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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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...

    Started by kzhou‎, 05-29-2016 09:52 AM
    fixed regressor, linear regression, stochastic regressor
    • Replies: 3
    • Views: 437
    05-30-2016, 10:16 PM Go to last post
  2. 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...

    Started by KV Weyde‎, 05-30-2016 05:49 PM
    mixed models, stata, time-varying covariate
    • Replies: 0
    • Views: 416
    05-30-2016, 05:49 PM Go to last post
  3. 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,...

    Started by Martin Marko‎, 05-30-2016 03:52 PM
    • Replies: 0
    • Views: 216
    05-30-2016, 03:52 PM Go to last post
  4. 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...

    Started by Zore‎, 05-25-2016 09:36 PM
    • Replies: 3
    • Views: 336
    05-30-2016, 08:05 AM Go to last post
  5. 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...

    Started by noetsi‎, 05-28-2016 02:10 PM
    • Replies: 5
    • Views: 465
    05-29-2016, 12:33 PM Go to last post
  6. Optimal cut-off from ROC

    Hello, as you know, ROC curve is not depend of the cut-off. But how can I get an "optimal" cut-off from ROC curve? Example: I have a database...

    Started by tradermartin‎, 05-25-2016 04:34 AM
    • Replies: 4
    • Views: 376
    05-26-2016, 02:53 PM Go to last post
  7. Angry 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...

    Started by beatoctane‎, 05-22-2016 06:18 AM
    • Replies: 10
    • Views: 752
    05-26-2016, 02:46 PM Go to last post
  8. 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...

    Started by noetsi‎, 05-26-2016 10:01 AM
    • Replies: 1
    • Views: 257
    05-26-2016, 02:18 PM Go to last post
  9. 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...

    Started by carswa‎, 05-25-2016 04:38 PM
    • Replies: 0
    • Views: 308
    05-25-2016, 04:38 PM Go to last post
  10. 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,...

    Started by JeremyPiven‎, 05-25-2016 01:19 PM
    aggregation, multivariate
    • Replies: 0
    • Views: 237
    05-25-2016, 01:19 PM Go to last post
  11. Logistic regression with repeted measures

    Hi, I'm new in logistic analysis. I have binary outcome (energy...) day 1,2 and 3 (yes/no) for each patient (id). I would like to test whether...

    Started by Aleco‎, 05-25-2016 12:32 PM
    • Replies: 0
    • Views: 217
    05-25-2016, 12:32 PM Go to last post
  12. 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...

    Started by abced‎, 05-25-2016 08:38 AM
    • Replies: 0
    • Views: 221
    05-25-2016, 08:38 AM Go to last post
  13. 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...

    Started by TiUResearch‎, 05-25-2016 07:15 AM
    ols interdependence
    • Replies: 0
    • Views: 188
    05-25-2016, 07:15 AM Go to last post
  14. Question Dimson method - t-statistics on summarised betas ?

    Hi, Currently trying to apply the Dimson method(Dimson 1979. Link provided below), on the market model due to infrequent trading. Our...

    Started by Sigve‎, 05-23-2016 06:30 AM
    • Replies: 0
    • Views: 492
    05-23-2016, 06:30 AM Go to last post
  15. R help with Binary log reg

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

    Started by ling5900‎, 05-22-2016 02:24 PM
    • Replies: 0
    • Views: 267
    05-22-2016, 02:24 PM Go to last post
  16. 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...

    Started by choco21lit‎, 05-21-2016 12:42 PM
    • Replies: 0
    • Views: 268
    05-21-2016, 12:42 PM Go to last post
  17. 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...

    Started by JacobPedersen‎, 05-20-2016 01:41 PM
    blundell-bond, coefficicent, difference gmm, interpreting results, proportion
    • Replies: 0
    • Views: 291
    05-20-2016, 01:41 PM Go to last post
  18. Alcoolimetric Table

    Any idea for estrapolation data for this table? I have read spec gravity= 0.8013 what will the content of Alcool? ...

    Started by crimelist‎, 05-20-2016 10:10 AM
    • Replies: 0
    • Views: 239
    05-20-2016, 10:10 AM Go to last post
  19. 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...

    Started by factorregression‎, 05-18-2016 02:14 PM
    logisitic regression
    • Replies: 0
    • Views: 318
    05-18-2016, 02:14 PM Go to last post
  20. 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...

    Started by agp‎, 05-04-2016 03:55 PM
    • Replies: 6
    • Views: 503
    05-18-2016, 09:08 AM Go to last post
  21. 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...

    Started by abced‎, 05-17-2016 08:19 AM
    • Replies: 0
    • Views: 515
    05-17-2016, 08:19 AM Go to last post
  22. 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...

    Started by Adam35‎, 05-16-2016 07:46 AM
    • Replies: 2
    • Views: 455
    05-16-2016, 09:36 AM Go to last post
  23. Question 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)...

    Started by Pernelle‎, 05-15-2016 10:50 AM
    dummy, regression, unequal sample size
    • Replies: 0
    • Views: 270
    05-15-2016, 10:50 AM Go to last post
  24. 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...

    Started by noetsi‎, 05-14-2016 03:06 PM
    • Replies: 1
    • Views: 342
    05-15-2016, 09:58 AM Go to last post
  25. 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...

    Started by choppedpete‎, 05-12-2016 06:48 AM
    glmer, lme4, lmer, repeated measures
    • Replies: 1
    • Views: 304
    05-12-2016, 02:48 PM Go to last post
  26. 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,...

    Started by pgseye‎, 05-09-2016 07:40 PM
    • Replies: 2
    • Views: 360
    05-10-2016, 04:57 PM Go to last post
  27. dummy regression with polytomous variable

    Hello, I want to perform a linear regression analysis. My DV is continuous (score between 0 and 6), and my predictors are: - one dichotomous...

    Started by Pernelle‎, 05-05-2016 04:03 PM
    • Replies: 1
    • Views: 345
    05-10-2016, 03:35 PM Go to last post
  28. 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...

    Started by gianmarco‎, 05-10-2016 01:47 AM
    • Replies: 2
    • Views: 336
    05-10-2016, 08:42 AM Go to last post
  29. Examining interaction in an exponential (Poisson) model with standard and robust SE's

    Hello dear forum members! For the purpose of my study I am using an exponential Poisson model with fixed-effects specification. In simple: y =...

    Started by kiton‎, 05-09-2016 11:33 AM
    • Replies: 3
    • Views: 366
    05-09-2016, 04:59 PM Go to last post
  30. 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...

    Started by kiton‎, 05-09-2016 10:44 AM
    fit statistics, log likelihood, poisson
    • Replies: 0
    • Views: 218
    05-09-2016, 10:44 AM Go to last post
  31. Using Bonferonni in Multiple Regression

    Hi all, I'm currently working on a data-set involving several continuous independent variables and i'm wondering how the Bonferonni correction can...

    Started by benjamine85‎, 05-09-2016 03:56 AM
    • Replies: 1
    • Views: 263
    05-09-2016, 06:37 AM Go to last post
  32. Multiple regression analysis - Linearity/homoscedasticity

    Hello, I am currently having trouble determining if my predictors show enough linearity to be used in a standard multiple regression analysis, and...

    Started by pussel81‎, 04-27-2016 11:09 AM
    homoscedasticity, linearity, multiple regression
    • Replies: 2
    • Views: 307
    05-08-2016, 09:21 PM Go to last post
  33. Help for simple regression

    My research question is: "Can we say that the number of hours of Internet use increases with Internet purchase?" with the variables: - Use of...

    Started by chamarique‎, 05-07-2016 11:57 AM
    independent variable, regression
    • Replies: 3
    • Views: 451
    05-08-2016, 07:34 PM Go to last post
  34. Imputing Missing Values using Regression

    I have a table of 4 variables where some of the data is missing and I need to impute the missing values, my table is as follows: X1 X2 X3...

    Started by Mid‎, 05-06-2016 04:24 PM
    imputation, regression, study
    • Replies: 3
    • Views: 354
    05-06-2016, 06:21 PM Go to last post
  35. Exclamation Significant two-way interaction, but simple slopes are n.s.

    Hi everyone, I've seen similar questions like mine posted here before, but none of the replies were ever clear enough, so here's my Q. Thanks in...

    Started by tophbeifong‎, 05-06-2016 11:20 AM
    • Replies: 1
    • Views: 315
    05-06-2016, 01:10 PM Go to last post
  36. How to select the Independent Variables for modelling given 100 variable??

    Let's say i have selected my DV and i have 100 variables from which i have to choose my IDVs for the regression model(say multiple regression). ...

    Started by vikash_124124‎, 05-06-2016 05:19 AM
    • Replies: 0
    • Views: 280
    05-06-2016, 05:19 AM Go to last post
  37. Multiparameter fittting - confidence intervals criterion

    I made a multiparameter fittting (7 adjustment parameters, 45 experimental points). I obtained enormous confidence intervals for 95%. There is a...

    Started by James27‎, 05-06-2016 12:12 AM
    • Replies: 0
    • Views: 316
    05-06-2016, 12:12 AM Go to last post
  38. Exclamation Please anyone help due monday

    Hey guys, Im doing a mathematics degree and have this stats subject and honestly have no clue whatsoever on how to do anything in this class. I have...

    Started by disdat11‎, 05-04-2016 11:13 AM
    • Replies: 2
    • Views: 300
    05-05-2016, 03:23 PM Go to last post
  39. normality assumption: data itself, or residuals ?

    I have a question about the normality assumption, in regression, ANOVA, and T-test: The normalization assumption is for the original data and...

    Started by fengyuwuzu‎, 05-03-2016 11:36 PM
    • Replies: 3
    • Views: 1,589
    05-05-2016, 12:21 AM Go to last post
  40. Stepwise Regression Limitations Explanation

    I've recently been working on building a model and have come across a number of different approaches. I'm particularly interested in the limitations...

    Started by Phishypenguin‎, 05-03-2016 05:34 AM
    pvalues, regression, stepwise
    • Replies: 12
    • Views: 655
    05-04-2016, 07:39 PM Go to last post
  41. Do I have a non-linear regression?

    Hello everyone, I want to start by saying that I don't have too much experience working with continuous dependent variables. I have worked more...

    Started by Marvin85‎, 02-26-2016 03:22 PM
    non-linear regression, predict, predicted y terms
    • Replies: 5
    • Views: 755
    05-04-2016, 03:19 AM Go to last post
  42. Quick Mediation Analysis Question

    Hi Everyone, I have a quick question about interpreting a mediation analysis from Hayes' PROCESS macro. After running a mediation analysis, I...

    Started by jricci‎, 04-08-2016 08:03 PM
    mediation, mediation analysis
    • Replies: 2
    • Views: 711
    05-04-2016, 03:01 AM Go to last post
  43. Index & Dummies - Italian Mafia

    Hey. i am working on a paper about the mafia in italy. my equation: Y=beta0 + beta1*MPI + beta2*Controls Y = Response Rate in a given city...

    Started by hurri‎, 05-03-2016 02:11 PM
    • Replies: 0
    • Views: 248
    05-03-2016, 02:11 PM Go to last post
  44. Interpreting Odds Ratio after Weight of evidence transformation

    I am doing a logistic modeling with several continuous variables and binary outcome variable. 1- event 0-non event. I did the initial modeling with...

    Started by bssekar‎, 05-02-2016 09:30 PM
    logistic regression, odds ratio, weight of evidence
    • Replies: 2
    • Views: 279
    05-03-2016, 11:16 AM Go to last post
  45. Combining Two Samples (one w/ intervention and one w/ out intervention)

    I have a local dataset with a continuous predictor and binary outcome. I will use logistic regression to predict the binary outcome with the...

    Started by hlsmith‎, 05-02-2016 04:50 PM
    • Replies: 7
    • Views: 460
    05-02-2016, 11:01 PM Go to last post
  46. testing seemingly unrelated regressions assumptions in R

    Hi there! I have a fitted SUR model and want to test if the assumptions for SUR (not the ordinary linear assumptions, since i've already checke...

    Started by JagarSUR‎, 05-02-2016 02:00 PM
    • Replies: 1
    • Views: 321
    05-02-2016, 03:54 PM Go to last post
  47. Cox Regression - time dependent

    Dear all, I have a question regarding the cox regression. I have conducted a dataset with Top50 Boxoffice Data for the U.S market. It contains...

    Started by martinki‎, 05-02-2016 08:25 AM
    • Replies: 3
    • Views: 357
    05-02-2016, 10:45 AM Go to last post
  48. Types of regression: Article

    Well a page, but I was not sure what to call this :p By no means complete or even close but interesting. There are hundreds of types of...

    Started by noetsi‎, 05-02-2016 09:49 AM
    • Replies: 0
    • Views: 250
    05-02-2016, 09:49 AM Go to last post
  49. 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...

    Started by trinker‎, 04-26-2016 10:51 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 900
    05-01-2016, 10:39 PM Go to last post
  50. Post Linear Regression Interpretation

    Hi there, I am running a Multiple Linear Regression analysis. I have 2 predictor variables (self-worth and self-acceptance) and 1 criterion...

    Started by vanessak93‎, 05-01-2016 09:21 PM
    interpretation, linear regression, multiple regression, psychology statistics, regression
    • Replies: 4
    • Views: 394
    05-01-2016, 09:38 PM Go to last post
  51. Multinomial logit / time-series fixed effects / multivariate regression: Which one?

    As part of a larger study, we have collected a wealth of data on the interactions customers engage in when buying and using a service. ...

    Started by Niklas B.‎, 05-01-2016 06:50 AM
    multinomial logit, multivariate regression, time-series fixed effects
    • Replies: 0
    • Views: 276
    05-01-2016, 06:50 AM Go to last post
  52. Logistic reg w/ ratio as predictor

    Is there anything I need to know when using a ratio as an independent variable in the model. Is it better to use log(ratio) ? Not an easy web...

    Started by hlsmith‎, 04-30-2016 02:34 PM
    • Replies: 1
    • Views: 331
    04-30-2016, 03:22 PM Go to last post
  53. Question [Logistic Analysis] How does SPSS calculate the 0.5 Cut-Point?

    I am interested in determining the classification accuracy of an outcome (binary DV - whether a participant has capacity or not to make a legal...

    Started by szuscak‎, 04-29-2016 06:25 PM
    cut-point, logistic regression
    • Replies: 0
    • Views: 303
    04-29-2016, 06:25 PM Go to last post
  54. Multivariate analysis, canonical correlation

    Hello, I conducted an experiment with 18 subjects who participated in a simulator experiment. Each participant had to perform a task with 6...

    Started by aapje123‎, 04-28-2016 10:08 AM
    • Replies: 0
    • Views: 360
    04-28-2016, 10:08 AM Go to last post
  55. Thumbs down Interpretation of coefficients, dependent variable in (%), independent variable in ln

    Hi, I have a very simple question. I have the following equation. My dependent variable is CRES which is the share of renewables in a country's...

    Started by Rex‎, 04-28-2016 08:07 AM
    dependent var, independent variable, log linear, regression coefficent
    • Replies: 0
    • Views: 283
    04-28-2016, 08:07 AM Go to last post
  56. Problem with replicating a paper

    I'm having some trouble at replicating this paper (text here: http://www.michiganjb.org/issues/52/text52c.pdf) The paper wants to assess the economic...

    Started by Luc.a‎, 04-28-2016 05:29 AM
    • Replies: 0
    • Views: 229
    04-28-2016, 05:29 AM Go to last post
  57. Writing down firth logistic regression equation

    Hi, This is a really simple question that I'm sort of embarrassed I can't answer - how would you write down a firth logistic regression? Now to...

    Started by Wendero‎, 04-25-2016 11:01 PM
    • Replies: 6
    • Views: 404
    04-27-2016, 01:59 PM Go to last post
  58. GLS (Generalized least Squares) STATA

    generalized least squares (GLS) is a technique for estimating the unknown parameters in a linear regression model. GLS (Generalized least Squares)...

    Started by OlhDt_semarang‎, 04-27-2016 06:16 AM
    • Replies: 0
    • Views: 253
    04-27-2016, 06:16 AM Go to last post
  59. Regression with stratified data: What to do?

    Hi, I want to model a bird population in a country via regression analysis (Poisson regression due to count data). In order to optimize the...

    Started by mmercker‎, 04-27-2016 04:39 AM
    regression analysis, stratification, stratified sampling, weights
    • Replies: 0
    • Views: 231
    04-27-2016, 04:39 AM Go to last post
  60. Minimum number of cases for the reference level

    Before I ask this I have the true population so I am not sure this issue even applies :p Is there a minimum number of cases the reference level...

    Started by noetsi‎, 04-25-2016 02:22 PM
    • Replies: 7
    • Views: 474
    04-26-2016, 04:59 PM Go to last post

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