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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Positive correlations to dependent variable, but negative coefficients

First of all, sorry for the huge pictures, but I'm in desperate need of some input and help on the results following a study. I'm trying to interpret...

• Replies: 3
• Views: 2,602
05-22-2014, 08:38 AM
2. ### Positive definite issue with Likert data

Hello, I ran my first data set through SPSS for a recent 5-point Likert questionnaire but am returning a "not positive definite" on the reduction. ...

• Replies: 0
• Views: 1,883
01-24-2016, 01:36 PM
3. ### positive loglikelihood?

It seems to be no issue to have positive log likelihood in linear regression. How should I however interpret two positive LLs? In normal situation...

• Replies: 1
• Views: 2,414
10-11-2014, 10:07 AM
4. ### Positive Pearson Correlation but negative coefficient

Dear All I am trying to create a regression model for estimating electricity demand. The independent variables considered are population and GDP....

• Replies: 0
• Views: 1,385
04-24-2016, 07:39 PM
5. ### Possible to analyze cross lag panel data with regression alone (no SEM)?

I have 2 (soon to be 4) waves of panel data. I have a relatively small sample size so I don't think I should use SEM - also I don't really...

• Replies: 7
• Views: 14,002
03-14-2012, 10:57 AM
6. ### Possible to do a post hoc correction?

I am trying to understand a multiple regression problem I have. The problem is that one of my independent variables has a bivariate correlation to...

• Replies: 1
• Views: 2,152
11-27-2011, 12:04 PM
7. ### Post hoc in ANCOVA

I'm trying to conduct a post hoc test on the results of an ANCOVA: > model <- aov(Max~Weight*Diet) > summary(model) But when I run the Tukey...

• Replies: 5
• Views: 8,076
01-20-2012, 07:59 AM
8. ### Post Hoc or Contrasts ?

Hi Guys, I have a theoretical question... Someone asked me today what's better to perform while using Analysis of variance: a prior analysis...

• Replies: 1
• Views: 3,350
03-13-2011, 03:59 AM
9. ### post test

Dear all I run OLS regression and I have to test for Akaike info criterion, Schwarz criterion, Hannan-Quinn criterion, Durbin watsonstat, S.E OF...

• Replies: 0
• Views: 1,607
08-03-2012, 09:51 PM
10. ### Post-hoc MR study

Hey everyone. I offered to help a faculty member prepare a manuscript from some data that had previously been collected via survey. This is a...

• Replies: 1
• Views: 1,347
03-25-2014, 02:33 PM
11. ### Post-Hoc Power Analysis (G*Power) for simple linear regression

Hey everyone! I conducted a simple linear regression with non-significant results. Now I would like to analyze the power of this calculation using...

• Replies: 0
• Views: 2,165
11-11-2016, 07:00 AM
12. ### 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: 55,643
10-07-2016, 04:31 AM
13. ### potential heteroskedasticity & autocorrelation problem with pooled cross-section data

hello 1) my data: i have collected a few thousand property transactions over the last 15 years. for each transaction i have got the price and the...

• Replies: 2
• Views: 4,067
01-11-2012, 03:56 PM
14. ### Poverty analysis and multiple linear regression

Hi. I have a dataset and I intend to use multiple linear regression analysis with excel since the dataset isn't that massive in volume, just about...

• Replies: 0
• Views: 2,433
12-12-2016, 07:37 AM
15. ### Power analysis and sample size

Hello all, I've used perused this site numerous times in the past for assistance with statistical issues, but this is my first post. I work with...

• Replies: 0
• Views: 997
01-19-2016, 03:54 PM
16. ### Power analysis for Cox regression...a twist?

Hello, I am planning prospective trial using secondary data. My sample size is 480. I am using an artificial grouping based on an experimental...

• Replies: 0
• Views: 1,211
06-23-2015, 09:27 PM
17. ### Power analysis for multiple regression question

Hi All, I am setting up research design using multiple regression in developmental psychology context, using: 2 predictors where each can be...

• Replies: 1
• Views: 2,895
07-26-2010, 10:38 AM
18. ### Power analysis for time series regression

Hello, I'm trying to determine the sample size I need for a study. In the analysis, I will be including three predictors (score on a questionnaire,...

• Replies: 1
• Views: 215
09-08-2017, 04:50 AM
19. ### Power calculation in regression for curviliear effect

Hi! I performed a regresson analysis to test a curvilinear effect. I've followed Aiken & West procedures Center X, Squared centered X ...

• Replies: 0
• Views: 1,597
06-21-2011, 05:00 AM
20. ### Power function - finding if the slope is significant or not?

Hi, I'm using power functions to look at a relationship between time and age and I need to be able to test whether or not the slope of this...

• Replies: 2
• Views: 1,185
07-11-2016, 10:26 AM
21. ### Power, Sample Size, Interactions ?

Hello Everyone BACKGROUND I am working on a psychology project. Initially, I was going to do two separate regressions for each ethnic group but...

• Replies: 2
• Views: 4,589
01-31-2011, 04:32 AM
22. ### Power-law relation (Help Please)

Hi there, I wonder if you can kindly help me with questions below 1) I have data to apply for a power-law relation (A=B*C^D). I am using excel to...

• Replies: 3
• Views: 2,211
07-26-2011, 09:28 PM
23. ### Poynomial Regression through the origin

I am trying to program in SQL a polynomial regression of degree two with a zero intercept. I can't seem to find the appropriate literature on this...

• Replies: 8
• Views: 4,198
07-24-2012, 05:50 PM
24. ### Pre-processing inputs for a Logistic Regression

Hi everyone, I recently learned about logistic regressions on my own and wanted to create a credit card default model. My question (perhaps...

• Replies: 1
• Views: 2,114
08-17-2013, 05:06 AM
25. ### Precautions when using multiply imputed data in pooled OLS regression

Dear all I am doing a straightforward pooled linear regression on a panel dataset (45 countries, 20 years) using OLS and relevant time dummies and...

• Replies: 0
• Views: 1,979
05-20-2011, 04:17 AM
26. ### Predict group B membership from group membership A

Hi there, I have an interesting case to solve and I'm very curious to understand how I can implement it. I've done study where a number of...

• Replies: 2
• Views: 1,690
11-29-2013, 11:29 AM
27. ### Predict race outcome off expert predictions of outcome

Hi, I'm new to this forum and found a late 2011 discussion of the relevance of regression analysis of rank outcome interesting. I have used...

• Replies: 4
• Views: 1,826
06-12-2013, 03:05 PM
28. ### Predict variation

Hi, could please help me figure out how to find this on stata? How much of the variation for y is explained by x? Is the value of x a good...

• Replies: 1
• Views: 2,826
09-17-2012, 02:24 PM
29. ### Predicted probabilities from logistic regression

Hi, I have carried out logistic regression in STATA to adjust for several patient characteristic variables that are thought to affect my outcome....

• Replies: 4
• Views: 2,535
03-17-2014, 04:51 AM
30. ### Predicted standard deviation with simple linear regression

Hey, I am working on a prediction of wind speed. I'm using two datasets, one with 10 years of data, one with 1 year. I perform a simple linear...

• Replies: 0
• Views: 1,516
01-05-2013, 08:28 AM
31. ### Predicting a Ratio, when the denominator of that Ratio is a logical weight variable

I am attempting a basketball regression. The dataset is a bit complicated to explain, but basically each observation represents a stint of 5 players...

• Replies: 1
• Views: 1,802
02-14-2012, 12:31 PM
32. ### Predicting cutoff point of a peak

I have a gaussian bell shaped chromatographic peak in which my 3 closely related impurities are getting separated (In the same peak). There is a...

• Replies: 2
• Views: 1,422
06-07-2013, 12:28 PM
33. ### Predicting non linear value

Hello, sorry to cross post, but I initially posted this in the wrong forum. Im trying to build a model to project the number of customer reviews...

• Replies: 0
• Views: 888
09-05-2012, 10:53 AM
34. ### Predicting rare events using weight-adjusted logistic regression

This is a simulation study I adapted from sas website. Suppose my probably follows the following relationship, x=rannor(12342); ...

• Replies: 2
• Views: 4,110
04-09-2014, 02:26 PM
35. ### Predicting sales with customer types

Hi All, I've been given some data on the number of households of each type in a postal area and the sales figure for that postal area. e.g....

• Replies: 0
• Views: 1,000
07-03-2014, 05:45 AM
36. ### Predicting the increase of one variable by the height of another variable

Hi everybody, I have the following question: I have two continuous variables (assertiveness & team-identification). I have measured...

• Replies: 1
• Views: 1,657
05-30-2013, 12:07 PM
37. ### Predicting the rank of a candidate on a party list - Help requested

Dear all, My name is Madeline, I am doing research on party list rankings for open list PR elections (where votes are cast on a single...

• Replies: 0
• Views: 995
02-18-2014, 09:42 AM
38. ### predicting X using multiple regression?

Hello: I have been reviewing a study in which Multiple Linear Regression (MLR) was used to evaluate the relationship between the concentration of...

• Replies: 0
• Views: 2,064
09-11-2009, 04:56 PM
39. ### Prediction interval behaviour close to the origin

Hi I have a simple linear regression model, for which I have calculated the Confidence and Prediction Intervals. The model is fixed at the origin...

• Replies: 0
• Views: 2,746
03-21-2009, 07:30 AM
40. ### prediction interval for 2nd order regression?

Greetings – my first post here. I found this forum by a Google search – you were the top hit. It has been years since I had stats but because of...

• Replies: 0
• Views: 1,131
01-10-2014, 12:09 PM
41. ### Prediction interval of generalized linear models

When doing predictions using a generalized linear model, how to get the prediction interval or prediction distribution? My model has a gamma...

• Replies: 0
• Views: 1,326
07-27-2013, 12:07 PM
42. ### Prediction interval using a function that combines regression parameters

I have a question about the prediction interval on a function that combines parameters obtained via linear regression. I was wondering if someone...

• Replies: 3
• Views: 1,395
12-16-2014, 11:18 AM
43. ### Prediction Intervals

I am in the process of calculating the prediction intervals on a time series data linear regression model The independent variable in my model is...

• Replies: 0
• Views: 704
03-07-2016, 04:58 AM
44. ### Prediction Limits

Morning everyone. First thread, so take it easy on me. I am using a holt-winters times series to predict future call and transactional volume. ...

• Replies: 0
• Views: 3,396
09-03-2008, 06:48 AM
45. ### Prediction Plot with CI's: What to do with covariates?

Hi, I have a multiple regression model (especially a GLMM), with - outcome Y, - a fixed effect predictor wich is in the main focus of...

• Replies: 0
• Views: 1,139
03-15-2016, 05:21 AM
46. ### Prediction Region/Set from Multiple Logistic Regression

Hello all, I'm not sure how easy or difficult the following question actually is but for all my efforts I haven't been able to find the answer, if...

• Replies: 9
• Views: 4,895
06-11-2011, 12:54 AM
47. ### prediction using training data != training data

(Full disclosure: This is a cross-post from the Kernel Machines Forum) I'm using LIBSVM for regression analysis and, despite double checking my...

• Replies: 2
• Views: 2,661
10-09-2011, 11:29 PM
48. ### Predictions after mean-centred regression

Hi, I wonder if anyone can help me with a problem I'm having. I just performed an ordinary (LS) regression in which both the dependent and...

• Replies: 1
• Views: 1,040
07-02-2014, 01:18 PM
49. ### Predictions of new data based on an existing model

Could someone help how to use an existing model (in this case it is model derived from discriminant analysis) to predict a new data set.

• Replies: 0
• Views: 1,298
12-10-2014, 10:54 PM
50. ### predictor 2 on the causal pathway between predictor 1 and outcome

Hi: This is re-post of a something I put in the 'statistics' forum a while ago. There were 75 views but no responses, so I thought I try again in...

• Replies: 5
• Views: 1,458
07-09-2015, 10:02 AM
51. ### Predictors in Logistic regression, SPSS

Hello. I have the problem I can’t deal with. Maybe you can help me? You see, I have 2 samples in retrospective cohort study – cases (include 29...

• Replies: 3
• Views: 3,305
05-01-2012, 02:08 PM
52. ### Preference Share + Regression

I have conducted a conjoint survey evaluating several combinations of user and devices, with the end goal of calculating a preference share of each...

• Replies: 5
• Views: 1,685
07-15-2015, 03:37 PM
53. ### Preliminary Analysis in MultiLevel Analysis

Hallo there, my name is David. I am currently trying to do a multi level analysis. I am attempting a simple multilevel analysis. One of my...

• Replies: 0
• Views: 1,119
09-13-2014, 03:33 AM
54. ### Preprocessing Variables before Regression

I have variables x1,x2,x3 and result y. I have a problem that multiple tuples of variables are matched with a single y. For example x1 x2 x3 ...

• Replies: 4
• Views: 1,874
08-24-2013, 12:11 PM
55. ### price determination prediction

Its been 2 years since my last statistics class. I did fairly well but the material isn't so fresh since I haven't had to use it. I am writting a...

• Replies: 1
• Views: 2,305
12-01-2008, 03:14 AM
56. ### Price Elasticity based on log regression

Hello genius people!! 1) If i understand correctly, In the regression equation below, WS= White shoes BS=Black shoes Sales of WS = β1...

• Replies: 9
• Views: 41,579
02-04-2013, 01:26 PM
57. ### Price endogeneity

Hi experts, I am trying to make a demand model for hotel rooms using OLS regression. I got booking data for my hotel for 4 years and have the...

• Replies: 2
• Views: 1,467
12-09-2013, 01:08 PM

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