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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Variable transformation in OLS regression

Hi there, I have a question related to the transformation of independent variables in an OLS regression. More specifically: When I transform...

• Replies: 7
• Views: 4,598
06-20-2016, 06:48 PM
2. ### AUC below 0.5

Hi, I am calculating area under the curve (AUC) values for the individual independent variables of a conditional logistic regression model. I am...

• Replies: 3
• Views: 1,765
06-20-2016, 12:23 PM
3. ### Effective DoF with lag1 autocorrelated data...how to actually incorporate ?

Hi all, I have some time series data that is auto-correlated, and I am trying to account for in my correlation analysis. I have found out how to...

• Replies: 2
• Views: 1,089
06-20-2016, 02:41 AM
4. ### Can someone help me interpret this data?

I'm performing multiple regression for an international relations thesis regarding various predictor variables and the outcome of intervention in...

• Replies: 5
• Views: 1,231
06-19-2016, 06:58 PM
5. ### Pooled GLS and POLS

Hello everyone, This semester I'm studying, OLS, GLS, RE, FE, MLE, and a lot of beautiful concepts :D. But I get a little bit concerning the...

• Replies: 0
• Views: 1,659
06-18-2016, 07:57 AM
6. ### Two categorical variables, one continuous dependent variable

Hi, I want to check whether linear regression is the statistical tool I need and ways of checking whether my data is appropriate for this...

• Replies: 3
• Views: 1,679
06-17-2016, 12:23 PM
7. ### CI for Dependent Variable in Multiple Linear Regression

I have a regression model but I want to get a 95% confidence interval of the dependent variable for given values of the independent variables. I...

• Replies: 1
• Views: 934
06-17-2016, 11:58 AM
8. ### Regression Analysis from R output

• Replies: 0
• Views: 1,169
06-17-2016, 09:50 AM
9. ### interaction continuous*dummy:possible to treat continuous variable as the moderator?

Hey everyone. This is my first post here so please be kind to me :) . For my thesis my aim is to run a moderation analysis between organizational...

• Replies: 1
• Views: 890
06-17-2016, 04:42 AM
10. ### Consolidation of items for regression analysis

Hello everyone! I am a stats newbie and have a very basic question. Please forgive me if the question may seem too foolish. I wanted to conduct...

• Replies: 1
• Views: 1,418
06-16-2016, 09:12 PM
11. ### General guidance on interpreting residuals and diagnostics for linear regressions

Now that I'm more comfortable with regression (in SAS) and understand the assumptions needed for linear regression, I'm able to run simple models of...

• Replies: 5
• Views: 2,167
06-14-2016, 07:18 AM
12. ### Multiple Regression Analysis - Two independent variables, one w/same values

Post closed.

• Replies: 4
• Views: 1,636
06-13-2016, 09:23 AM
13. ### Causal mediation analysis with lagged endogeneous regressors

Hello dear forum members! So, in the study I am currently working on, I have the following (simplified) Poisson panel model with fixed-effects...

• Replies: 1
• Views: 1,041
06-12-2016, 11:56 PM
14. ### Interpret Transformed Independent Variables

Dear Forum, I ran a logistic regression and one of my Independent variables was transformed with a LG10. I know from normal non transformed...

• Replies: 1
• Views: 784
06-12-2016, 12:15 PM
15. ### My First Model

Hello, I am doing a Master's and I am at the dissertation stage, and have to write and test a model empirically. However I am not sure about...

• Replies: 1
• Views: 1,115
06-11-2016, 01:44 PM
16. ### Orthogonal-polynomial contrasts

Hi there, During my studies, I always learned that, when you have an independent ordinal variable, you could include it into your regression...

• Replies: 0
• Views: 953
Tux
06-09-2016, 04:56 PM
17. ### Detecting and adjusting for heteroskedasticity in ordinal logistic models

Does anyone know how to check whether heteroskedasticity is present in an ordinal logistic regression analysis? And, if present, how can it be...

• Replies: 0
• Views: 1,127
06-09-2016, 03:13 AM
18. ### Confidence intervals comparison for linear and quadratic slopes?

Hello, I am using regression analyses to evaluate changes in several different cognitive functions across the life span. In most cases, the...

• Replies: 0
• Views: 961
06-08-2016, 09:09 PM
19. ### Logistic Regression with interactions and contrasts

Hello All, I need some advice for choosing the correct model. I have 3 binary variables: Risk (0 = the person doesn't take financial risks, 1 =...

• Replies: 5
• Views: 2,089
06-08-2016, 09:37 AM
20. ### SQReg demonstration

Hello everyone, i need help with this demonstration: SQReg = B1^2*Sxx Someone can help?

• Replies: 1
• Views: 1,691
06-06-2016, 12:22 PM
21. ### Constant in linear regression

Hey guys, Need help in Linear regression: I have a dataset of 70 tumors that during resection we used an electric measurement to estimate a...

• Replies: 0
• Views: 2,094
06-05-2016, 10:47 PM
22. ### Interpretation of continuous interaction term

Hi all, I have a question regarding the interpretation of a squared interaction term in the following model: Y=β0+β1X+ β1X^2 + β2Z+ β3 X^2Z ...

• Replies: 0
• Views: 1,856
06-05-2016, 08:13 AM
23. ### Need help to choose right statistical analysis

Dear all, I have one dependent variable (Y) and 3 independent variables (X1, X2, X3). All dependent and independent variables are continuous. ...

• Replies: 0
• Views: 1,182
06-05-2016, 03:30 AM
24. ### Interpreting dummy variables.

I did not create the following variables, the state I worked for did...They have one variable coded W if you are white 0 otherwise. A second variable...

• Replies: 0
• Views: 1,348
06-04-2016, 05:59 PM
25. ### Beta weights and correlations

Dear all, I have used regression to explain a dependent variable with a number of independent variables. I expected independent variables which...

• Replies: 0
• Views: 924
06-04-2016, 04:05 AM
26. ### How to handle poor reporting unstandardised\standardized coefficients?

Hi, I have several times problem how to distinguish what is reported in clinical journals in relation to regression analysis. Frequently authors...

• Replies: 1
• Views: 1,010
06-01-2016, 05:56 PM
27. ### Is this Multicollinearity?

Hi guys, im relatively new in this forum. I have a question, i am using multiple regression analysis for my thesis. The result shows the P-value is...

• Replies: 8
• Views: 1,290
06-01-2016, 07:44 AM
28. ### 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: 1,849
05-30-2016, 09:16 PM
29. ### 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: 2,787
05-30-2016, 04:49 PM
30. ### 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: 1,431
05-30-2016, 02:52 PM
31. ### 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: 1,128
05-30-2016, 07:05 AM
32. ### 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: 1,639
05-29-2016, 11:33 AM
33. ### 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: 2,654
05-26-2016, 01:46 PM
34. ### 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: 1,216
05-26-2016, 01:18 PM
35. ### 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: 1,923
05-25-2016, 03:38 PM
36. ### 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: 822
05-25-2016, 12:19 PM
37. ### 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: 677
05-25-2016, 07:38 AM
38. ### 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: 1,034
05-25-2016, 06:15 AM
39. ### R help with Binary log reg

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

• Replies: 0
• Views: 1,137
05-22-2016, 01:24 PM
40. ### 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: 1,186
05-21-2016, 11:42 AM
41. ### 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: 1,257
05-20-2016, 12:41 PM
42. ### 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: 1,328
05-20-2016, 09:10 AM
43. ### 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: 1,062
05-18-2016, 01:14 PM
44. ### 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: 1,227
agp
05-18-2016, 08:08 AM
45. ### 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: 1,801
05-17-2016, 07:19 AM
46. ### 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: 1,449
05-16-2016, 08:36 AM
47. ### 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: 1,332
05-15-2016, 09:50 AM
48. ### 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: 1,238
05-15-2016, 08:58 AM
49. ### 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: 1,642
05-12-2016, 01:48 PM
50. ### 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: 1,291
05-10-2016, 03:57 PM
51. ### 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: 1,175
05-10-2016, 07:42 AM
52. ### 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: 1,265
05-09-2016, 09:44 AM

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