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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### statistical robustness analysis in minitab

Hello! I was asked to comment on statistical robustness analysis in minitab, but honestly I don't know much about it. Can anyone help me...

• Replies: 0
• Views: 771
11-29-2015, 04:11 PM
2. ### Logit:why aren't my exponentiated coefficients equaling my odds ratio (for nominal x)

I'm running logit in JMP. My understanding is that if you exponentiate the coefficients, you get the change in odds ratios from a 1 unit change in X....

• Replies: 3
• Views: 1,056
11-28-2015, 10:18 PM
3. ### cross-validated AUC

Hello All, I hope the thread's title makes sense to you. I need to perform internal Cross-Validation using k-fold CV (needless to say, to assess how...

• Replies: 10
• Views: 1,379
11-27-2015, 03:32 PM
4. ### [Logistic regression: Stepwise] Why does the model keep a non-significant predictor?

Hello there, I'm running a logistic regression with four independent variables. I use the Stepwise: Backwards LR method for the regression. ...

• Replies: 2
• Views: 863
11-27-2015, 03:56 AM
5. ### Comparing AIC between OLS and Quantile regression

Hello all, Is it acceptable to compare the AIC of an OLS linear model to the AIC of a quantile linear model to see which is the better fit? I...

• Replies: 0
• Views: 568
11-26-2015, 12:10 PM
6. ### Variable Analysis

I'm new to using regression and was curious how most of you go about creating a tightly fit model. I've always tried to get all my variables under a...

• Replies: 1
• Views: 638
11-24-2015, 07:34 AM
7. ### ANCOVA - can I delete a very significant variable from a model's equation?

Hi all, I undertook a sensitivity analysis to study the contribution of explanatory variables to soil organic carbon variations. Here, the...

• Replies: 5
• Views: 833
11-24-2015, 07:30 AM
8. ### Multiple linear regression using moderators

Hi guys, first post here! First some background information: I am doing a study that examines whether patents and trademarks (2 independent...

• Replies: 0
• Views: 799
11-23-2015, 11:40 AM
9. ### Instrumental variable approach to a model with squared and interaction terms

• Replies: 0
• Views: 480
11-22-2015, 04:50 PM
10. ### Degree of Freedom in extra sum of squares

Give the degrees of freedom associated with a)SSR(X_1|X_2) b)SSR(X_2|X_1,X_3) c)SSR(X_1,X_2|X_3,X_4) d)SSR(X_1,X_2,X_3|X_4,X_5)

• Replies: 0
• Views: 665
11-21-2015, 12:29 PM
11. ### [Logistic Regression] - Is it possible to compare the outcomes?

Dear all, First time poster here. I'm currently working on my thesis and i'm stuck with a complex matter which i hope you guys can help me with. I...

• Replies: 1
• Views: 824
11-21-2015, 02:55 AM
12. ### Implement Young's Information Criterion in Matlab for analyzing recursive arx models

Hey For an assignment we want to implement the YIC instead of Aikake's information criterion because it's more suitable to fit our data. We have...

• Replies: 0
• Views: 861
11-20-2015, 04:24 AM
13. ### regression on age groups

Dear All, I have the following question: Estimate a simple regression model of ‘libertarian-authoritarian’ attitude as a function of age groups...

• Replies: 5
• Views: 2,498
11-17-2015, 06:37 PM
14. ### Will Cochrane-Orcutt process remedy heteroskedasticity? Using GRETL

I tried searching for this in the forums but cant seem to find anything. I'm probably just wording it wrong. I'm working on a research project for...

• Replies: 1
• Views: 592
11-17-2015, 05:44 AM
15. ### Model to use, fractions as independent and dependent variables

Hi, I have some background on doing regression analysis, however never on fractional variables. My question is related to model selection on...

• Replies: 1
• Views: 1,074
11-14-2015, 04:36 PM
16. ### Which R-Package / function is appropriate? fixed variance, random coefficients and AR

Hi, I have time-dependent data which show an inreasing variance with a certain covariate X (which can be modelled using a fixed cariance...

• Replies: 0
• Views: 608
11-14-2015, 03:20 AM
17. ### Regression with Differential equations (ODEs / PDEs)

Hi, in the field of mathematical modelling of biological or physical processes, most of them cannot be described by simple (linear or nonlinear)...

• Replies: 0
• Views: 571
11-12-2015, 07:18 AM
18. ### A coefficient to determine Variance

Hi I am working on a system where temperature stabilises with distance but also increases/ decreases based on month/ hour. Is there a way to...

• Replies: 1
• Views: 1,285
11-09-2015, 12:41 PM
19. ### Increasing variables decreases DFs?

I'm sorry if this is a total noob question, but I cannot figure it out. When I'm adding variables into my regression into STATA, the degrees of...

• Replies: 2
• Views: 797
11-08-2015, 09:46 AM
20. ### GEE: best model by comparing residuals (SPSS)

Hello there, I am doing a study on vigilance research by comparing different EEG methods (ERP, FFT and ERD) regarding their predictive power of...

• Replies: 0
• Views: 773
11-07-2015, 08:33 AM
21. ### regression analysis for research

hi there, working on a project in which we compare eye contrast among mammals at various points. We collected data (luminance value) for parts...

• Replies: 0
• Views: 662
11-06-2015, 08:20 PM
22. ### Can you help me identify the right test for my data?

I’m trying to identify the right statistical method to use. Here’s a case analogous to mine: Let’s say I’m interested in whether basketball team...

• Replies: 0
• Views: 658
11-06-2015, 06:19 PM
23. ### Adding main effects when main effects model is insignificant

Hi, I have a linear model where both main effects are insignificant, and an overall insignificant model. Should I stop just stop there, or can I...

• Replies: 1
• Views: 553
11-05-2015, 07:31 PM
24. ### Factor scores or mean values?

Dear all, I hope I am in the correct forum and you can help me. At the moment I pursue a survey study. In the survey I obtain items that shall...

• Replies: 0
• Views: 512
11-05-2015, 05:42 AM
25. ### Question related to Generalized Linear Mixed Model

I'm working with a dataset containing the following: Fixed variables: Age, Body Size, Antler Size, Average Age Random variable: Animal ID...

• Replies: 2
• Views: 766
11-04-2015, 10:55 PM
26. ### R Squared and dummy variables

Hey, If you changed your model from one variable to a number of dummy variables, would the R^2 increase considerably, supposing that the dummy...

• Replies: 5
• Views: 1,436
11-03-2015, 02:11 PM
27. ### Country-level Clustering

Hi All, I have a database on firms that went bankrupt/not bankrupt from 1999-2011 across 30+ countries. I have included year fixed effects in my...

• Replies: 1
• Views: 602
10-29-2015, 02:34 AM
28. ### Help with Hat Matrix

considering the model Yi=β0+β1Xi+ϵi, i=1,2,3,…,n how can i calculate the hat matrix and what would element hij be ? thanks

• Replies: 0
• Views: 729
10-28-2015, 07:39 PM
29. ### Partial Correlation question help

Hi, I was wondering if you could help me. I've been set the problem below. I know how to work out the Partial Correlation and I could do it for A1 or...

• Replies: 0
• Views: 614
10-28-2015, 03:45 PM
30. ### Interpreting a IV variable whose values have been changed

Hello all, I'd just like to get advice on the following: I've got a few independent variables which had values ranging from -2.5 to 2.5. I...

• Replies: 1
• Views: 632
10-27-2015, 01:32 PM
31. ### Interaction/moderation in probit/logit

Dear all, in my studies some (maybe trivial...?) questions on interaction/moderation in probit/logit regression came up. Imagine the following...

• Replies: 2
• Views: 1,118
10-26-2015, 12:49 PM
32. ### correlation in multi-level model

In a multi-livel model where level 1 is within-person and level 2 is between-person, can level 1 be a simple correlation between two within-person...

• Replies: 2
• Views: 670
10-23-2015, 01:40 PM
33. ### Testing the equality of the Residual Sum of Squares of two linear models

I have two models of a dependent variable: Y = a1 + b1X1 and Y = a2 + b2X2 The variances around the lines of least error are important...

• Replies: 2
• Views: 596
10-22-2015, 09:19 AM
34. ### Need help with parallel mediated quadratic regression

Dear friends, currently I am stuck with a problem I can't solve on my own - I hope some of you might have a bright idea :) I am looking for...

• Replies: 1
• Views: 664
10-22-2015, 06:18 AM
35. ### Redesigning a questionnaire (a bit long...)

A quick background: I am trying to evaluate a questionnaire used to asses patients. It is used around the world to establish whether a patients...

• Replies: 0
• Views: 500
10-19-2015, 04:59 AM
36. ### Durbin-Watson bound dU>2.0

Hello. I was wondering, how to interpret bounds of Durbin-Watson test (dU, dL) if dU is greater than 2.0. I know that it is an extreme case, but just...

• Replies: 0
• Views: 903
10-17-2015, 09:40 AM
37. ### regression for ordinal data?

Hi All, I am looking at data showing injury to intervertebral discs. Injuries are graded on a 4 point scale with 0 being no damage and 3 being...

• Replies: 3
• Views: 1,333
10-17-2015, 06:19 AM
38. ### Does the intercept p value matter?

Hi everyone, I work on a model with logistic regression as a result I have intercept value = 0.06 , with a p-value = 0.86. Does this model...

• Replies: 5
• Views: 1,088
10-17-2015, 04:20 AM
39. ### Multilevel model with crossed random effects - does this model make sense?

I have a complex design and haven't found similar examples online. I'd really appreciate any views on the way I modelled it. At a first stage, 19...

• Replies: 0
• Views: 576
10-16-2015, 05:44 PM
40. ### Durbin-Watson

Hi, Do I need to run a Durbin-Watson test if I am finding regressions for the number of second-language words learnt in a week based on age in...

• Replies: 2
• Views: 873
10-16-2015, 04:18 PM
41. ### SE of Reference category in Multinomial Logit Model

I used R to fit a Multinomial Logit model to my data. The data includes some categorical variables as effect coded variables. For example, one...

• Replies: 7
• Views: 1,067
10-15-2015, 09:55 AM
42. ### Comparing two factors in five areas

I recently compared two factors in five different areas testing diversity of one factor against another. (Diversity was made quantitative for...

• Replies: 0
• Views: 603
10-14-2015, 04:01 PM
43. ### GLM multivariate analysis with proportion & continuous data

Hi there, I am looking to perform some multivariate analysis on my data (such as canonical correlation analysis or multivariate multiple...

• Replies: 1
• Views: 1,918
10-11-2015, 04:11 PM
44. ### Physics Teacher with a question of appropriate use of regression equaitons

Is it ever acceptable to replace discrete measured values with a continuous function if you are certain you have the right model? For the last...

• Replies: 4
• Views: 1,218
10-11-2015, 01:56 PM
45. ### Testing a log transformed reg model with the non-log transformed

Hello, I was wondering how one test two regression models against each other. One being the log transformed of the other like this: y = var1 +...

• Replies: 6
• Views: 1,105
10-10-2015, 02:40 PM
46. ### Time Series Analysis with Triple exponential smoothing

What would be the best formula to forecast a weeks worth of daily data?

• Replies: 3
• Views: 821
10-07-2015, 04:05 PM
47. ### AIC backward selection - control variables

Hej! I have a question concerning AIC backwards selection. I am doing a Linear Mixed effect model where I have one main predictor and several...

• Replies: 2
• Views: 769
10-06-2015, 12:26 PM
48. ### scatter plot for partial regression (in spss)

Hi all I have an SPSS regression model in which I have a dependent variable, an independent variable and 4 covariates. I want to create a...

• Replies: 0
• Views: 738
10-06-2015, 10:46 AM
49. ### Leave one out cross validation

Hi everybody, I've done a linear regression analysis with forward selection method. my number of observations are 32 and the final model selected 2...

• Replies: 3
• Views: 1,507
10-06-2015, 01:09 AM
50. ### Problem with Greene Econometric Analysis 7th Edition demand example page 110

Strange question, I know, but I am unable to reproduce the results shown when he adds a lagged dependent variable to his gasoline demand function....

• Replies: 0
• Views: 782
Rod
10-04-2015, 09:53 PM
51. ### Automatically finding relationships between 3 or more variables

Hello, Total newbie here - but I'm hoping someone can help me out. I have finished running a multiple regression analysis and have my results....

• Replies: 0
• Views: 546
Tzo
10-02-2015, 07:37 PM

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