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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Isolating Independent Variables

Question 1: How do I isolate an independent variable? Question 2: Once I know the independent variables impact how do I remove it from a timeline...

• Replies: 0
• Views: 5,024
03-26-2010, 02:02 PM
2. ### Interactions in regression analysis

Is their anyone who knows how to identify interactions between independent variables in a regression analysis? How does one use the output...

• Replies: 5
• Views: 5,022
06-09-2007, 09:42 PM
3. ### Fixed effects (FE) vs. Generalized Equations Estimation (GEE)

Friends, let me quickly give you the context of my question first: I am analyzing an unbalanced panel of 200 companies across 4 years. My research...

• Replies: 1
• Views: 5,008
06-25-2012, 04:50 PM
4. ### polytomous regression - help obtaining p for heterogeneity

I am using polytomous (aka multinomial) logistic regression to analyze some data. My outcome/dependent variable is nominal (unordered) with 4...

• Replies: 1
• Views: 5,004
09-25-2010, 06:58 PM
5. ### 4PL Non-Linear Regression, Transforming observed y values

Good Afternoon, I'm currently teaching my self how to fit response curves, and have run into some trouble. I currently need assistance on...

• Replies: 7
• Views: 4,999
10-22-2013, 12:33 PM
6. ### RegressIt: free Excel add-in for regression analysis

Regression Analysis forum members: I'd like to announce the release of a free Excel add-in for regression and multivariate data analysis which is...

• Replies: 2
• Views: 4,999
12-15-2014, 06:41 PM
7. ### Linear Regression Underestimating Sales Forecast

Guys, I want to share a flawed method i've been dealing with. I am currently using linear regression to find the coefficent of Year-over-year...

• Replies: 4
• Views: 4,994
05-28-2010, 07:59 AM
8. ### Is the difference significant.

I'm using stata since only a few weeks for my thesis. I can use some help regarding the following: I wanted to know what the mean grade is for...

• Replies: 0
• Views: 4,983
10-28-2010, 10:04 AM
9. ### (OLS) How to get sample variance-covariance matrix of residuals?

Consider the OLS: (1) y = a + b*x + e Where e is the error term. I understand that the population variance-covariance matrix for the residuals...

• Replies: 6
• Views: 4,971
07-16-2012, 10:02 AM
10. ### Finding standard error for elasticity (log-log model)

Hi guys, Can anyone help with this? In(sub) = 3.43 - 0.899 In(Price) + 0.374 In(Age) + 0.141 In(Age)In(Price) + 0.229 In(Characters) The...

• Replies: 0
• Views: 4,953
11-08-2010, 04:04 AM
11. ### Durbin-Watson table

Hi.. Anyone here know how to determine whether we violated the assumption for durbin watson test... i found the table but the max sample size is...

• Replies: 3
• Views: 4,941
11-29-2011, 11:11 AM
12. ### Tutorial Tobit Eviews 9

The tobit models, Also called a censored regression models (Tutorial Tobit Eviews 9) (Guide Tobit Eviews 9) (Regression Tobit Eview 9), is designed...

• Replies: 0
• Views: 4,939
12-11-2015, 12:53 AM
13. ### Transforming dependent variable

I am using a multiple regression with one continuous DV and 9 IVs (mainly categorical and one continuous). My DV, as the mean score on a...

• Replies: 3
• Views: 4,931
03-20-2012, 07:17 AM
14. ### Multiple Linear Regression: Transformation, testing of normality, heteroscedasticity

Hello everyone, I have a question that might be a basic one, but still I want to reassure myself that I am not on the wrong path by hearing the...

• Replies: 6
• Views: 4,917
06-28-2012, 09:18 AM
15. ### Which statistical test should I use?

I am struggling with my dissertation, as having collected my data, I am unsure of which test to use. I am investigating the differences in imagery...

• Replies: 4
• Views: 4,912
09-01-2011, 02:15 PM
16. ### How to deal with collinearity?

I am wondering what methods everyone uses to deal with collinearity. I recently came across this article http://bit.ly/14wDcgH But it doesn't really...

• Replies: 5
• Views: 4,901
09-09-2013, 03:14 PM
17. ### Prediction Region/Set from Multiple Logistic Regression

Hello all, I'm not sure how easy or difficult the following question actually is but for all my efforts I haven't been able to find the answer, if...

• Replies: 9
• Views: 4,898
06-11-2011, 12:54 AM
18. ### Multiple logistic Regression Power Analysis

Hi to everybody, Please does anybody can help me to solve this problem? I have a multiple logistic regression model with more than one BINARY...

• Replies: 1
• Views: 4,897
12-22-2008, 09:04 AM
19. ### Linear regression on ranked data

The dependent variable consists of a set of ranks for two types of project: Logistics and Engineering, to which I've applied a normal transformation....

• Replies: 0
• Views: 4,893
03-08-2011, 03:37 PM
20. ### Hlm?

I am working with a large data set, n = 1200+ average course grades culled from over 15,000 students from a school. I ran a regression using average...

• Replies: 9
• Views: 4,880
12-17-2008, 12:21 PM
21. ### IQ/achievement test correlation (rxy)

Working on creating new regression tables for determining the presence of learning disabilities. In order to do this, I need to determine a...

• Replies: 1
• Views: 4,878
09-09-2011, 04:02 PM
22. ### Multivariate Poisson regression

I have a linear model y=Ax where y and x are vectors and A is a matrix. The dimensionality of y is more than that of x. Further y has Poissonian...

• Replies: 2
• Views: 4,875
07-08-2010, 03:06 PM
23. ### Linear regression analysis - Urgent assistance required

Hi I am trying to examine the relation between ad. liking and attitude towards the brand. My hypothesis H1: "Commercials that are liked will...

• Replies: 6
• Views: 4,874
10-11-2009, 04:10 AM
24. ### Linear Regression Model with one variable and no constant

Hi, I've been given a problem sheet and I'd like some help as to start answering the questions, Given the model; Yi=β1Xi + ui a) show that this...

• Replies: 1
• Views: 4,871
12-07-2010, 10:15 PM
25. ### Repeat sales regression help

Hello everyone, I am in need of any help or guidance working on a repeat sales regression using spss. I am doing a repeat sales index on housing...

• Replies: 0
• Views: 4,867
04-05-2011, 04:36 PM
26. ### proof:variance

Hi, I want to find the variance of coeffiicient b(beta) in a regression without constant term(no intercept).I am not ]with variance algebra. I...

• Replies: 2
• Views: 4,862
04-15-2011, 09:27 AM
27. ### (easy) Maximum Likelihood Regression question...

hello everyone. i am trying to get my head around a very easy example that i read somewhere explaining maximum likelihood estimation on the OLS...

• Replies: 11
• Views: 4,844
08-27-2011, 02:33 PM
28. ### Performing a Pooled OLS Regression??

I am unsure which regression method approach to use in order to portray the following information: Let us assume that for over 5 years I have...

• Replies: 2
• Views: 4,843
08-27-2012, 10:57 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: 4,822
02-23-2011, 10:12 PM
30. ### Linear Regression for Traffic Data

Hi there, I have a two full years of traffic data by month and I am trying to predict traffic for the next two years based on historical growth...

• Replies: 3
• Views: 4,804
10-13-2010, 11:25 AM
31. ### Instrumental variable analysis

Dear people, In my simple regression analysis are two variables endogenous. GPAi = α + β•Wi +β•Wi^2 + θ•Si + θ•Si^2 + Qi•φ + εi Where Wi and Si...

• Replies: 0
• Views: 4,803
11-23-2010, 07:55 AM
32. ### Solution to the elements of statistical learning by Hastie, Tibshirani and Friedman

Hello, everyone, I am reading the book "the elements of statistical learning: data mining, inference, and prediction" authored by Hastie, Tibshirani...

• Replies: 0
• Views: 4,800
06-02-2014, 12:55 AM
33. ### Comparing two linear regression gradients?

Hi, I am completely new to linear regression so this may sound daft, but I'm wondering if its possible to test for a significant difference between...

• Replies: 6
• Views: 4,796
04-29-2015, 09:08 AM
34. ### [SOLVED] How to interpret negative regression estimate?

Hi, I’m learning about regression analysis and have negative estimates for the grade-point average variable in two categories of a multinomial...

• Replies: 10
• Views: 4,792
02-03-2012, 03:10 AM
35. ### what is: correlation? regression? confidence?

I need to learn statistics for a project I'm working on. I am totally lost and am spending more time than I thought I would on trying to understand...

• Replies: 1
• Views: 4,787
10-09-2009, 03:40 AM
36. ### Ordinary/Conditional Least Squares vs. Maximum Likelihood

Can anyone explain in layman's terms when we should use maximum likelihood as opposed to ordinary or conditional least squares for regression or time...

• Replies: 0
• Views: 4,780
03-26-2010, 12:38 PM
37. ### Linear Regression in Excel...

Hello everyone ! If you don't mind, a question regarding linear regression in Excel. I will be having a an Intro to Statistics test in May and...

• Replies: 4
• Views: 4,779
02-26-2009, 11:57 AM
38. ### 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: 4,779
02-09-2011, 04:51 PM
39. ### Goodness-of-fit for Poisson regression

Hello, I have a couple questions that I'd love some help with. Thanks very much for your time! I'm running a Poisson regression to look at...

• Replies: 1
• Views: 4,778
08-01-2012, 06:22 PM
40. ### Multicollinearity in Time Series Data

Hello all, this is my first post here -- hoping to find some helpful advice, and hope to dispense some in the future. Here is my situation: I am...

• Replies: 2
• Views: 4,770
02-08-2013, 01:44 PM
41. ### More than 2 categorical variable+1 continuous variable as independent variable

I am a civil engineering student and have no relation with statistics. Now I am working on my master thesis and I have got to work on SPSS now, which...

• Replies: 2
• Views: 4,756
02-18-2013, 10:21 AM
42. ### Polynomial regression...how to solve a complex quadratic equation

Hi, The regression in question is: y= 216.44 -109.37X + 25.969 X^2 - 1.7699 X^3 where y = strength of strand board and X = amount of glue used...

• Replies: 1
• Views: 4,755
01-02-2012, 01:30 PM
43. ### 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: 4,750
01-09-2011, 01:44 PM
44. ### Dummy Variables

Is there a limit to the number of independent variables that can be dummy coded for multiple regression as well as linear regression. In other words,...

• Replies: 18
• Views: 4,743
08-20-2012, 05:15 PM
45. ### Survey Results & Regression Analysis..Dummy Variable?

Hello All. I have just received results back from a survey that I launched and I need help on how to analyze the results. There may be some need...

• Replies: 1
• Views: 4,739
12-04-2010, 01:08 AM
46. ### p-value and conditional heteroskedasticity

Hello, conditional heteroskedasticity affects the standard error coefficient (in a t-test, multiple regression), but does not affect the...

• Replies: 0
• Views: 4,736
04-02-2010, 02:54 PM
47. ### Non constant variance in residuals?

Hi, When doing Linear Regression or Generalised Linear Modelling, and the residuals show non constant variance, how do you remove it? For example,...

• Replies: 3
• Views: 4,733
03-28-2013, 08:57 PM
48. ### Interaction significant but simple slopes not significant?

I have run a forum search and an internet search, and tried posting this question on other forums, but have been unable to find an answer to my...

• Replies: 2
• Views: 4,727
06-10-2015, 09:32 AM
49. ### Vuong test

Dear, I am trying to perform a Vuong-test to compare a Two-Step Heckman approach to a Double Hurdle approach. The paper of Humphreys...

• Replies: 0
• Views: 4,725
06-16-2012, 04:46 AM
50. ### Multiple Logistic Regression: Interpreting Insignificant Variables

I ran a multiple regression, using the following categorical dependent variables which ranked current job satisfaction: 0=not satisfied at all...

• Replies: 1
• Views: 4,720
06-03-2012, 03:47 PM
51. ### Violation of linearity assumption

Hi, I'm a beginner at statistics. I'm doing a simple linear regression and I have a scatterplot of the residuals versus the predicted values and I...

• Replies: 10
• Views: 4,703
03-09-2013, 10:47 AM
52. ### [SPSS - Logistic Regression] Resolve the linearity of logit assumption

I am running a logistic regression and my income variable violates the linearity of the logit assumption. It is not negatively effecting the...

• Replies: 3
• Views: 4,695
05-06-2015, 08:42 AM
53. ### Binary Logistic Regression with Multiple Data Points

Does anybody know how to run a regression on binary outcome data, with categorical predictors, where multiple subjects each have multiple outcome...

• Replies: 1
• Views: 4,677
BGM
04-10-2010, 04:26 AM
54. ### Panel Data Regression using Stata/SPSS

Please I need help. I am trying to run multiple regression analysis using SPSS and Stata but what am getting is not good at all. Can anybody help?...

• Replies: 0
• Views: 4,677
08-30-2011, 05:56 AM
55. ### Help with Regression Interpretation

Hi - Thanks in advance for any help or advice on this! I know very little about statistics, but I have performed a multiple regression analysis in...

• Replies: 3
• Views: 4,645
03-11-2010, 08:57 AM
56. ### What means "1/X weighted multiple regression"

What means 1/X weighted multiple regression? Is it just WLS with weights = "1/X" or I'm missing smth? :confused:

• Replies: 1
• Views: 4,642
12-12-2009, 01:42 PM
57. ### natural log of DV [or not?] in OLS regression? and collinearity questions for IVs

First I want to thank anyone who responds in advance. I'm grateful for any teaching I can get. Secondly, I'm math challenged. And my stats...

• Replies: 7
• Views: 4,633
07-05-2012, 10:26 PM
58. ### Negative value of the constant term..?

Hi, My name is Roy Klaassen, currently writing my master thesis in the field of marketing management (Tilburg University, the Netherlands). My...

• Replies: 2
• Views: 4,631
10-31-2011, 08:10 AM

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