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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### The Connection between conditional expectation and unconditional expectation

William Greene, Econometric Analysis, 7th edition, 20th page: The zero conditional mean implies that the unconditional mean is also zero, since E...

• Replies: 3
• Views: 12,484
10-02-2011, 02:18 PM
2. ### Regression with an Index as a dependent variable

Dear all, I need help with a regression. My dependent variable is an index (ranging from 0 to 1). My independent variables are a dummy and a...

• Replies: 2
• Views: 12,476
03-31-2014, 06:13 AM
3. ### hierarchical regression for controlling variables?

For my dissertation, my supervisor told me to do a regression analysis and control for 2 variables. So should I report in my dissertation that I have...

• Replies: 15
• Views: 12,392
08-07-2012, 09:41 AM
4. ### linear regression model: LSE, Var, Cov etc

Studying for a test.. can anyone check my solutions for (a)-(c) and give me any help on (d)? Any help would be appreciated. Consider the model Yi...

• Replies: 2
• Views: 12,367
06-04-2009, 08:24 PM
5. ### What is the history of regression analysis?

Hi all, Recently, I am using regression analysis to do a geophysics study. Now the study is almost done. I start to write my report. I want to add...

• Replies: 4
• Views: 12,263
01-12-2010, 12:22 PM
6. ### Logistic Regression or Chi Square?

Hi everyone, I am a stats noob and am currently doing my fourth year thesis, examining moral development in children and adolescents. My design so...

• Replies: 4
• Views: 12,255
09-03-2012, 08:34 AM
7. ### Sum of squares proof

Hallo Im tring to prove that correct sum of cross products Sxy = Sum of (Xi)(Yi) - n XiYi given that Sxy = Sum of (Xi - Xbar)(Yi - Ybar). Can you...

• Replies: 4
• Views: 12,210
09-29-2011, 03:22 AM
8. ### Extremely large Odds Ratios?!

Hi, I've conducted a binary logistic regression with 1 independent variable (Type of property: flat/maisnette, terraced, semi-detached, detached and...

• Replies: 4
• Views: 12,168
12-13-2012, 10:19 AM
9. ### ANCOVA controversy?

Hello all, I have a question regarding ANCOVA, which seems straightforward, however an answer has eluded me. The question is: Can a...

• Replies: 3
• Views: 12,088
11-03-2009, 08:30 PM
10. ### multiple regression - beta coefficient - beta above 1

Hey, I have a problem concerning multiple regression analyses and the beta coefficient. I conducted a multiple regression analysis with two...

• Replies: 1
• Views: 11,882
03-03-2009, 05:06 PM
11. ### Multivariate regression with paired samples?

Hello, First time poster here. I have data from two groups of people recorded during two different conditions. I would like to study how the...

• Replies: 10
• Views: 11,811
02-27-2016, 11:51 PM
12. ### Firm Fixed Effects

In some regressions the the authors control for “firm fixed effects”. What does that mean? What are Firm fixed effects specifically? Are they just...

• Replies: 4
• Views: 11,681
12-15-2011, 08:22 AM
13. ### Dissertation help with Likert scale

Hello, I'm having some problems with the stats for my dissertation. My dissertation is about the effect of the physical surroundings of a...

• Replies: 9
• Views: 11,531
04-16-2008, 01:27 PM
14. ### Estimation method for ratio dependent variable?

Hi, Logistic regression is used if the dependent variable is a discrete choice variable. My dependent variable is not a discrete choice variable,...

• Replies: 4
• Views: 11,506
11-12-2010, 05:30 AM
15. ### Standard Deviation or Response / Prediction - Linear Regression

Hi, I'm hoping someone out there can help me with what is probably a very simple question. For a stats assignment, I've created a linear...

• Replies: 4
• Views: 11,474
10-20-2008, 04:47 AM
16. ### Regression with a categorical moderator (with 3 catoegories)

Hi All. I am wanting to run a moderating regression. But my moderator has 3 categories(Black, Asian, White). Usually, with a dichotomous...

• Replies: 6
• Views: 11,335
08-27-2010, 07:50 AM
17. ### 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: 11,266
01-23-2011, 12:39 PM
18. ### Confusion over how to calculate regression coefficient

I'm trying to find the regression coefficient of one set of a data on another. There is a linear relationship between the two sets of data. After a...

• Replies: 6
• Views: 11,265
06-22-2011, 01:33 PM
19. ### negative AIC ?

Hello, I ran model selection by delta AIC but encountered most of the AIC as negative. (R package AICcmodavg and stat : AIC) As reviewed by...

• Replies: 3
• Views: 11,181
08-03-2010, 12:03 PM
20. ### Reporting Logistic Regression in APA 6th Ed.

Hello. I am trying to write up logistic regression with two predictors (one entered in step 1, and one entered in step 2) and then the interaction...

• Replies: 1
• Views: 11,098
09-20-2012, 04:58 AM
21. ### Logistic regression and correlation

Hi I'm building an account management scorecard with logistic regression. Some of the variables have quite large correlations, but they get selected...

• Replies: 5
• Views: 10,972
04-24-2013, 05:00 PM
22. ### Coefficients and standard deviations

Hi, I have seen in a paper that the author states that the coefficient he gets in a regression implies that an increase of one standard deviation...

• Replies: 2
• Views: 10,907
07-05-2008, 04:58 PM
23. ### mahalanobis distance critical values > 10 df

dear all, analysing my dataset (N=1056) with SPSS for my Ph.D., I'm currently testing with linear multiple regression. before entering a...

• Replies: 0
• Views: 10,889
09-03-2009, 09:58 AM
24. ### Nonlinear regression using the Gauss-Newton algorithm in C

Hey guys, I'm being asked to program this up in C. If any of you know of any good references for the Gauss-Newton algorithm, please post them for...

• Replies: 7
• Views: 10,870
12-17-2010, 10:56 AM
25. ### SPSS- logistic regression, three patient groups, ROC curve

Hi all, I have three groups of patients, and 6 variables for each patient. I want to combine these variables and make a multiclass ROC curve, in...

• Replies: 4
• Views: 10,859
11-11-2012, 09:54 AM
26. ### 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: 10,741
03-02-2011, 10:59 AM
27. ### Multiple Regression and Confounding Factors

I am working on my thesis project which involves analyzing whether a dichotomous independent variable has an effect on a continuous dependent...

• Replies: 3
• Views: 10,581
02-13-2012, 09:45 AM
28. ### Regression with sqrt transformed dependent variable - meaning of the model's B value?

Hi fellow nerds :) My dependent variable had to be transformed by square root (so the residual plot would be normal). I usually use log10...

• Replies: 3
• Views: 10,579
06-16-2012, 12:28 PM
29. ### insignificant variables- what to do?

Hello, I'm running a few regressions for an econometrics paper and have a question: should insignificant independent variables be omitted from...

• Replies: 2
• Views: 10,548
12-04-2010, 01:23 AM
30. ### R squared change test for logistic regression

Some call this F change tests other hieararchical regression (not to be confused with multilevel regression which is also called that by some). It...

• Replies: 13
• Views: 10,532
01-08-2013, 06:17 PM
31. ### How to Calculate the Coefficient of Multiple Regression

Hi Statistic Gurus I'm not really familar with multiple linear regression, and despite countless hours on google, I havn't found any clear...

• Replies: 2
• Views: 10,449
02-24-2010, 07:24 AM
32. ### cooks distance cutoff

Hello, I urgently need to find out what is happening in regards to below: I am doing a huge number of simple linear regressions. For each...

• Replies: 9
• Views: 10,425
08-08-2014, 10:18 PM
33. ### BOX-COX transformation - Correct method

Dear All, I fitted a quadratic model to a set of data. I am trying to apply the box-cox transformation to check if my data should be transformed....

• Replies: 2
• Views: 10,382
09-08-2010, 09:44 AM
34. ### Sum of Residual equal to zero

I want to know why when you multiply the residual by Y_hat the sum of this new equation is still zero? So in other words I have summation from 1...

• Replies: 4
• Views: 10,302
08-07-2011, 11:17 PM
35. ### Multivariate normality

I know various methods of determing if the bivariate relationship of two variables are normal. But, as Dason has drilled into me, its multivariate...

• Replies: 50
• Views: 10,116
09-02-2013, 10:04 PM
36. ### Beta positive - Slope of best fit line negative

hello, scratching my head over some regression output i'm getting from Excel. as you can see from below, the best fit line on my indeptendent...

• Replies: 16
• Views: 10,042
12-01-2011, 03:20 PM
37. ### Insignificant coefficient in one model becomes significant in another model--???

Aloha, A multiple regression finding is puzzling my adviser and I. Overall goal--to see if caregiver status (dummy, 0/1) and job variables...

• Replies: 3
• Views: 9,897
05-10-2012, 07:21 PM
38. ### Logistic Regression: attaching 95% CI to predicted probabilities

Hi All, I was wondering how calculate 95% CI for predicted probabilities. I have read how to do the same for odd-ratios, but the way in which what...

• Replies: 6
• Views: 9,896
12-02-2013, 04:54 PM
39. ### How to antilog a regression

Hi, My excel regression produced the following: Coefficient Constant 6.5804 Log(Unit_Produced) -0.4752 The...

• Replies: 4
• Views: 9,877
12-11-2011, 05:12 PM
40. ### Four-way interaction in linear regression

Dear all, I have 4 independent variables, and I want to check their combined and interrelated effects on 1 dependent variable (thus 1 y and 4...

• Replies: 2
• Views: 9,862
09-14-2010, 01:33 PM
41. ### Logistic Regression: Testing for interaction effects with many covariates

Hello everyone! As topic states, I am running a logistic regression with quite a lot of independent variables (23). There are a lot more candidate...

• Replies: 3
• Views: 9,858
01-20-2012, 01:01 PM
42. ### 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: 9,852
02-18-2011, 05:20 PM
43. ### Multiple regression test of significance using r squared

I have a multiple regression with 5 independent variables, and obtained the r^2. Then I removed two IVs, and get the R^2 for the reduced model with...

• Replies: 4
• Views: 9,751
04-19-2011, 05:06 PM
44. ### confidence and prediction interval

Let's say I have the following data: y: 19.695 77.310 138.938 16.382 36.249 111.078 9.497 61.270 42.804 52.931 x: 4.0860 8.6203 11.6592 3.6581...

• Replies: 1
• Views: 9,738
10-20-2005, 08:13 AM
45. ### 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: 9,721
02-04-2011, 11:34 AM
46. ### Non parametric equivalent to multiple regression?

Hi everyone! My sample size is only 15. Is there a nonparametric equivalent to multiple regression? I have five predictors which correlate (using...

• Replies: 2
• Views: 9,713
04-17-2010, 08:26 PM
47. ### how to detect outliers for logistic regression model

Hello, I am working on a logistic regression model. For several continuous variables, I need to detect outliers. What shall I do to detect outliers?I...

• Replies: 3
• Views: 9,647
10-31-2013, 08:11 AM
48. ### How do you calculate B1 from a regression formula?

I have this question, which essentially asks me to find B1, I know the answer is -2.28 but can't work out how to get it! Thanks in advance everyone....

• Replies: 0
• Views: 9,645
12-15-2010, 09:01 AM
49. ### Univariate vs Multivariate Analysis, Quick Question

Hey guys, I have a very quick question! I'm presenting a medical research paper and it uses univariate and multivariate analysis. Sometimes a...

• Replies: 4
• Views: 9,555
11-07-2011, 04:32 PM
50. ### Multiple Regression: real-world example

Everyone in my Advanced Stats class is completely stuck on this assignment, I don't know where else to turn... Using the paper/article "Predictors...

• Replies: 3
• Views: 9,541
02-07-2013, 01:07 PM
51. ### Logistic Regression Skewed Data with Lots of zeros!

Hello, I am working on a Logistic Regression where the results that I am getting are not satisfactory. The hosmer and lemeshow test is being...

• Replies: 9
• Views: 9,535
04-24-2013, 05:58 PM
52. ### Assumptions of Linear Regression and Time Series

Greetings, I am kind of confused while reading topics of Linear Regression and Time Series. There are bunch of assumptions to infer proper...

• Replies: 1
• Views: 9,426
01-18-2012, 12:05 PM
53. ### Regression and Likert scale variable..HELP!

Hi everybody, I'm wondering if it is possible to run a multiple regression with a dependent variable measured on a 5-point Likert scale (where 1...

• Replies: 11
• Views: 9,393
11-01-2010, 04:45 AM
54. ### Understanding Multilevel Model

I'm slowly working through multilevel models and have a pretty specific question/though checking. Here's some R code: library(lme4);...

• Replies: 47
• Views: 9,382
02-23-2014, 11:48 PM
55. ### Hosmer-Lemeshow

Hi! How do you discussion the vaule for the Hosmer-Lemeshow goodness of fitt in a logistic regression? I tha value 0,290 bad? Regards!

• Replies: 7
• Views: 9,328
04-04-2011, 07:24 AM
56. ### confusion about Ho/Ha hypothesis for simple/multiple regression

The one thing I do not understand (and my book doesn't explain) is how do you determine if it's Ha > 0, Ha < 0 or Ha =/= 0? Anyone can shed some...

• Replies: 2
• Views: 9,323
12-08-2009, 08:14 PM

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