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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### P Values on the Intercept

Hi, I have done a regressional analysis of a data set based on promotions to test the hypothesis that a specific qualification / specialisation...

• Replies: 2
• Views: 4,432
10-11-2011, 01:38 PM
2. ### GLM help with interactions

I have a regression model I am trying to build using GLM. I have a continuous response variable, a main variable of interest that is dichotomous and...

• Replies: 1
• Views: 2,582
10-11-2011, 04:47 PM
3. ### Ways of showing for bivariate data

Hello, What are the ways of showing that the bivariate date fits the simple regression model? One of the ways is showing the correlation between...

• Replies: 2
• Views: 2,814
10-13-2011, 01:40 PM
4. ### Least Square Estimators

When we only have sample size of 2,can we still calculate the least squares estimators for alpha and beta? ?

• Replies: 3
• Views: 1,935
10-13-2011, 06:43 PM
5. ### Small question regarding linear mixed effect model

Thanks so much for reading my post. I've listed key points below. Hopefully once completing reading my problem will become clear. X is an...

• Replies: 0
• Views: 1,866
10-13-2011, 10:49 PM
6. ### Correlation Coefficient

Suppose X is transformed to cX, and Y is transformed to dY where c and d are constant, what happens to the correlation coefficient?? Is it...

• Replies: 0
• Views: 1,707
10-14-2011, 04:50 AM
7. ### Drawing polynomial out of regression results table of a fixed effects regression

Dear all, maby its a simple question but I could not find a compelling answer in books or papers: I run a fixed effects regression giving me a...

• Replies: 3
• Views: 2,818
10-15-2011, 04:06 PM
8. ### Bootstrapping confidence intervals for prediction based on SE of the coefficients?

Is it remotely legitimate to use the standard errors of the coefficients from linear regression in a Monte Carlo simulation to bootstrap 2.5%/97.5%...

• Replies: 0
• Views: 1,578
10-15-2011, 08:35 PM
9. ### How to run Multivariate regression model w/ lags in R

Hello everyone, great resource here! I have done some googling and searching of forums, but I cant seem to find how to run a regression like the...

• Replies: 1
• Views: 3,084
10-15-2011, 08:40 PM
10. ### Sum of Squares Model Proof

I'm attempting the proof of the sum of squares model. I'm not exactly sure where to start but this is what I have to prove. sumYhati^2 = nYbar^2...

• Replies: 1
• Views: 5,194
10-16-2011, 06:35 PM
11. ### Centered simple betas should be =?

I'm reading Aiken and West Multiple Regression: Testing and Interpenetrating Interactions (p. 33-34) Assume CENTERED means: X_i-\bar{X}_i They...

• Replies: 2
• Views: 2,329
10-18-2011, 08:09 PM
12. ### Asymmetric confidence bands in nonlinear regression

Hi, I would like to know the formula for asymmetric confidence bands in nonlinear regression. Figure 6 on this webpage is exactly what I'm looking...

• Replies: 0
• Views: 2,564
10-19-2011, 02:43 PM
13. ### 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: 22,132
10-20-2011, 01:33 AM
14. ### logistic regression question

Hi everyone, If you please advise me why in logitic regression if we have one dependent (binary) and 4 continuous variables, the r value is +ve...

• Replies: 2
• Views: 2,800
10-22-2011, 05:10 PM
15. ### Orthogonal projection onto linear span.

Hi there. I was hoping someone could give me a starting point on this problem because I'm clueless. given y = x1 =

• Replies: 3
• Views: 3,646
BGM
10-24-2011, 12:55 PM
16. ### Need Help - Valuing Coefficients

Hi guys (and gals), new to the forums. I work for a grocery store, and we're trying to determine the sales lift associated with a free sample...

• Replies: 2
• Views: 1,967
10-24-2011, 03:24 PM
17. ### What regression methods to study?

I am currently putting in a proposal for an independent study course in the summer in regression. Part of it is which regression methods and...

• Replies: 9
• Views: 2,553
10-24-2011, 03:49 PM
18. ### change in significance level (univariate vs multivariate)

I have 3 independent variables, X, Y and Z when I do univariate regression on each of them, the t-statistics are -4.7, 1.8 and 2.2, respectively....

• Replies: 4
• Views: 5,111
10-25-2011, 10:09 AM
19. ### t-test for categorical predictors in regression WRONG!?

hey people... so i am sitting in my theory of GLMs class... and the prof just said something i had never ever heard in my life... which is that, in...

• Replies: 9
• Views: 4,313
10-26-2011, 01:08 PM
20. ### Logit regression what does the output actually mean?

HI I have conducted a logistic model regression in MATLAB for a set of explanatory variables against a dependant variable. The explanatory variables...

• Replies: 1
• Views: 2,329
10-26-2011, 02:41 PM
21. ### Help on a project!!!

I am doing a school project and trying to find a relationship between government deficit/GDP (dependent variable) and inflation, interest rate,...

• Replies: 3
• Views: 1,968
10-26-2011, 05:51 PM
22. ### Excel mutliple regression

I have a made a double regression output in excel 2007 but I don't know how to explain those outputs. Can anyone tell me what does the Regression...

• Replies: 0
• Views: 1,585
10-27-2011, 07:28 AM
23. ### tandard errors of the parameter estimates in a quadratic fit

How do I estimate the standard errors of the parameter estimates in a quadratic fit? This page list the estimate for a linear fit:...

• Replies: 2
• Views: 4,014
10-27-2011, 08:06 AM
24. ### HELP with the concept of "percentile" (for regressions)

Hello everybody. This is my first post and I hope someone can help me with a problem I have. I am a complete begineer in statistics, I studied them...

• Replies: 2
• Views: 3,009
10-28-2011, 01:20 AM
25. ### Overall effect size measure for categorical variable

Dear forum, I am running logistic regressions with categorical predictors (nominal, several categories, dummy coded). I use a LRT to test...

• Replies: 0
• Views: 2,943
10-29-2011, 07:34 AM
26. ### Can I derive a standard error from a regression table, and do I need to???

I am not sure if this can be done, so I would appreciate any insight. I only have a regression table that has IVs with unstandardized and...

• Replies: 2
• Views: 1,581
10-29-2011, 07:38 AM
27. ### Sequence of Doing

Is it a good practice to estimate the least square estimators of alpha and beta first, then followed by a study of 2D-plot graph? Or better to do...

• Replies: 1
• Views: 1,501
10-29-2011, 07:42 AM
28. ### Autocorrelation/Regression

Post deleted

• Replies: 4
• Views: 3,029
10-29-2011, 09:58 AM
29. ### Dynamic Regression

Can we determine dominant factors using dynamic regression model?

• Replies: 0
• Views: 1,579
10-29-2011, 10:36 PM
30. ### Ridge Regression Estimators' properties...

Hi there I'm studying about Ridge Regression Estimator(RRE) and have a question. There are 3 properties of RRE. First, RRE can be derived by...

• Replies: 0
• Views: 3,336
10-30-2011, 11:36 AM
31. ### Joint hypothesis testing

Hi, I am working on a 'quick' study on whether ex-ante probabilities predict the actual realized outcomes of sporting events. My model is ...

• Replies: 4
• Views: 5,142
10-31-2011, 06:30 AM
32. ### 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: 4,647
10-31-2011, 08:10 AM
33. ### Interpretation of coefficient

Hello, I am trying to interpret the results of a coefficient in a log-linear specification. I am trying to investigate the relationship between...

• Replies: 0
• Views: 1,907
11-01-2011, 03:56 AM
34. ### GLM Interpretation - confused.com

Hi Folks, This may seem pretty straight forward to many of you but I'm could really do with some help. I'm using the generalized linear model to...

• Replies: 3
• Views: 3,122
11-01-2011, 09:46 AM
35. ### Cubic polynomial regression - Correlation coefficient

How to compute the Correlation Coefficient of third degree polynomial regression? Using R and Statgraphics I only get R2, wich I believe that is...

• Replies: 0
• Views: 3,973
11-01-2011, 05:56 PM
36. ### Is it possible to compare significance levels using a test?

Hi guys! I have got a question and was hoping some smart guy here could help me out; I ran two regressions: Yt = c + Xt + Xt-1 + Ct + Yt-1 Zt =...

• Replies: 0
• Views: 1,856
11-01-2011, 07:06 PM
37. ### Logistic regression

What does it mean when I have insignificant Wald test for all my predictor variables in the (Variables in the Equation) table, although the goodness...

• Replies: 13
• Views: 3,454
11-02-2011, 01:36 PM
38. ### Theoretical question from Mixed Effects Random Coefficents Multilevel Linear Models

hello people! this is kind of a theoretical question from people who've seen mixed-effects/random-coefficients/multi-level models before or have a...

• Replies: 6
• Views: 2,845
11-03-2011, 12:46 AM
39. ### ANCOVA and geography help

For a GIS class project, I'm doing some research based on Christopher Rumh's 2000 paper Are Recessions Good for your Health? In it, he analyzes...

• Replies: 1
• Views: 2,398
11-03-2011, 03:09 AM
40. ### Regression Interpratation

..........

• Replies: 1
• Views: 2,116
11-03-2011, 03:00 PM
41. ### Linear regression

Little help please: A golf club manufacturer is trying to determine how the price of a set of clubs affects the demand for clubs. Below contains...

• Replies: 1
• Views: 1,942
BGM
11-04-2011, 07:15 AM
42. ### Logistic Regression

For a transportation project analyzing the main effects, blocking effects of -Driving condition(3), message type(2) -AgeRange(3), gender(2) ...

• Replies: 2
• Views: 2,081
11-04-2011, 04:14 PM
43. ### Orthogonal projection in regression analysis.

Can someone explain what exactly you are trying to find when using orthogonal projection in regression analysis. I don't quite understand it. You are...

• Replies: 0
• Views: 1,796
c2q
11-04-2011, 10:29 PM
44. ### Interpretation of multiple linear regression model

I have a regression that includes three continuous and nine categorical independent variables. One of the categorical variables has 6 values while...

• Replies: 2
• Views: 2,383
11-07-2011, 07:19 AM
45. ### Uncertainty on covariate

Hi guys, I'm working on the links between road traffic noise and mental health using multilevel modelling (level 1 = individuals - level 2 =...

• Replies: 0
• Views: 1,501
11-07-2011, 09:09 AM
46. ### How do I test linearity of binomial data??

- deleted double post -

• Replies: 0
• Views: 1,880
11-07-2011, 12:53 PM
47. ### Interaction results

We have two diagnostic fields (a primary one for most important analysis and secondary one for less important one). Both fields have the same exact...

• Replies: 0
• Views: 1,949
11-07-2011, 03:48 PM
48. ### 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: 9,587
11-07-2011, 04:32 PM
49. ### Regression verses ANOVA models

Suppose you run both an ANOVA and a linear regression model on the same data using the same dependent variable and set of independent variables. The...

• Replies: 1
• Views: 2,576
11-07-2011, 08:03 PM
50. ### Combining variables in SPSS

I want to combine two variables that have the same level of measurement (5-point scale) in a third one to use it in my regression model, how can I do...

• Replies: 0
• Views: 3,024
11-08-2011, 09:02 AM
51. ### coefficient discrepancies

I am running a regression with 1 cont. ind. var and 1 cat. ind. var. There are 3 levels to the cat var so I have the lowest level set as the dummy...

• Replies: 2
• Views: 1,794
11-08-2011, 04:00 PM
52. ### same variable: Single regression not stats sig but multiple regression stats sig?

Evening, IMy statistical query is that I am conducting a multiple regression ( step down - ommitting the non significant variables one by one). I...

• Replies: 2
• Views: 3,968
11-09-2011, 04:44 AM
53. ### Sxx from ANOVA output?

Hi everyone, I have an upcoming test in Stats class. The professor has posted review questions but isn't responding to my questions. Below is a...

• Replies: 2
• Views: 9,115
11-10-2011, 12:52 PM
54. ### Multiple Regression Question

This is my data: Bars

• Replies: 8
• Views: 3,250
11-10-2011, 02:17 PM
55. ### Data Question

Ok I am trying to look at the relationship of sales

• Replies: 5
• Views: 1,974
11-10-2011, 04:02 PM
56. ### Simple Linear Regression- need help!

Ok I am trying to look at the relationship of sales

• Replies: 1
• Views: 1,638
11-10-2011, 07:47 PM
57. ### Help to control on the size effect between two groups (small vz. big)

Hello All, I would like to have your help to solve the size effect. Specifically, I have two group of companies listed on different markets....

• Replies: 6
• Views: 2,894
11-12-2011, 12:44 PM
58. ### Model building question-Is the researcher right?

I'm thinking about a researcher who made the following statement about a model(upon criticism of his interpretation of the data). "There is a...

• Replies: 7
• Views: 2,718
11-13-2011, 05:22 PM

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