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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Can we really(theoretically) generalize fixed regressor linear regression?

If we have stochastic regressors, we are drawing random pairs $(y_i,\vec{x}_i)$ for a bunch of $i$, the so-called random sample, from a fixed but...

• Replies: 3
• Views: 437
05-30-2016, 10:16 PM
2. ### Time-varying covariates in linear mixed models/multilevel models

Hi! I am a Norwegian phd student exploring the effects of nocturnal road traffic noise exposure in children. One of the research questions is...

• Replies: 0
• Views: 416
05-30-2016, 05:49 PM
3. ### Mediation analysis - an issue of two opposing (contrary) effects

Hey! I would be very grateful about any advices or comments on an issue I have recently come across. We tested a simple mediation analysis,...

• Replies: 0
• Views: 216
05-30-2016, 03:52 PM
4. ### out of sample

Hi There I have 2500 data with 2 sample. one index and another stock. i've done goodness of fit and regression analysis on it.now I've been asked to...

• Replies: 3
• Views: 336
05-30-2016, 08:05 AM
5. ### Why do you subtract the mean of a predictor variable from that variable..

An author using temperature as a predictor subtracted its mean value from each temperature data point to deal with "scaling issues." I don't...

• Replies: 5
• Views: 465
05-29-2016, 12:33 PM
6. ### Violation of linearity assumptions - binary logistic regression - what to do?

I am running a binary logistic regression with SPSS and unfortunately the assumption of linearity (Box-Tidwell procedure) are not met for the...

• Replies: 10
• Views: 752
05-26-2016, 02:46 PM
7. ### Relative impact of variables on DV

I keep circling back to this issue, this time with a twist. I am arguing with some sports statisticians (who use statistics very differently than the...

• Replies: 1
• Views: 257
05-26-2016, 02:18 PM
8. ### Multiple linear regression: square root transformation of predictor variable

I have used a square root transformation to successfully correct the positive skew of a predictor variable in a hierarchical multiple linear...

• Replies: 0
• Views: 308
05-25-2016, 04:38 PM
9. ### Individual vs. Team Aggregated Data

I have a set individuals (let's say ID_No 1 through 50) and a set of metrics that pertain to these individuals: things like age, SAT reading score,...

• Replies: 0
• Views: 237
05-25-2016, 01:19 PM
10. ### how to argue using wald-test/LR-test for logistic Regression

Hey there, I'm writing my thesis and I did a logistic regression in a data set. At first, it didn't come into my mind that I should argue why I'm...

• Replies: 0
• Views: 221
05-25-2016, 08:38 AM
11. ### OLS regression with interdependence

Hello everyone, I have been writing my thesis and decided, together with my supervisor, to use OLS even though my actors are interdependent...

• Replies: 0
• Views: 188
05-25-2016, 07:15 AM
12. ### R help with Binary log reg

Apologies -- should have posted my question in the R forum instead

• Replies: 0
• Views: 267
05-22-2016, 02:24 PM
13. ### Chi-square instead of Multiple Regression Analysis

Can someone help me? How can I explain that I used Chi-square test of association instead of Multiple Linear Regression Analysis because I had...

• Replies: 0
• Views: 268
05-21-2016, 12:42 PM
14. ### Interpretation of a lagged dependent variable, coefficient as proportion- Panel data

Dear experts! I am having some difficulties in interpreting the results of my regression model using Blundell–Bond linear dynamic panel-data...

• Replies: 0
• Views: 291
05-20-2016, 01:41 PM
15. ### Alcoolimetric Table

Any idea for estrapolation data for this table? I have read spec gravity= 0.8013 what will the content of Alcool? ...

• Replies: 0
• Views: 239
05-20-2016, 10:10 AM
16. ### Logistic Regression interpretation help

Hello I'm working on a project and had some debates with my colleagues on logistic regression model. Hope someone here can clarify for us. Let's...

• Replies: 0
• Views: 318
05-18-2016, 02:14 PM
17. ### Repeated measures, random effects, or both?

Hi, I have the following situation and I do not know if it is a case that calls for repeated measures or individual-specific random effects. We...

• Replies: 6
• Views: 503
agp
05-18-2016, 09:08 AM
18. ### Field's test for linearity of the logit

Hello, I am currently working on my bachelor thesis and I ran a logistic regression on a data set I have. From Field's 'Discovery Statistics...

• Replies: 0
• Views: 515
05-17-2016, 08:19 AM
19. ### SPSS - Regression - interpretation and generalizing results

Hello, Im really grateful you have taken the time to read my post. Thanks for your help. Im doing a regression analysis trying to predict...

• Replies: 2
• Views: 455
05-16-2016, 09:36 AM
20. ### dummy regression - unequal sample sizes

Hello, I am conducting a linear regression analysis in SPSS with different variables: - scale, - 2-level nominal, - 5-level nominal (dummy)...

• Replies: 0
• Views: 270
05-15-2016, 10:50 AM
21. ### Time series

Say you know that you have autocorrelation in your data. Say AR =2. Can you use ARIMA to remove the AC, then predict the results of the ARIMA with...

• Replies: 1
• Views: 342
05-15-2016, 09:58 AM
22. ### Two way repeated measures with zeros, non integer values, and non-normal distribution

I would really appreciate some help with a few models I am trying to run. Essentially my data looks at how often a subject was visited depending on...

• Replies: 1
• Views: 304
05-12-2016, 02:48 PM
23. ### coding - one categorical vs multiple dummy

Hi, Most things I read seem to suggest that when you have a categorical predictor in a regression analysis you should create k-1 dummy variables,...

• Replies: 2
• Views: 360
05-10-2016, 04:57 PM
24. ### Interaction concept put into plain English

Hello, as you may know, I am not a statistician, rather a 'consumer' of statistics. When I study something new, or when I present statistics to a...

• Replies: 2
• Views: 336
05-10-2016, 08:42 AM
25. ### Model fit statistic for population-average specification

Hello everybody! For the purpose of my study I am using an exponential Poisson model with population-averaged (PA) effects, as implemented in...

• Replies: 0
• Views: 218
05-09-2016, 10:44 AM
26. ### Using Bonferonni in Multiple Regression

Hi all, I'm currently working on a data-set involving several continuous independent variables and i'm wondering how the Bonferonni correction can...

• Replies: 1
• Views: 263
05-09-2016, 06:37 AM
27. ### Multiple regression analysis - Linearity/homoscedasticity

Hello, I am currently having trouble determining if my predictors show enough linearity to be used in a standard multiple regression analysis, and...

• Replies: 2
• Views: 307
05-08-2016, 09:21 PM
28. ### Help for simple regression

My research question is: "Can we say that the number of hours of Internet use increases with Internet purchase?" with the variables: - Use of...

• Replies: 3
• Views: 451
05-08-2016, 07:34 PM
29. ### Imputing Missing Values using Regression

I have a table of 4 variables where some of the data is missing and I need to impute the missing values, my table is as follows: X1 X2 X3...

• Replies: 3
• Views: 354
05-06-2016, 06:21 PM
30. ### Significant two-way interaction, but simple slopes are n.s.

Hi everyone, I've seen similar questions like mine posted here before, but none of the replies were ever clear enough, so here's my Q. Thanks in...

• Replies: 1
• Views: 315
05-06-2016, 01:10 PM
31. ### How to select the Independent Variables for modelling given 100 variable??

Let's say i have selected my DV and i have 100 variables from which i have to choose my IDVs for the regression model(say multiple regression). ...

• Replies: 0
• Views: 280
05-06-2016, 05:19 AM
32. ### Multiparameter fittting - confidence intervals criterion

I made a multiparameter fittting (7 adjustment parameters, 45 experimental points). I obtained enormous confidence intervals for 95%. There is a...

• Replies: 0
• Views: 316
05-06-2016, 12:12 AM
33. ### Please anyone help due monday

Hey guys, Im doing a mathematics degree and have this stats subject and honestly have no clue whatsoever on how to do anything in this class. I have...

• Replies: 2
• Views: 300
05-05-2016, 03:23 PM
34. ### normality assumption: data itself, or residuals ?

I have a question about the normality assumption, in regression, ANOVA, and T-test: The normalization assumption is for the original data and...

• Replies: 3
• Views: 1,589
05-05-2016, 12:21 AM
35. ### Stepwise Regression Limitations Explanation

I've recently been working on building a model and have come across a number of different approaches. I'm particularly interested in the limitations...

• Replies: 12
• Views: 655
05-04-2016, 07:39 PM
36. ### Do I have a non-linear regression?

Hello everyone, I want to start by saying that I don't have too much experience working with continuous dependent variables. I have worked more...

• Replies: 5
• Views: 755
05-04-2016, 03:19 AM
37. ### Quick Mediation Analysis Question

Hi Everyone, I have a quick question about interpreting a mediation analysis from Hayes' PROCESS macro. After running a mediation analysis, I...

• Replies: 2
• Views: 711
05-04-2016, 03:01 AM
38. ### Index & Dummies - Italian Mafia

Hey. i am working on a paper about the mafia in italy. my equation: Y=beta0 + beta1*MPI + beta2*Controls Y = Response Rate in a given city...

• Replies: 0
• Views: 248
05-03-2016, 02:11 PM
39. ### Interpreting Odds Ratio after Weight of evidence transformation

I am doing a logistic modeling with several continuous variables and binary outcome variable. 1- event 0-non event. I did the initial modeling with...

• Replies: 2
• Views: 279
05-03-2016, 11:16 AM
40. ### Combining Two Samples (one w/ intervention and one w/ out intervention)

I have a local dataset with a continuous predictor and binary outcome. I will use logistic regression to predict the binary outcome with the...

• Replies: 7
• Views: 460
05-02-2016, 11:01 PM
41. ### testing seemingly unrelated regressions assumptions in R

Hi there! I have a fitted SUR model and want to test if the assumptions for SUR (not the ordinary linear assumptions, since i've already checke...

• Replies: 1
• Views: 321
05-02-2016, 03:54 PM
42. ### Cox Regression - time dependent

Dear all, I have a question regarding the cox regression. I have conducted a dataset with Top50 Boxoffice Data for the U.S market. It contains...

• Replies: 3
• Views: 357
05-02-2016, 10:45 AM
43. ### Types of regression: Article

Well a page, but I was not sure what to call this :p By no means complete or even close but interesting. There are hundreds of types of...

• Replies: 0
• Views: 250
05-02-2016, 09:49 AM
44. ### Fill in multiple missing values given correlation matrix

I have a correlation matrix: mat <- round(cor(mtcars), 2) mpg cyl disp hp drat wt qsec vs am gear carb mpg 1.00...

• Replies: 16
• Views: 900
05-01-2016, 10:39 PM
45. ### Linear Regression Interpretation

Hi there, I am running a Multiple Linear Regression analysis. I have 2 predictor variables (self-worth and self-acceptance) and 1 criterion...

• Replies: 4
• Views: 394
05-01-2016, 09:38 PM
46. ### Multinomial logit / time-series fixed effects / multivariate regression: Which one?

As part of a larger study, we have collected a wealth of data on the interactions customers engage in when buying and using a service. ...

• Replies: 0
• Views: 276
05-01-2016, 06:50 AM
47. ### Logistic reg w/ ratio as predictor

Is there anything I need to know when using a ratio as an independent variable in the model. Is it better to use log(ratio) ? Not an easy web...

• Replies: 1
• Views: 331
04-30-2016, 03:22 PM
48. ### [Logistic Analysis] How does SPSS calculate the 0.5 Cut-Point?

I am interested in determining the classification accuracy of an outcome (binary DV - whether a participant has capacity or not to make a legal...

• Replies: 0
• Views: 303
04-29-2016, 06:25 PM
49. ### Multivariate analysis, canonical correlation

Hello, I conducted an experiment with 18 subjects who participated in a simulator experiment. Each participant had to perform a task with 6...

• Replies: 0
• Views: 360
04-28-2016, 10:08 AM
50. ### Interpretation of coefficients, dependent variable in (%), independent variable in ln

Hi, I have a very simple question. I have the following equation. My dependent variable is CRES which is the share of renewables in a country's...

• Replies: 0
• Views: 283
Rex
04-28-2016, 08:07 AM
51. ### Problem with replicating a paper

I'm having some trouble at replicating this paper (text here: http://www.michiganjb.org/issues/52/text52c.pdf) The paper wants to assess the economic...

• Replies: 0
• Views: 229
04-28-2016, 05:29 AM
52. ### Writing down firth logistic regression equation

Hi, This is a really simple question that I'm sort of embarrassed I can't answer - how would you write down a firth logistic regression? Now to...

• Replies: 6
• Views: 404
04-27-2016, 01:59 PM
53. ### GLS (Generalized least Squares) STATA

generalized least squares (GLS) is a technique for estimating the unknown parameters in a linear regression model. GLS (Generalized least Squares)...

• Replies: 0
• Views: 253
04-27-2016, 06:16 AM
54. ### Regression with stratified data: What to do?

Hi, I want to model a bird population in a country via regression analysis (Poisson regression due to count data). In order to optimize the...

• Replies: 0
• Views: 231
04-27-2016, 04:39 AM
55. ### Minimum number of cases for the reference level

Before I ask this I have the true population so I am not sure this issue even applies :p Is there a minimum number of cases the reference level...

• Replies: 7
• Views: 474
04-26-2016, 04:59 PM

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