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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...

    Started by grunde88‎, 05-21-2014 08:39 PM
    coefficient, correlation, negative, positive, regression
    • Replies: 3
    • Views: 2,602
    05-22-2014, 08:38 AM Go to last post
  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. ...

    Started by jonwilliams‎, 01-24-2016 01:36 PM
    • Replies: 0
    • Views: 1,883
    01-24-2016, 01:36 PM Go to last post
  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...

    Started by arkiaamu‎, 10-11-2014 07:45 AM
    • Replies: 1
    • Views: 2,414
    10-11-2014, 10:07 AM Go to last post
  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....

    Started by Ravita‎, 04-24-2016 07:39 PM
    • Replies: 0
    • Views: 1,385
    04-24-2016, 07:39 PM Go to last post
  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...

    Started by sm34833‎, 03-12-2012 06:21 PM
    panel data, regression, structural equation model
    • Replies: 7
    • Views: 14,002
    03-14-2012, 10:57 AM Go to last post
  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...

    Started by MissEvil‎, 11-27-2011 08:23 AM
    • Replies: 1
    • Views: 2,152
    11-27-2011, 12:04 PM Go to last post
  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...

    Started by Oritteropus‎, 01-18-2012 05:39 AM
    • Replies: 5
    • Views: 8,076
    01-20-2012, 07:59 AM Go to last post
  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...

    Started by WeeG‎, 03-09-2011 02:46 AM
    • Replies: 1
    • Views: 3,350
    03-13-2011, 03:59 AM Go to last post
  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...

    Started by momo‎, 08-03-2012 09:51 PM
    • Replies: 0
    • Views: 1,607
    08-03-2012, 09:51 PM Go to last post
  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...

    Started by krytellan‎, 03-25-2014 11:01 AM
    • Replies: 1
    • Views: 1,347
    03-25-2014, 02:33 PM Go to last post
  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...

    Started by nziza‎, 11-11-2016 07:00 AM
    effect size, g*power, post-hoc, power analysis, simple linear regression
    • Replies: 0
    • Views: 2,165
    11-11-2016, 07:00 AM Go to last post
  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...

    Started by statto‎, 08-20-2011 09:39 AM
    2 Pages
    1 2
    rho/beta conflict, suppression
    • Replies: 23
    • Views: 55,643
    10-07-2016, 04:31 AM Go to last post
  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...

    Started by czeiny‎, 01-11-2012 02:16 PM
    • Replies: 2
    • Views: 4,067
    01-11-2012, 03:56 PM Go to last post
  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...

    Started by auroraborealis‎, 12-12-2016 07:37 AM
    regression analysis
    • Replies: 0
    • Views: 2,433
    12-12-2016, 07:37 AM Go to last post
  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...

    Started by biosci1978‎, 01-19-2016 03:54 PM
    linear regression, power analysis, sample size
    • Replies: 0
    • Views: 997
    01-19-2016, 03:54 PM Go to last post
  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...

    Started by mirt2013‎, 06-23-2015 09:27 PM
    cox regression and power
    • Replies: 0
    • Views: 1,211
    06-23-2015, 09:27 PM Go to last post
  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...

    Started by Servellen‎, 07-26-2010 03:59 AM
    • Replies: 1
    • Views: 2,895
    07-26-2010, 10:38 AM Go to last post
  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,...

    Started by psychstudent0798‎, 09-07-2017 08:00 PM
    power analysis, regression, time series regression
    • Replies: 1
    • Views: 215
    09-08-2017, 04:50 AM Go to last post
  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 ...

    Started by Mariana Ramos‎, 06-21-2011 05:00 AM
    effect size, power, quadratic effect, regression
    • Replies: 0
    • Views: 1,597
    06-21-2011, 05:00 AM Go to last post
  20. Question 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...

    Started by h_amer‎, 07-11-2016 08:30 AM
    non-linear, p-value, power regression, slope
    • Replies: 2
    • Views: 1,185
    07-11-2016, 10:26 AM Go to last post
  21. Question 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...

    Started by Student T‎, 01-29-2011 12:40 PM
    • Replies: 2
    • Views: 4,589
    01-31-2011, 04:32 AM Go to last post
  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...

    Started by dara‎, 07-23-2011 04:13 PM
    • Replies: 3
    • Views: 2,211
    07-26-2011, 09:28 PM Go to last post
  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...

    Started by coling‎, 07-24-2012 03:43 PM
    • Replies: 8
    • Views: 4,198
    07-24-2012, 05:50 PM Go to last post
  24. PP-Plot

    I sometimes, when doing linear regression get a normal p-p-plot of regression standardized residual that looks like the one below. Can I still use...

    Started by trexter‎, 08-11-2014 06:09 AM
    • Replies: 2
    • Views: 2,748
    08-11-2014, 10:12 AM Go to last post
  25. 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...

    Started by Oberon‎, 08-14-2013 06:08 AM
    • Replies: 1
    • Views: 2,114
    08-17-2013, 05:06 AM Go to last post
  26. 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...

    Started by PeterU‎, 05-20-2011 04:17 AM
    • Replies: 0
    • Views: 1,979
    05-20-2011, 04:17 AM Go to last post
  27. 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...

    Started by ilaria‎, 11-29-2013 06:19 AM
    • Replies: 2
    • Views: 1,690
    11-29-2013, 11:29 AM Go to last post
  28. 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...

    Started by MartyQ‎, 06-12-2013 01:06 PM
    • Replies: 4
    • Views: 1,826
    06-12-2013, 03:05 PM Go to last post
  29. 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...

    Started by Juan Lopez‎, 09-17-2012 12:51 PM
    • Replies: 1
    • Views: 2,826
    09-17-2012, 02:24 PM Go to last post
  30. 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....

    Started by j00sel00se‎, 03-14-2014 08:20 AM
    logistic regression, predictions
    • Replies: 4
    • Views: 2,535
    03-17-2014, 04:51 AM Go to last post
  31. Smile Predicted Probability

    Someone created a spreadsheet to graph predicted provability values on a Logistic Regression S Graph. There are four values used. a = Assumed...

    Started by R0NR0NS‎, 03-22-2016 10:43 AM
    • Replies: 2
    • Views: 1,094
    03-22-2016, 05:17 PM Go to last post
  32. 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...

    Started by jdm_dm‎, 01-05-2013 08:28 AM
    simple linear regression, standard deviation
    • Replies: 0
    • Views: 1,516
    01-05-2013, 08:28 AM Go to last post
  33. 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...

    Started by YaoPau‎, 02-14-2012 06:46 AM
    • Replies: 1
    • Views: 1,802
    02-14-2012, 12:31 PM Go to last post
  34. 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...

    Started by gaj‎, 06-07-2013 10:40 AM
    • Replies: 2
    • Views: 1,422
    06-07-2013, 12:28 PM Go to last post
  35. 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...

    Started by dude2000‎, 09-05-2012 10:53 AM
    • Replies: 0
    • Views: 888
    09-05-2012, 10:53 AM Go to last post
  36. 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); ...

    Started by CRNZNH‎, 12-08-2012 12:37 AM
    • Replies: 2
    • Views: 4,110
    04-09-2014, 02:26 PM Go to last post
  37. 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....

    Started by hasty82‎, 07-03-2014 05:45 AM
    • Replies: 0
    • Views: 1,000
    07-03-2014, 05:45 AM Go to last post
  38. 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...

    Started by Geof‎, 05-30-2013 05:20 AM
    • Replies: 1
    • Views: 1,657
    05-30-2013, 12:07 PM Go to last post
  39. 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...

    Started by Madeline‎, 02-18-2014 09:42 AM
    • Replies: 0
    • Views: 995
    02-18-2014, 09:42 AM Go to last post
  40. 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...

    Started by AquaMan‎, 09-11-2009 04:56 PM
    • Replies: 0
    • Views: 2,064
    09-11-2009, 04:56 PM Go to last post
  41. 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...

    Started by cyberbunny‎, 03-21-2009 07:30 AM
    • Replies: 0
    • Views: 2,746
    03-21-2009, 07:30 AM Go to last post
  42. 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...

    Started by Sparky‎, 01-10-2014 12:09 PM
    • Replies: 0
    • Views: 1,131
    01-10-2014, 12:09 PM Go to last post
  43. 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...

    Started by Rekize‎, 07-27-2013 12:07 PM
    generalized linear model, prediction interval
    • Replies: 0
    • Views: 1,326
    07-27-2013, 12:07 PM Go to last post
  44. 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...

    Started by gwlucas‎, 12-16-2014 09:47 AM
    • Replies: 3
    • Views: 1,395
    12-16-2014, 11:18 AM Go to last post
  45. 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...

    Started by Mukund‎, 03-07-2016 04:58 AM
    prediction interval, regression
    • Replies: 0
    • Views: 704
    03-07-2016, 04:58 AM Go to last post
  46. 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. ...

    Started by andrew01‎, 09-03-2008 06:48 AM
    • Replies: 0
    • Views: 3,396
    09-03-2008, 06:48 AM Go to last post
  47. 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...

    Started by mmercker‎, 03-15-2016 05:21 AM
    confidence interval, partial effect, regression plot
    • Replies: 0
    • Views: 1,139
    03-15-2016, 05:21 AM Go to last post
  48. 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...

    Started by chaps‎, 05-25-2011 04:24 AM
    • Replies: 9
    • Views: 4,895
    06-11-2011, 12:54 AM Go to last post
  49. 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...

    Started by fearless_fool‎, 10-07-2011 02:12 PM
    libsvm, prediction errors, regression
    • Replies: 2
    • Views: 2,661
    10-09-2011, 11:29 PM Go to last post
  50. 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...

    Started by CharlieMurphy‎, 07-02-2014 06:03 AM
    centering variables, least squares, log linear
    • Replies: 1
    • Views: 1,040
    07-02-2014, 01:18 PM Go to last post
  51. 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.

    Started by Cathy Carter‎, 12-10-2014 10:54 PM
    • Replies: 0
    • Views: 1,298
    12-10-2014, 10:54 PM Go to last post
  52. 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...

    Started by sigmundo‎, 07-08-2015 07:17 AM
    causal pathways
    • Replies: 5
    • Views: 1,458
    07-09-2015, 10:02 AM Go to last post
  53. predictor variables with many zeros

    My explanatory variables are count data and some have many zeros. In linear regression variance is increasing with increasing explanatory and...

    Started by matijas‎, 01-20-2014 06:29 PM
    • Replies: 6
    • Views: 2,931
    01-21-2014, 07:38 AM Go to last post
  54. 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...

    Started by julbeam‎, 05-01-2012 03:53 AM
    logistic regression, predictor, spss
    • Replies: 3
    • Views: 3,305
    05-01-2012, 02:08 PM Go to last post
  55. 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...

    Started by Julia18‎, 07-15-2015 02:35 PM
    • Replies: 5
    • Views: 1,685
    07-15-2015, 03:37 PM Go to last post
  56. 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...

    Started by David_D‎, 09-13-2014 03:33 AM
    • Replies: 0
    • Views: 1,119
    09-13-2014, 03:33 AM Go to last post
  57. 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 ...

    Started by gungor‎, 08-24-2013 05:09 AM
    • Replies: 4
    • Views: 1,874
    08-24-2013, 12:11 PM Go to last post
  58. 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...

    Started by mikeo1313‎, 12-01-2008 02:56 AM
    • Replies: 1
    • Views: 2,305
    12-01-2008, 03:14 AM Go to last post
  59. 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...

    Started by PKA111‎, 01-27-2013 03:17 PM
    • Replies: 9
    • Views: 41,579
    02-04-2013, 01:26 PM Go to last post
  60. 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...

    Started by chillpill2007‎, 12-06-2013 07:23 PM
    • Replies: 2
    • Views: 1,467
    12-09-2013, 01:08 PM Go to last post

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