me interpreting this result: I...

• Replies: 1
• Views: 7,522
08-26-2013, 09:33 AM
2. ### Timeseries: sig. Ljung-box Q, but residuals normally distributed

Hi all, Hope someone can help me with the following problem/question I encounter. I'm working with a monthly time-serie consisting of 36 data...

• Replies: 4
• Views: 7,520
05-03-2012, 12:15 PM
3. ### Removing insignificant variables

Say I'm plotting a multivariate regression with five variables, and three of them come up statistically insignificant. Why is it important to try...

• Replies: 2
• Views: 7,477
03-21-2011, 01:49 AM
4. ### 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: 7,470
02-27-2011, 03:27 PM
5. ### test of non-linearity

I am reading an interesting econometric book where the author suggests testing if non-linearity exist by specifying a quadratic term, if its...

• Replies: 15
• Views: 7,456
06-30-2016, 02:24 PM
6. ### R^2 for linear multiple linear regression

I have two candidates for a linear regression model on y, say x_1, and x_2. So I get two linear regression model for each (b_i*x_i+a_i+e_i) each...

• Replies: 5
• Views: 7,437
05-12-2010, 04:25 PM
7. ### too many dummy variables

Hello I have a categorical independent variable, with 11 levels...so I need 10 dummy variables. I wanted to ask how can I analyze 10 dummy...

• Replies: 10
• Views: 7,410
07-20-2012, 02:55 AM
8. ### Moderated multiple regression and mixed factorial ANOVA

I conducted a moderated multiple regression and a mixed factorial ANOVA on the same variables and got two different results (using moderated multiple...

• Replies: 5
• Views: 7,407
08-27-2011, 03:52 PM
9. ### Sum of the residuals in multiple linear regression

In my textbook, the following results are proved in the context of SIMPLE linear regression: ∑e_i = 0 ∑(e_i)(Y_i hat)= 0 I tried to modify the...

• Replies: 1
• Views: 7,381
06-20-2009, 07:28 AM
10. ### Fixed Effects and interaction terms

I am trying to analyze sex difference in housework time using longitudinal data with Fixed Effects. Since, sex is time-invariant I can not...

• Replies: 2
• Views: 7,376
03-01-2012, 06:01 PM
11. ### Linear Regression - About R-squared and slope

My question is that why low or high R-squared has no bearing on whether the estimated slope has a causal interpretation. My explanation is because...

• Replies: 0
• Views: 7,371
03-20-2010, 12:01 PM
12. ### Need help with regression statistics analysis

Hello I need serious help. I did my last project fine. I've followed all my instructions for this final project, and did everything, but the part to...

• Replies: 20
• Views: 7,366
04-19-2006, 10:20 PM
13. ### Help with prediction interval problem

Construct the indicated prediction interval for an individual y. The equation of the regression line for the paired data below is = 3x and the...

• Replies: 0
• Views: 7,309
11-13-2006, 02:50 PM
14. ### Multiple Regression Repeated Measures with a continuous independent variable

I have a complete within-subjects 2x2x5 designs, i.e. all 12 subjects I have have done the 20 combinations of conditions. My problem is that the 3rd...

• Replies: 1
• Views: 7,309
10-29-2010, 08:47 PM
15. ### OLS + Serial Correlation + Cochrane-Orcutt Procedure

Hi Forum Experts, I am working through a OLS regression analysis where there is positive serial correlation in the independent variable over time....

• Replies: 2
• Views: 7,288
06-20-2011, 08:37 PM
16. ### Constant Elasticity Model

I was wondering if anyone could please try to help me understand where I'm going wrong with the following logic: I have been trying to look at a...

• Replies: 1
• Views: 7,270
10-23-2012, 09:31 AM
17. ### transform y to log(y)

Hi, I'm wondering what kind of data is appropriate for transforming the response y into log(y)? ( So the model becomes log(y)= a^x1 +...

• Replies: 10
• Views: 7,238
11-08-2010, 01:43 PM
18. ### Variables in Logistic Regression Analysis

I am trying to come up with a model to predict a binary dependent solution. I want to incorporate ordinal independant variables as the predictors. ...

• Replies: 2
• Views: 7,226
07-23-2010, 10:10 AM
19. ### coefficient changes direction with interaction term entered

Hi I'm running a logistic regression and my first model tests the direct effects of a variable (X) which is initially negative. In the second model...

• Replies: 2
• Views: 7,203
06-13-2011, 08:47 PM
20. ### Comparing regression models for transformed and untransformed data

I feel like I saw an answer to my question on here in the past, so I apologize if this is a repeat, but I have been unable to find the answer today...

• Replies: 2
• Views: 7,129
05-25-2011, 12:36 AM
21. ### 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...

• Replies: 9
• Views: 7,106
12-21-2011, 09:38 AM
22. ### Odds ratio of 1 for bivariate logistic regression

My wonderous memory is that an odds ratio near 1 is not remotely substantively important, much like a zero slope would be in OLS. But I have a highly...

• Replies: 14
• Views: 7,075
07-19-2014, 02:51 PM
23. ### Relationship between correlation matrix and R square

Hi there! I wonder if R-squared can be deemed a function of the correlation matrix (or the variance-covariance matrix)? The only ways to compute...

• Replies: 2
• Views: 6,994
01-22-2012, 09:54 AM
24. ### Linear Mixed Effects Regression

Hello, Please can anyone help me with the above topic. I'm using SAS and am unsure on how to program this. I think that a PROC MIXED is to be...

• Replies: 5
• Views: 6,970
12-10-2010, 07:14 AM
25. ### Linear regression with repeated measures

Hi, I have the following question: I have a dataset that contains data from 9 subjects that were tested twice for a couple variables. I try to do a...

• Replies: 2
• Views: 6,959
06-05-2010, 12:20 AM
26. ### Unstandardized regression coefficients

Hi all (first post :wave:), I've recently encountered some problems regarding unstandardized (partial) regression coefficients in my coursework. ...

• Replies: 0
• Views: 6,941
04-11-2010, 02:21 AM
27. ### Help with interpretation of Wald, chow, t-tests

Sorry about the double post - it is in the elementary forum as well. But I should have put it here to begin with. Thanks in advance. I hope you...

• Replies: 1
• Views: 6,925
04-30-2011, 05:30 PM
28. ### Help with low Durbin Watson value

I have a large table of time series data. I am trying to build a regression model and all assumptions are satisfied except independent errors. The DW...

• Replies: 1
• Views: 6,924
09-09-2012, 03:52 PM
29. ### Regression with latent variable

Hi, I'm doing some research for my dissertation and need to construct a latent variable that includes observations of various economic...

• Replies: 3
• Views: 6,922
04-17-2011, 01:11 PM
30. ### Penalty Analysis

Hi, how do we interpret the result of penalty analysis having negative mean drop (which is sig) as well as negative penalties (which is also sig)....

• Replies: 1
• Views: 6,869
07-13-2011, 09:16 PM
31. ### Doing correct backwards elimination with interaction terms?

I'm wondering about this, and I can't find an answer anywhere. My textbook (Agresti and Finlay 2009) clearly says how to do backwards elimination on...

• Replies: 15
• Views: 6,857
01-27-2015, 10:27 AM
32. ### 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...

• Replies: 4
• Views: 6,825
11-28-2011, 04:36 PM
33. ### Normalized dependent variable in regression

Hello I have normalized my DV to have normal residuals for regression analysis using natural logarithm transformation. However I'm confused about...

• Replies: 5
• Views: 6,818
10-21-2013, 08:11 AM
34. ### Logistic Regression with too many IV

Hi Guys, What would you do, if you had to build a logistic regression model, where you have 500 (!!) independent variables... ? Any manual best...

• Replies: 11
• Views: 6,810
04-01-2011, 12:45 PM
35. ### Check and develop my answers, multiple regression

This is the question, i was wondering if anyone could check if i did the correct thing, and help me develop my written answers if needed. a)...

• Replies: 4
• Views: 6,800
08-17-2008, 12:49 PM
36. ### MANOVA vs multiple ANOVAs

Hello everyone, For starters, I just found this site and am wondering where it has been all my life, or all my PhD, they feel like the same thing...

• Replies: 1
• Views: 6,783
11-18-2010, 11:24 PM
37. ### Model specification for Pooled Panel Regression

I am doing a research on the diversification potential of microfinancial assets. The methodology I use is a mean variance spanning test. I have to...

• Replies: 1
• Views: 6,778
03-27-2011, 09:06 PM
38. ### Logistic regression convergence issues

Hi Folks! I'm using logistic regression for classifying records into groups. The issue with logistic regression is that if any cell in the...

• Replies: 8
• Views: 6,772
04-04-2012, 01:12 PM
39. ### Should we remove non significant 1st order effects when interaction is significant

My question is simple: When you have a multiple regression equation which is: Y = a0 + a1.X1 + a2.X2 + a12.X1X2 is it correct to remove...

• Replies: 4
• Views: 6,758
08-20-2012, 10:02 AM
40. ### Multiple regression vs partial correlation

I have another question. I have only 40 patients and 5 domains (or factors) made of 16 (questionnaire) items. In order to get correlation...

• Replies: 1
• Views: 6,716
02-14-2006, 09:27 AM
41. ### Doing logistic regression using epi-info

Hi there! I'd really appreciate help with this one. I'm finding the prevalence of anemia and its determinants. There are about 23 factors that...

• Replies: 0
• Views: 6,711
12-10-2006, 05:01 AM
42. ### Regression analysis research project help.

Hi, I have a project i have to do for my regression analysis course. Basically I need to gather a bunch of data and plot it and find a regression...

• Replies: 1
• Views: 6,692
10-12-2010, 01:07 PM
43. ### Multicollinearity

Hello at everyone, I'm new at the site, and I'd appreciate your suggestions. I have a multiple -through the origin- regression model. Working with...

• Replies: 2
• Views: 6,677
08-24-2007, 06:49 PM
44. ### Comparing logistic regression nested models

I put this here rather than the SAS board, because I am not sure what I am saying about this test is correct. I have run across comments that you...

• Replies: 13
• Views: 6,647
04-29-2013, 03:51 PM
45. ### Multiple chi-square or logistic regression?

Hi, I'm new to statistics and am working on a project for work. I have read extensively and believe I am on the correct path, but would like to...

• Replies: 1
• Views: 6,626
06-22-2009, 07:36 PM
46. ### how to improve Arellano-Bond test for AR(2) in first differences in system GMM?

Hello, I am estimating my regression using system GMM. xtabond2 y L.y x1 x2 x3 yr2004-yr2011 z, gmm(y, lag(2 .) ) iv(x3 yr2004-yr2011,...

• Replies: 1
• Views: 6,613
02-13-2014, 11:18 AM
47. ### Need help on ( unadjusted and adjusted w / 95% cl) odds ratio

I am doing Logistic regression on spss. My dependent variable is test result (+ or -) independent variables are Age and Gender (M,F). How can i get...

• Replies: 1
• Views: 6,586
01-30-2012, 01:26 PM
48. ### Effect size in multiple regression

Hello, I'm using this this calculator to determine a rough sample size for a multiple regression (20 predictors). ...

• Replies: 5
• Views: 6,584
09-20-2012, 11:30 AM
49. ### Skewed dependent variable in logistic regression-how to handle

I am conducting research on juvenile firesetting with a child's self report of firesetting as my dependent variable.(0= never played with or set...

• Replies: 4
• Views: 6,577
11-08-2012, 07:18 PM
50. ### Need Urgent help in Kruskal's relative importance

Hi, My client wanted us to perform Kruskal's relative importance technique on some of their modeling work. We have reviewed lot of literature and...

• Replies: 2
• Views: 6,546
10-04-2011, 11:01 AM
51. ### GLM: Assumptions and choosing a model

Hello all, I have a question that I would be interested in hearing other's opinions/feedback. I have monthly cost data from 2006 to 2011 (72...

• Replies: 16
• Views: 6,517
08-24-2012, 06:26 PM
52. ### Lag Length for Breusch Godfrey with Cross Sectional data

Hey guys, I am working on my master thesis and I use STATA. I have cross-sectional data with not really a time component. However I ordered my...

• Replies: 6
• Views: 6,515
03-04-2014, 01:53 PM

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