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Dason ‎(Devorador de queso)
05-10-2017
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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. Multivariate normality

I know various methods of determing if the bivariate relationship of two variables are normal. But, as Dason has drilled into me, its multivariate...

• Replies: 50
• Views: 11,062
09-02-2013, 10:04 PM
2. Assumptions of logistic regression

Anyone know a good authoritative source for the assumptions of logistic regression? They differ obviously from OLS and I have not found a good source...

• Replies: 47
• Views: 84,297
11-29-2011, 07:40 PM
3. Understanding Multilevel Model

I'm slowly working through multilevel models and have a pretty specific question/though checking. Here's some R code: library(lme4);...

• Replies: 47
• Views: 10,087
02-23-2014, 11:48 PM
4. Linear regression with non-normal data?

It is my understanding that for linear regression both data sets must be normally distributed. One of my two sets of data (x) is normally...

• Replies: 43
• Views: 81,219
07-15-2013, 10:15 PM
5. Nested ANOVA - Replication vs. Pseudoreplication - pulling hair out, please help

Hello all, I am trying to run a nested ANOVA in JMP on some ecological field data - I'm trying to measure whether fish biomass is different in...

• Replies: 30
• Views: 14,339
02-15-2012, 12:22 AM
6. Vote Fraud in Iowa??? Tell me how this is statistically possible please!

NOTE: UPDATED, PLEASE SEE MY COMMENT #26 ON PAGE TWO. Ok... Please be easy on me... One, I'm new here. Two, it has been a long time...

• Replies: 27
• Views: 6,405
10-08-2012, 01:53 PM
7. bonferroni correction in multivariate regression

hi, I just read something that made me think about this, the p-values we calculate in a multiple regression have no adjustment for multiple test (...

• Replies: 27
• Views: 6,841
12-01-2014, 06:34 PM
8. Regression analysis with independant variable (error) and multiple dependant variable

So I took a lot of data (~10000) on a machine (3D printer). For each reading, I got the error and a lot of different parameter (speed, voltage,...

• Replies: 26
• Views: 7,018
11-21-2014, 08:24 AM
9. Hosmer and Lemeshow Test is significant

Hi all, can anyone tell me if one can still use a model which reports a H&L test with significant chi-square? (I have a very large sample - + 100...

• Replies: 25
• Views: 21,092
05-16-2013, 09:49 AM
10. Binary Logistic Regression in R

Warning: this is going to be a long post. Acknowledgement: Thanks to The Ecologist for getting me started on what I hope is the right road. This...

• Replies: 24
• Views: 23,729
12-16-2008, 03:21 AM
11. how to prove COV(y bar, estimated beta1) in linear regression equals 0

Yi=Xi*beta1 + beta0 + error Prove: COV(average of Yi, estimated beta1) = 0 Thanks!

• Replies: 24
• Views: 44,049
09-10-2015, 12:27 AM
12. Link function for proportional outcome

I have a data set where the outcome variable is percent passing (ELA and Math tests) for school districts. I will use a 2 level multilevel model...

• Replies: 24
• Views: 5,103
05-06-2014, 06:39 PM
13. What is the difference between an interaction effect and a moderator in regression?

I hear these two concepts a lot in the literature. I have no idea what the difference is between a moderator and an interaction term. While I am...

• Replies: 24
• Views: 4,080
02-24-2016, 03:02 PM
14. Postive correlation but negative coefficient in regression??

Im a little confused by some results I have..... I have two predictor variables and an outcome variable. The first predictor is positively...

• Replies: 23
• Views: 57,444
10-07-2016, 04:31 AM
15. ANOVA with multiple imputed Data

Hello :) I used multiple imputation on my data to get a complete data set. I want to do a ANOVA now. Does anybody know how to do that correctly? ...

• Replies: 23
• Views: 1,287
09-15-2017, 04:15 AM
16. Hypotheses testing if R²=1

Dear all, Since the R² value of my regression model is one, I can neither conduct a t-test nor a F-test. Is this a problem with regard to...

• Replies: 21
• Views: 25,923
04-11-2014, 02:30 PM
17. Need help with regression statistics analysis

Hello I need serious help. I did my last project fine. I've followed all my instructions for this final project, and did everything, but the part to...

• Replies: 20
• Views: 7,721
04-19-2006, 10:20 PM
18. What test if no linearity

Dear forum members, I am currently struggling with my research about boardmembers and their influence on the strategy. From other articles I...

• Replies: 20
• Views: 3,506
11-18-2013, 04:15 PM
19. Hypothesis

If you got this model: mode 1) y=a +b1x1 + b2x2 + u and this: mode 2) y=a + b1(x1-x2) + u What do you call the restriction there has...

• Replies: 19
• Views: 5,838
08-15-2011, 09:21 AM
20. how to calculate the significance of an R2 increase (based only on results in paper)

Recently I have come across several articles that report OLS results of models with increasing numbers of variables. In the articles the R2 and...

• Replies: 19
• Views: 22,454
11-17-2011, 09:27 AM
21. Probit Regression?

So I was working on a Logistic Regression with binary DV, but now it turns out that the DV is actually probabilities such that they are between 0 and...

• Replies: 19
• Views: 3,154
08-17-2012, 12:01 PM
22. Interaction effect in a logistic regression between cont and cat variables.

Hi guys, I am conducting a logistic regression on whether a participants test positive or not to HIV (1=positive; 0 Negative) in a sample of...

• Replies: 19
• Views: 6,100
04-30-2013, 10:28 AM
23. Logistic regression diagnostic questions

I have a set of 42 variables which I am trying to determine the relative importance of. Well I already did but now I am trying to determine if...

• Replies: 19
• Views: 6,090
03-20-2013, 10:40 AM
24. Dummy Variables

Is there a limit to the number of independent variables that can be dummy coded for multiple regression as well as linear regression. In other words,...

• Replies: 18
• Views: 5,103
08-20-2012, 05:15 PM
25. Proper Interpretation of odds ratio less than 1 for my study

Hello everyone, This is for a PhD, research in psycholinguistics. I have done logistic regression analyses where some chosen predictor...

• Replies: 18
• Views: 33,611
03-25-2016, 03:55 PM
26. All my coefficients are statistically significant

Hi All, I am running a fixed effects model in stata, but all my independent variables are statistically significant. I am wondering if I am doing...

• Replies: 18
• Views: 5,973
10-03-2013, 06:21 PM
27. Why a simple linear regression (OLS)

Hi! This forum is so helpful :tup: I just can't seem to find an answer to my question though. I am planning on doing a multiple regression...

• Replies: 18
• Views: 5,178
03-08-2017, 04:04 AM
28. which regression model for time series?

Hi guys, please help. I need to do regression analysis for demographic data. I am not sure whether linear or logistic regression would be...

• Replies: 17
• Views: 11,212
03-02-2011, 10:59 AM
29. Necessary to rank transform ANCOVA?

Hi all, I'm hoping you can shed some light. My data are non-parametric, so I thought I'd have to use ranks in order to do ANCOVA, but then I read...

• Replies: 17
• Views: 3,527
08-25-2016, 01:10 AM
30. Relative impact of an X on Y.

This is probably the most important question I get asked to do, and I have never found a great answer for it (of course there may not be one). If you...

• Replies: 17
• Views: 3,835
03-14-2017, 03:32 PM
31. How can this be true [linear versus logistic regression]

This comes from a government study that was used to generate something of great importance, funding and related factors for a major government...

• Replies: 17
• Views: 6,394
01-15-2017, 02:51 PM
32. Beta positive - Slope of best fit line negative

hello, scratching my head over some regression output i'm getting from Excel. as you can see from below, the best fit line on my indeptendent...

• Replies: 16
• Views: 10,565
12-01-2011, 03:20 PM
33. GLM: Assumptions and choosing a model

Hello all, I have a question that I would be interested in hearing other's opinions/feedback. I have monthly cost data from 2006 to 2011 (72...

• Replies: 16
• Views: 6,962
08-24-2012, 06:26 PM
34. How to choose data for your regression

Hi guys, I'm developing a statistical method to analyse a player's performance in tennis (annotation). To do this I need to decide on certain...

• Replies: 16
• Views: 4,946
07-19-2013, 12:16 PM
35. Unobserved heterogenity

This is a signficant problem potentially for Cox and logistic regression. I have never found a test for whether it exists. I doubt there is one, but...

• Replies: 16
• Views: 3,946
01-27-2015, 02:01 PM
36. 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: 4,193
05-01-2016, 09:39 PM
37. Regression when outcome is a rank?

Is there a particular kind of regression if the outcome is a ranking? I'm wondering if my best bet would be to use the central limit theorem and use...

• Replies: 15
• Views: 20,911
12-14-2011, 02:36 PM
38. Binomial regression with x as the dependent variable and n as an independent variable

Hi all I have a sample size of 100. Out of 100 a certain number are successful at stage one. Of those successful at stage one some are successful...

• Replies: 15
• Views: 4,567
03-08-2012, 05:59 PM
39. hierarchical regression for controlling variables?

For my dissertation, my supervisor told me to do a regression analysis and control for 2 variables. So should I report in my dissertation that I have...

• Replies: 15
• Views: 12,866
08-07-2012, 09:41 AM
40. [SPSS] Multivariable logistic regression - how to transform to achieve linearity?

Hi, I am doing a project to identify variables that can predict rehospitalisations. There are a few categorical and continuous variables that I...

• Replies: 15
• Views: 15,473
08-12-2013, 07:05 PM
41. Bayesian approach for logistic regression models? (the case of low-count cells)

so... now that i'm a PhD student my advisor wants me to help out people with their projects. as fate may have it, the same problem has arisen both in...

• Replies: 15
• Views: 5,866
12-10-2013, 01:54 PM
42. Doing correct backwards elimination with interaction terms?

I'm wondering about this, and I can't find an answer anywhere. My textbook (Agresti and Finlay 2009) clearly says how to do backwards elimination on...

• Replies: 15
• Views: 7,359
01-27-2015, 10:27 AM

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