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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. regression analysis for research

    hi there, working on a project in which we compare eye contrast among mammals at various points. We collected data (luminance value) for parts...

    Started by kelseyjo‎, 11-06-2015 08:20 PM
    • Replies: 0
    • Views: 1,427
    11-06-2015, 08:20 PM Go to last post
  2. Can you help me identify the right test for my data?

    I’m trying to identify the right statistical method to use. Here’s a case analogous to mine: Let’s say I’m interested in whether basketball team...

    Started by Frameshift‎, 11-06-2015 06:19 PM
    • Replies: 0
    • Views: 1,342
    11-06-2015, 06:19 PM Go to last post
  3. Adding main effects when main effects model is insignificant

    Hi, I have a linear model where both main effects are insignificant, and an overall insignificant model. Should I stop just stop there, or can I...

    Started by bryantw‎, 11-05-2015 05:57 PM
    • Replies: 1
    • Views: 1,107
    11-05-2015, 07:31 PM Go to last post
  4. Factor scores or mean values?

    Dear all, I hope I am in the correct forum and you can help me. At the moment I pursue a survey study. In the survey I obtain items that shall...

    Started by Ute1985‎, 11-05-2015 05:42 AM
    • Replies: 0
    • Views: 944
    11-05-2015, 05:42 AM Go to last post
  5. Question related to Generalized Linear Mixed Model

    I'm working with a dataset containing the following: Fixed variables: Age, Body Size, Antler Size, Average Age Random variable: Animal ID...

    Started by Sightfish‎, 11-04-2015 12:18 PM
    • Replies: 2
    • Views: 1,374
    11-04-2015, 10:55 PM Go to last post
  6. R Squared and dummy variables

    Hey, If you changed your model from one variable to a number of dummy variables, would the R^2 increase considerably, supposing that the dummy...

    Started by mhider‎, 11-01-2015 02:36 PM
    • Replies: 5
    • Views: 3,739
    11-03-2015, 02:11 PM Go to last post
  7. Odds ratio using the negative log-log link functin in ordinal logistic regression

    Hello, Below is a description of a statistical problem and questions for which I need clarification. The data I'm working on are from an online...

    Started by GLepage‎, 10-27-2015 10:27 AM
    • Replies: 1
    • Views: 2,643
    10-29-2015, 09:05 PM Go to last post
  8. Country-level Clustering

    Hi All, I have a database on firms that went bankrupt/not bankrupt from 1999-2011 across 30+ countries. I have included year fixed effects in my...

    Started by lucas111‎, 10-29-2015 12:04 AM
    • Replies: 1
    • Views: 1,322
    10-29-2015, 02:34 AM Go to last post
  9. Help with Hat Matrix

    considering the model Yi=β0+β1Xi+ϵi, i=1,2,3,Ö,n how can i calculate the hat matrix and what would element hij be ? thanks

    Started by jerry212‎, 10-28-2015 07:39 PM
    hat matrix, regression
    • Replies: 0
    • Views: 1,838
    10-28-2015, 07:39 PM Go to last post
  10. Question Partial Correlation question help

    Hi, I was wondering if you could help me. I've been set the problem below. I know how to work out the Partial Correlation and I could do it for A1 or...

    Started by jamesyp21‎, 10-28-2015 03:45 PM
    • Replies: 0
    • Views: 1,089
    10-28-2015, 03:45 PM Go to last post
  11. Interpreting a IV variable whose values have been changed

    Hello all, I'd just like to get advice on the following: I've got a few independent variables which had values ranging from -2.5 to 2.5. I...

    Started by ChrisUCT‎, 10-27-2015 12:08 PM
    • Replies: 1
    • Views: 1,124
    10-27-2015, 01:32 PM Go to last post
  12. Interaction/moderation in probit/logit

    Dear all, in my studies some (maybe trivial...?) questions on interaction/moderation in probit/logit regression came up. Imagine the following...

    Started by Ute‎, 10-17-2015 02:33 AM
    • Replies: 2
    • Views: 1,981
    10-26-2015, 12:49 PM Go to last post
  13. correlation in multi-level model

    In a multi-livel model where level 1 is within-person and level 2 is between-person, can level 1 be a simple correlation between two within-person...

    Started by ecnusbau‎, 10-23-2015 11:46 AM
    • Replies: 2
    • Views: 1,110
    10-23-2015, 01:40 PM Go to last post
  14. OR improving inmultyvariate logistic regression

    Hi! Does it make sense that odds ratio are getting better (higher) and more significant when moving from a univriate to a multivariate regression...

    Started by Doobdoob‎, 10-19-2015 01:43 PM
    • Replies: 10
    • Views: 1,613
    10-22-2015, 04:03 PM Go to last post
  15. Testing the equality of the Residual Sum of Squares of two linear models

    I have two models of a dependent variable: Y = a1 + b1X1 and Y = a2 + b2X2 The variances around the lines of least error are important...

    Started by BigBugBuzz‎, 10-22-2015 08:12 AM
    • Replies: 2
    • Views: 1,068
    10-22-2015, 09:19 AM Go to last post
  16. Question Need help with parallel mediated quadratic regression

    Dear friends, currently I am stuck with a problem I can't solve on my own - I hope some of you might have a bright idea :) I am looking for...

    Started by robeh‎, 10-19-2015 07:29 AM
    • Replies: 1
    • Views: 1,400
    10-22-2015, 06:18 AM Go to last post
  17. Help setting up a dataset for multi-level modeling

    Hi everyone, I'm new to multi-level modeling (MLM) and have a question about how to set up my data. My study design involved two between...

    Started by kelly.s‎, 10-20-2015 02:22 PM
    • Replies: 0
    • Views: 1,087
    10-20-2015, 02:22 PM Go to last post
  18. Redesigning a questionnaire (a bit long...)

    A quick background: I am trying to evaluate a questionnaire used to asses patients. It is used around the world to establish whether a patients...

    Started by j_cocker‎, 10-19-2015 04:59 AM
    • Replies: 0
    • Views: 1,424
    10-19-2015, 04:59 AM Go to last post
  19. Durbin-Watson bound dU>2.0

    Hello. I was wondering, how to interpret bounds of Durbin-Watson test (dU, dL) if dU is greater than 2.0. I know that it is an extreme case, but just...

    Started by harel‎, 10-17-2015 09:40 AM
    durbin-watson, ols regression
    • Replies: 0
    • Views: 2,233
    10-17-2015, 09:40 AM Go to last post
  20. regression for ordinal data?

    Hi All, I am looking at data showing injury to intervertebral discs. Injuries are graded on a 4 point scale with 0 being no damage and 3 being...

    Started by mac101‎, 09-27-2015 02:59 PM
    ordinal regression, regression analysis
    • Replies: 3
    • Views: 3,058
    10-17-2015, 06:19 AM Go to last post
  21. Does the intercept p value matter?

    Hi everyone, I work on a model with logistic regression as a result I have intercept value = 0.06 , with a p-value = 0.86. Does this model...

    Started by valko‎, 10-16-2015 06:56 AM
    • Replies: 5
    • Views: 2,300
    10-17-2015, 04:20 AM Go to last post
  22. Multilevel model with crossed random effects - does this model make sense?

    I have a complex design and haven't found similar examples online. I'd really appreciate any views on the way I modelled it. At a first stage, 19...

    Started by lucnv‎, 10-16-2015 05:44 PM
    crossed, mixed effects model, multi-level data, nested
    • Replies: 0
    • Views: 1,312
    10-16-2015, 05:44 PM Go to last post
  23. Durbin-Watson

    Hi, Do I need to run a Durbin-Watson test if I am finding regressions for the number of second-language words learnt in a week based on age in...

    Started by becread95‎, 04-29-2015 09:12 AM
    • Replies: 2
    • Views: 2,058
    10-16-2015, 04:18 PM Go to last post
  24. SE of Reference category in Multinomial Logit Model

    I used R to fit a Multinomial Logit model to my data. The data includes some categorical variables as effect coded variables. For example, one...

    Started by Hendrik6‎, 10-14-2015 12:29 PM
    effect coding, multinomial logit, reference category, standard error
    • Replies: 7
    • Views: 2,455
    10-15-2015, 09:55 AM Go to last post
  25. Comparing two factors in five areas

    I recently compared two factors in five different areas testing diversity of one factor against another. (Diversity was made quantitative for...

    Started by Patatas345‎, 10-14-2015 04:01 PM
    ancova, anova ecology biology, combining items, regression help, testing
    • Replies: 0
    • Views: 1,147
    10-14-2015, 04:01 PM Go to last post
  26. GLM multivariate analysis with proportion & continuous data

    Hi there, I am looking to perform some multivariate analysis on my data (such as canonical correlation analysis or multivariate multiple...

    Started by cmg212‎, 07-27-2014 12:06 PM
    • Replies: 1
    • Views: 2,892
    10-11-2015, 04:11 PM Go to last post
  27. Physics Teacher with a question of appropriate use of regression equaitons

    Is it ever acceptable to replace discrete measured values with a continuous function if you are certain you have the right model? For the last...

    Started by Mr. O‎, 10-10-2015 07:39 PM
    calculus, lab data, physics, regression analysis
    • Replies: 4
    • Views: 2,491
    10-11-2015, 01:56 PM Go to last post
  28. Testing a log transformed reg model with the non-log transformed

    Hello, I was wondering how one test two regression models against each other. One being the log transformed of the other like this: y = var1 +...

    Started by nanana‎, 10-08-2015 08:30 AM
    • Replies: 6
    • Views: 1,999
    10-10-2015, 02:40 PM Go to last post
  29. lagged variables in a model

    Hi, i am reading an academic article and i am not sure i understood the model correctly. 1. It is written that the dependent variable is...

    Started by ophiroz‎, 09-15-2015 01:04 PM
    • Replies: 4
    • Views: 1,897
    10-10-2015, 09:41 AM Go to last post
  30. Time Series Analysis with Triple exponential smoothing

    What would be the best formula to forecast a weeks worth of daily data?

    Started by mdo8105‎, 10-07-2015 03:16 PM
    • Replies: 3
    • Views: 1,519
    10-07-2015, 04:05 PM Go to last post
  31. AIC backward selection - control variables

    Hej! I have a question concerning AIC backwards selection. I am doing a Linear Mixed effect model where I have one main predictor and several...

    Started by puenktchen‎, 10-06-2015 09:37 AM
    • Replies: 2
    • Views: 1,475
    10-06-2015, 12:26 PM Go to last post
  32. scatter plot for partial regression (in spss)

    Hi all I have an SPSS regression model in which I have a dependent variable, an independent variable and 4 covariates. I want to create a...

    Started by Lee R.‎, 10-06-2015 10:46 AM
    partial regression, partial regression plot, regression, scatter plot, scatterplot
    • Replies: 0
    • Views: 2,400
    10-06-2015, 10:46 AM Go to last post
  33. Leave one out cross validation

    Hi everybody, I've done a linear regression analysis with forward selection method. my number of observations are 32 and the final model selected 2...

    Started by Bahareh‎, 09-27-2015 07:56 AM
    loocv, regression
    • Replies: 3
    • Views: 2,880
    10-06-2015, 01:09 AM Go to last post
  34. Problem with Greene Econometric Analysis 7th Edition demand example page 110

    Strange question, I know, but I am unable to reproduce the results shown when he adds a lagged dependent variable to his gasoline demand function....

    Started by Rod‎, 10-04-2015 09:53 PM
    • Replies: 0
    • Views: 1,388
    10-04-2015, 09:53 PM Go to last post
  35. Automatically finding relationships between 3 or more variables

    Hello, Total newbie here - but I'm hoping someone can help me out. I have finished running a multiple regression analysis and have my results....

    Started by Tzo‎, 10-02-2015 07:37 PM
    • Replies: 0
    • Views: 846
    10-02-2015, 07:37 PM Go to last post
  36. Ordinal regression shows negative effect when spearman correlation shows positive

    I running a regression model where a variable is indicated to have a negative impact on the predicted variable: Estimate Std....

    Started by micdhack‎, 09-30-2015 12:26 PM
    • Replies: 8
    • Views: 2,527
    10-01-2015, 02:35 PM Go to last post
  37. The best formula to use in excel to forecast daily call volume?

    I have used single and double exponential smoothing, but did not know if there is a more accurate approach to predict how many calls that can be...

    Started by mdo8105‎, 09-24-2015 03:16 PM
    holt winters, regression analysis, time series forecast
    • Replies: 4
    • Views: 6,922
    10-01-2015, 01:46 PM Go to last post
  38. Cross validation

    Hello, I have a basic question about cross validation and regression model. what is the final regression model made from? I mean the final model...

    Started by Bahareh‎, 10-01-2015 03:53 AM
    • Replies: 5
    • Views: 3,319
    10-01-2015, 12:07 PM Go to last post
  39. how to calculate co-efficients

    Hi all, This is my first post on this forum. Lets say I have, x vectors (-0.0028, 5.0028, 10.0085, 15.0085, 20.0028) y vectors (0, 5, 10, 15,...

    Started by hemnath‎, 09-25-2015 05:48 AM
    • Replies: 7
    • Views: 3,197
    09-30-2015, 10:10 PM Go to last post
  40. How to treat missing IV cases in logistic regression?

    Hey folks, quick question: I am analyzing consumers advertising click behavior (click/no-click =DV) and two IVs in this model are the location of...

    Started by oniontoast‎, 09-30-2015 10:52 AM
    • Replies: 4
    • Views: 2,733
    09-30-2015, 01:38 PM Go to last post
  41. Estimate or Contrast Statement in ANOVA

    Hey, I was asked to review a student's paper. In it they have 2 exposures groups and multiple continuous outcomes they are examining. They...

    Started by hlsmith‎, 09-30-2015 09:39 AM
    • Replies: 1
    • Views: 1,727
    09-30-2015, 11:00 AM Go to last post
  42. Confused about how to proceed

    Hi all, I have Y vectors = (0, 5, 10, 15, 20) At Condition1, x Vectors = (-0.0056, 5.0000, 10.0057, 15.0057, 20.0000) At Condition2, x vectors =...

    Started by hemnath‎, 09-26-2015 12:32 AM
    • Replies: 1
    • Views: 1,055
    09-30-2015, 02:51 AM Go to last post
  43. Normal logistic regression vs a mixed model; which to use? benefits gained?

    I have some evidence to suggest that one vaccine was far superior over another and resulted in the local elimination of a disease. Because it affects...

    Started by Johann Kotze‎, 09-18-2015 09:48 AM
    health research, logistic regression, mixed model
    • Replies: 6
    • Views: 2,079
    09-29-2015, 11:23 AM Go to last post
  44. Linear, step wise regression vs binary logistic regression - which method to choose

    Dear friends I have a dilemma about choosing a right logistical method. i want to find predictor factors of life satisfaction and have 5...

    Started by badibad‎, 09-28-2015 05:33 PM
    • Replies: 7
    • Views: 1,910
    09-29-2015, 07:46 AM Go to last post
  45. Use predicted values or residuals in the second stage?

    Hello all: I have a panel dataset (firms) in which some variables are "choice" variables (that is, they reflect executives' free choices as well...

    Started by jayhawk‎, 09-28-2015 06:29 PM
    endogeneity, panel data, predicted values, residuals, two stage model
    • Replies: 0
    • Views: 1,050
    09-28-2015, 06:29 PM Go to last post
  46. Strange results in univariable linear regression when groups are stratified

    Dear Forum users, I am stuck with some unusual results and would appreciate some ideas as to why/how this happened. Iím testing the relationship...

    Started by MHS‎, 09-27-2015 06:15 AM
    simpson's paradox
    • Replies: 1
    • Views: 2,013
    09-27-2015, 07:18 AM Go to last post
  47. Poisson model on moving averages: non-discrete

    I have a model that is based on counts of cases. It follows a poisson distribution quite well but we are unhappy about the results of the model. In...

    Started by Johann Kotze‎, 09-26-2015 04:21 AM
    continuous variable, poisson
    • Replies: 1
    • Views: 1,967
    09-26-2015, 05:45 AM Go to last post
  48. Regression and imputing zeros

    Hi all! I have what is likely a simple regression problem. I am imputing Variable X from survey Y to survey Z. I am using a simple linear...

    Started by domwebber‎, 08-28-2015 03:55 AM
    hotdeck, imputation, linear regression, stata 12
    • Replies: 2
    • Views: 2,300
    09-24-2015, 02:16 PM Go to last post
  49. Question If B predicts A, can A also predicts B?

    Hi everyone, I'm new to multiple regression analysis. I have a question and I hope someone can help answer it. Thank you. In a multiple regression...

    Started by statsnewbie28‎, 09-23-2015 11:04 AM
    dependent variable, multiple regression, predictors
    • Replies: 9
    • Views: 4,627
    09-24-2015, 12:55 PM Go to last post
  50. How to deal with repeated measures data in multiple linear regression?

    Hello, I am a novice in the area of regression analyses, and was hoping someone could shed some light on my situation. I will be conducting a...

    Started by tylerbweaver‎, 09-22-2015 09:56 AM
    • Replies: 8
    • Views: 2,021
    09-22-2015, 03:51 PM Go to last post
  51. Is it linear regression ?

    Hello , according to https://en.wikipedia.org/wiki/Polynomial_regression#Definition_and_example the equation is linear regression . I...

    Started by civilized‎, 09-22-2015 04:07 AM
    • Replies: 2
    • Views: 1,804
    09-22-2015, 10:54 AM Go to last post
  52. Help with First Differencing in STATA

    Hello I am a student working with STATA for the first time. I am using panel data for the English Premier League football from 2010 to 2015 and am...

    Started by Ekhanolkar18‎, 09-21-2015 05:45 PM
    first difference, panel data
    • Replies: 1
    • Views: 1,714
    09-22-2015, 02:43 AM Go to last post
  53. Correcting for regression to the mean in mixed effects model of longitudinal data?

    Hey everyone, I know you can correct for regression to the mean for two time points, in a before and after scenario. But does anyone know how to...

    Started by imahumaneater‎, 09-21-2015 02:35 PM
    correlation, longitudinal data, mixed effects, random effects, regression to the mean
    • Replies: 0
    • Views: 1,808
    09-21-2015, 02:35 PM Go to last post
  54. Time Series Regression Approach

    My goal is to predict monthly S&P 500 values using a single indicator data set (For example, Unemployment Rates ) My approach has been to extract...

    Started by kimberly_h_1986‎, 09-20-2015 01:41 PM
    speculative markets
    • Replies: 1
    • Views: 1,342
    09-20-2015, 04:52 PM Go to last post
  55. Linear mixed models? MANOVA? I'm confused...

    Iím a newbie in statistics and R, so I hope that my question isnít too banal for you. Iím going to carry out an experiment in order to verify...

    Started by piravi1980‎, 09-20-2015 01:44 PM
    • Replies: 0
    • Views: 1,195
    09-20-2015, 01:44 PM Go to last post
  56. Reporting the formula for a mixed model in a paper

    I want to report the basic formula of my mixed model. Everywhere I look for a template the equations seem way too complicated for a journal whose...

    Started by Johann Kotze‎, 09-20-2015 03:41 AM
    mixed model
    • Replies: 1
    • Views: 1,358
    09-20-2015, 07:08 AM Go to last post
  57. Unhappy Please help me run my data by probit regression

    I have a data for my lesson, but i can not run it in probit. I can not understand the total observed in probit what it is. Or help my run by probit...

    Started by ongquangthai‎, 09-17-2015 09:22 PM
    • Replies: 2
    • Views: 2,517
    09-18-2015, 07:35 AM Go to last post
  58. Question Spatial econometrics:heteroskedasticity and autocorrelation consistent(HAC) estimator

    Good afternoon, I have quite basic question however I would like to be sure in this. If I use a HAC estimator of the variance-covariance (VC)...

    Started by Melisandre‎, 09-18-2015 07:13 AM
    • Replies: 0
    • Views: 1,336
    09-18-2015, 07:13 AM Go to last post
  59. reading excel file /text file in R

    I am naive programmer..i am working on regression analysis. when i say read.table("filename.txt",header=FALSE)..where does R searches for the file?...

    Started by scuby‎, 09-17-2015 02:00 PM
    • Replies: 6
    • Views: 1,745
    09-17-2015, 10:25 PM Go to last post
  60. Stepwise Logit Regression - Drop of variables

    Dear All, I have a small question I hope you could help me with. I am trying to find a predictive model for a dataset doing a stepwise logit...

    Started by Speku‎, 09-13-2015 09:57 PM
    drop variables, stata, stepwise regression
    • Replies: 0
    • Views: 1,316
    09-13-2015, 09:57 PM Go to last post

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