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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### How to model large multivariate dataset

I have a years worth of data at a manufacturing plant with 20 predictor variables and 8 response variables that I'm interested in. A number of the...

• Replies: 2
• Views: 1,375
11-07-2013, 12:46 PM
2. ### regression analysis to measure TV advertising effectiveness

Hi, I am running a TV advertising analysis where I want to measure if having a 5 day advertising campaign or 7 day advertising campaign would be...

• Replies: 1
• Views: 2,067
11-07-2013, 08:40 AM
3. ### Multiple Linear Regression and likelihood Ratio Test

Hi All, I have completed multiple regressions with one model including an interaction term, and the other not including the interaction term. ...

• Replies: 4
• Views: 5,648
11-06-2013, 09:22 PM
4. ### Help me interperet this output with non significance. :)

I have completed analysis on the effects of two drug treatments over a period of time on the CD4 cell count of a number of patients. I have taken the...

• Replies: 1
• Views: 1,224
11-06-2013, 02:47 PM
5. ### Comparing negative binomial model to the null model with offsets

Hi there, I have a negative binomial model of count data with an offset (total counting effort) in R: ...

• Replies: 0
• Views: 1,936
11-05-2013, 02:38 PM
6. ### [ self-selection - nonresponse bias] 65% of population answered survey

Dear TalkStatstters, I want to investigate possible wage gaps between different groups of people with doctorate degree, in my region. So, I have...

• Replies: 3
• Views: 2,416
11-05-2013, 08:25 AM
7. ### how to assess the influence of these two variables on this score?

Hello, this is my case: I have the follow variables: clinical condition: yes/no, smoke: yes/no: test score; continuos variable, in my case it gos...

• Replies: 3
• Views: 2,036
11-04-2013, 08:00 AM
8. ### Spunky's idea of Weighted Least Squares

hey! sorry for the late post. i didn't end up coming back yesterday until late at night (as usual, lol) but i really wish to clarify whatever...

• Replies: 13
• Views: 2,850
11-01-2013, 11:37 AM
9. ### A regression problem with optional treatment

I have an interesting problem here and really need your suggestion to analyze the data in a proper way. In 2012 we collected data about retention...

• Replies: 0
• Views: 1,431
11-01-2013, 03:48 AM
10. ### Aggregating or Pooling Multinomial Logistic Regression Coefficients

I'm trying to recreate the MNL analysis like this paper or this one. In Excel I have a sheet with my choice column which contains the market share...

• Replies: 1
• Views: 1,628
10-31-2013, 05:35 PM
11. ### Difference-in-difference testing

Hi folks -- Never posted to this forum before, so forgive me if I make an error or three. I'm trying to conceive of how to do significance...

• Replies: 0
• Views: 2,058
10-31-2013, 04:49 PM
12. ### Ordinal Regression: Parallel Lines Test

Hi All, I'm analyzing survey results with many responses coming in the form of Likert scales. In this case, I actually have two Likert scale...

• Replies: 5
• Views: 8,286
10-31-2013, 12:56 PM
13. ### cumulative odds ratios - additive or exponential?

I have run some regression models that examine the effect of variable X (a 15 point continuous scale) on Y (a binary variable - didn't perform/did...

• Replies: 3
• Views: 3,215
10-31-2013, 11:49 AM
14. ### 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
15. ### stronger beta in multivariate than in univariate regression?

Hi, I have a problem interpretig univariate vs multivariate regression. I have a dependent variable and want to analyze what factors independently...

• Replies: 1
• Views: 4,512
10-31-2013, 08:04 AM
16. ### substitutes/complements

Hi! I have a problem to conclude if variables are substitutes or complements. In regression, varible A has positive effect, variable B has negative...

• Replies: 0
• Views: 1,801
10-31-2013, 04:41 AM
17. ### Variables in Stock Trading System

Hey guys I have designed an application to allow me to test certain variables in a stock trading system, i.e. to determine which variables cause the...

• Replies: 0
• Views: 1,788
10-30-2013, 10:13 PM
18. ### Dummy coding in linear regression, with an interaction

I am using linear regression with a categorial variable (3 levels of stress manipulation) and continuous variables. I am unsure how to dummy code my...

• Replies: 1
• Views: 4,179
10-30-2013, 09:29 PM
19. ### calculating adjusted rsquared by hand

Hi. I just wanted to make sure I am doing these calculations correctly. I have 8 models, one with no variables. So to get the adjusted rsquared, I...

• Replies: 1
• Views: 8,157
10-30-2013, 11:59 AM
20. ### Ordered Probit Diagnostics.

Hello everyone, I'm dealing wth an ordered probit model, I need now to test the different specifications of my model, but I've not clear ideas on...

• Replies: 0
• Views: 3,029
10-30-2013, 11:48 AM
21. ### Multiple Regression - Variable variation and Beta estimation

Dear all, First thing first, thank you for looking at this post. I have looked on the website but could not find at I am after. Regression...

• Replies: 0
• Views: 1,214
10-29-2013, 06:32 PM
22. ### Introduction of Heteroscedasticity with additional variable

Hi everyone, I am running an analysis in which I am also checking for heteroscedasticity of my data. The tests tell me that I have...

• Replies: 3
• Views: 1,545
10-29-2013, 08:19 AM
23. ### Common method bias linear regression

I have an article for resubmission where the reviewer writes: "For example, you could test a CFA model in which you add an orthogonal method...

• Replies: 2
• Views: 2,367
10-28-2013, 07:03 AM
24. ### Logistic regression with interactions

Hi, I've asked this question already on another forum, but nobody has been able to answer, so I try it here. Because of my inexperience with...

• Replies: 2
• Views: 1,639
10-27-2013, 02:35 PM
25. ### Collinearity in multivariate regression trees.

Hi, I m new here and I am looking for help with my analysis. I have performed a multivariate regression tree using 8 variables as response and 10...

• Replies: 0
• Views: 2,262
10-24-2013, 10:42 AM
26. ### Logit model fails - collinearity between categoricals. How to fix?

Hello all! I have a logistic regression model where I'm trying to determine the effects of two categorical variables. However, one of the...

• Replies: 0
• Views: 1,408
10-23-2013, 05:39 PM
27. ### Interaction Terms: Logistic Regression

Dear forum, trying again... I would really like some advice on the proper construction and interpretation of a small experiment and analysis...

• Replies: 7
• Views: 3,100
10-23-2013, 05:33 PM
28. ### Adjust for which confounders

Hello! I have done a logistic regression to compare pregnancy rates amongst various ordinal categories of a specific blood hormone measurement....

• Replies: 4
• Views: 2,582
10-23-2013, 10:58 AM
29. ### no observations r(2000)

Hi All, I ran the code below and it returned an error saying "no observations". Does anyone know what this means? I do not have a great number of...

• Replies: 0
• Views: 1,114
10-23-2013, 10:18 AM
30. ### Logistic regression probabilities

Hi I have built a logistic regression model that predicts the response probability from a marketing campaign. The model ranks correctly (i.e. the...

• Replies: 4
• Views: 1,586
10-23-2013, 07:57 AM
31. ### How to interpret Multiple Linear Regression Output from SPSS

Hi All, I have completed a multiple linear regression in SPSS and I need a bit of help interpreting the results. dependent variable-score of...

• Replies: 0
• Views: 2,069
10-23-2013, 01:43 AM
32. ### 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: 4,995
10-22-2013, 12:33 PM
33. ### Multiple Linear Regression with categorical interaction?

HI All, I'm not sure if what I am doing is correct. I have a continuous exposure variable, a continuous outcome variable and another variable...

• Replies: 2
• Views: 2,077
10-22-2013, 08:51 AM
34. ### Regressions questions

Hi guys. I tried this questions for my quiz last night and did really badly. I am not sure about the answers. I got 0.672, 1.771(I'm not sure about...

• Replies: 2
• Views: 1,844
10-21-2013, 06:57 PM
35. ### 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: 6,908
10-21-2013, 08:11 AM
36. ### Correlation between four parameters

Dear memebers, I need to make correlation between four parameters; how can I do it and by which outil it's possible? Can someone please tell me...

• Replies: 1
• Views: 2,136
10-20-2013, 12:32 PM

I am checking assumptions and outliers before running moderated regression analysis. I wonder if I should check normality, linearity, and equal...

• Replies: 3
• Views: 3,491
10-19-2013, 05:21 PM
38. ### Issues with cutoff value and interpretation of Exp (B)

Hello again :). Coming back with my log.regression analysis's issues, which i have 2 for the moment. 1. When i run log.regression i need to...

• Replies: 0
• Views: 1,476
10-17-2013, 01:46 AM
39. ### Large part of population sampled with logistic regression

Hi all, Back from a hiatus with a question. I'm doing an analysis on survey data on commuting to work. We're interested in the factors that...

• Replies: 4
• Views: 1,413
10-16-2013, 09:20 PM
40. ### Combining several regression

Sorry for this simple, maybe idiotically so, question :) I'm trying to make a very basic model for basketball, though the sport doesn't really...

• Replies: 1
• Views: 1,409
10-14-2013, 11:24 AM
41. ### logistic regression predicted values and confidence interval

Hello I have run a logistic regression with two independent variables. I have used transformed my y(sales) and my x1(population) and x2(water). I...

• Replies: 0
• Views: 1,577
10-13-2013, 03:19 AM
42. ### Interpretaing the coefficients of polynomial regression and multiple regression.

How do i interpret the coefficients of the 2nd degree polynomial regression model: (crop yield)=1.22+2.1(Nitrogen doses)+3.1(Nitrogen doses)^2 ...

• Replies: 4
• Views: 1,416
10-12-2013, 08:00 AM

hello, I have started my first journey to logistic regression, and i have already got my first problem. so, my SPSS merged file contains: -...

• Replies: 8
• Views: 1,379
10-11-2013, 04:51 PM
44. ### Non normal residuals

Hi everyone. Im rookie in this forum and also in regression analysis so i hope there I will be able find the help :) I created OLS multivariable...

• Replies: 3
• Views: 1,924
10-11-2013, 09:00 AM
45. ### Want to plot line to subgroups for relation between one of the IV and the DV

Hi all, I will try to explain my case as detailed as I'm able to... I have measured on 11 plant species. I want to know the determinants of...

• Replies: 0
• Views: 952
10-11-2013, 06:27 AM
46. ### Can logistic regression give opposite results than univariate analyses?

Dear anyone I am studying the risk for taking drug X. My study population includes >500 people. I have a list of variables (gender, age…)...

• Replies: 4
• Views: 2,732
10-11-2013, 03:25 AM
47. ### Interpreting log-linear model

I am having some difficulties interpreting my regression results. I have a log-linear model. My dependent variable is a “time spent with children”...

• Replies: 1
• Views: 1,731
10-11-2013, 01:47 AM
48. ### Stationarity in regression

This is much a time series question as a regression one, but I work a lot with regression using time series data these days. I am running regression...

• Replies: 4
• Views: 3,800
10-10-2013, 12:09 PM
49. ### Regression involving likert scale response

Hi, I am trying to carry out regression analysis. I would like my dependent variable to be a Yes/No type, and my independent variables to be...

• Replies: 8
• Views: 2,946
10-09-2013, 08:57 PM
50. ### Logistic Regression with unequal proportions

Hello With the help of this forum I'm getting my head around logistic regression. My data contains a survived/died response and within the...

• Replies: 7
• Views: 2,340
10-09-2013, 03:06 PM
51. ### Saving regression coefficients in a loop and drawing a histogram

hey i need help with the following task i have to do for university: I have a data set and should in a first step produce a random sample with 100...

• Replies: 2
• Views: 1,341
10-09-2013, 07:58 AM
52. ### Robust standard errors.

When your model has heteroskedasticity, is it "enough" to specify your model to have robust se? With a large number of obs.

• Replies: 3
• Views: 2,089
10-08-2013, 09:02 PM
53. ### comparing regression coefficients among many groups

Hi all, first of all, sorry for my poor English since I'm not native English speaker, I have this simple OLS regression equation model with one...

• Replies: 2
• Views: 2,135
10-08-2013, 06:05 AM
54. ### How do you intrepret coefficients in logistic regression?

I am studying whether opinion polls predict presidential elections in one course project. The data I have is of following kind. I have a binary...

• Replies: 3
• Views: 2,471
10-08-2013, 04:35 AM
55. ### Does the standard error of the regression not need to be corrected by n?

The standard error of an estimator is defined as the square root of the the estimator variance (or mean squared error (MSE) for unbiased estimators)....

• Replies: 2
• Views: 1,122
10-07-2013, 01:49 PM
56. ### unstandardised coeffcients value over 1.0?

Hello all First post from somebody who uses stats for work but not a statistician Dumb question perhaps, but if my multiple regression...

• Replies: 4
• Views: 1,471
10-07-2013, 10:55 AM

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