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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Detecting and adjusting for heteroskedasticity in ordinal logistic models

    Does anyone know how to check whether heteroskedasticity is present in an ordinal logistic regression analysis? And, if present, how can it be...

    Started by KV Weyde‎, 06-09-2016 03:13 AM
    • Replies: 0
    • Views: 616
    06-09-2016, 03:13 AM Go to last post
  2. Confidence intervals comparison for linear and quadratic slopes?

    Hello, I am using regression analyses to evaluate changes in several different cognitive functions across the life span. In most cases, the...

    Started by IoMar‎, 06-08-2016 09:09 PM
    • Replies: 0
    • Views: 497
    06-08-2016, 09:09 PM Go to last post
  3. Logistic Regression with interactions and contrasts

    Hello All, I need some advice for choosing the correct model. I have 3 binary variables: Risk (0 = the person doesn't take financial risks, 1 =...

    Started by Yankel‎, 06-07-2016 05:55 AM
    • Replies: 5
    • Views: 1,249
    06-08-2016, 09:37 AM Go to last post
  4. SQReg demonstration

    Hello everyone, i need help with this demonstration: SQReg = B1^2*Sxx Someone can help?

    Started by Calion‎, 06-05-2016 11:35 AM
    • Replies: 1
    • Views: 700
    06-06-2016, 12:22 PM Go to last post
  5. Constant in linear regression

    Hey guys, Need help in Linear regression: I have a dataset of 70 tumors that during resection we used an electric measurement to estimate a...

    Started by XPeriment‎, 06-05-2016 10:47 PM
    • Replies: 0
    • Views: 1,028
    06-05-2016, 10:47 PM Go to last post
  6. Interpretation of continuous interaction term

    Hi all, I have a question regarding the interpretation of a squared interaction term in the following model: Y=β0+β1X+ β1X^2 + β2Z+ β3 X^2Z ...

    Started by Rene Jansen‎, 06-05-2016 08:13 AM
    continuous moderator, interaction effect, interaction term
    • Replies: 0
    • Views: 756
    06-05-2016, 08:13 AM Go to last post
  7. Question Need help to choose right statistical analysis

    Dear all, I have one dependent variable (Y) and 3 independent variables (X1, X2, X3). All dependent and independent variables are continuous. ...

    Started by tony.adib1984‎, 06-05-2016 03:30 AM
    ancova, anova
    • Replies: 0
    • Views: 448
    06-05-2016, 03:30 AM Go to last post
  8. Interpreting dummy variables.

    I did not create the following variables, the state I worked for did...They have one variable coded W if you are white 0 otherwise. A second variable...

    Started by noetsi‎, 06-04-2016 05:59 PM
    • Replies: 0
    • Views: 722
    06-04-2016, 05:59 PM Go to last post
  9. Beta weights and correlations

    Dear all, I have used regression to explain a dependent variable with a number of independent variables. I expected independent variables which...

    Started by Anthony_1000‎, 06-04-2016 04:05 AM
    beta weights, correlations
    • Replies: 0
    • Views: 501
    06-04-2016, 04:05 AM Go to last post
  10. Logistic regression - basics

    Dearest stat colleagues, I have some basic questions regarding logistic regression that I hope you can help me out with. I’m running a simple...

    Started by Jeff135‎, 05-31-2016 01:39 PM
    • Replies: 4
    • Views: 1,173
    06-01-2016, 06:48 PM Go to last post
  11. How to handle poor reporting unstandardised\standardized coefficients?

    Hi, I have several times problem how to distinguish what is reported in clinical journals in relation to regression analysis. Frequently authors...

    Started by Vlajkony‎, 06-01-2016 05:29 PM
    • Replies: 1
    • Views: 572
    06-01-2016, 05:56 PM Go to last post
  12. Is this Multicollinearity?

    Hi guys, im relatively new in this forum. I have a question, i am using multiple regression analysis for my thesis. The result shows the P-value is...

    Started by LizBeth‎, 05-29-2016 11:04 PM
    • Replies: 8
    • Views: 778
    06-01-2016, 07:44 AM Go to last post
  13. 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 08:52 AM
    fixed regressor, linear regression, stochastic regressor
    • Replies: 3
    • Views: 851
    05-30-2016, 09:16 PM Go to last post
  14. 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 04:49 PM
    mixed models, stata, time-varying covariate
    • Replies: 0
    • Views: 1,434
    05-30-2016, 04:49 PM Go to last post
  15. 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 02:52 PM
    • Replies: 0
    • Views: 701
    05-30-2016, 02:52 PM Go to last post
  16. 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 08:36 PM
    • Replies: 3
    • Views: 668
    05-30-2016, 07:05 AM Go to last post
  17. 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 01:10 PM
    • Replies: 5
    • Views: 886
    05-29-2016, 11:33 AM Go to last post
  18. 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 03:34 AM
    • Replies: 4
    • Views: 657
    05-26-2016, 01:53 PM Go to last post
  19. 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 05:18 AM
    • Replies: 10
    • Views: 1,512
    05-26-2016, 01:46 PM Go to last post
  20. 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 09:01 AM
    • Replies: 1
    • Views: 673
    05-26-2016, 01:18 PM Go to last post
  21. 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 03:38 PM
    • Replies: 0
    • Views: 1,085
    05-25-2016, 03:38 PM Go to last post
  22. 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 12:19 PM
    aggregation, multivariate
    • Replies: 0
    • Views: 431
    05-25-2016, 12:19 PM Go to last post
  23. 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 11:32 AM
    • Replies: 0
    • Views: 377
    05-25-2016, 11:32 AM Go to last post
  24. 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 07:38 AM
    • Replies: 0
    • Views: 422
    05-25-2016, 07:38 AM Go to last post
  25. 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 06:15 AM
    ols interdependence
    • Replies: 0
    • Views: 462
    05-25-2016, 06:15 AM Go to last post
  26. 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 05:30 AM
    • Replies: 0
    • Views: 1,556
    05-23-2016, 05:30 AM Go to last post
  27. R help with Binary log reg

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

    Started by ling5900‎, 05-22-2016 01:24 PM
    • Replies: 0
    • Views: 577
    05-22-2016, 01:24 PM Go to last post
  28. 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 11:42 AM
    • Replies: 0
    • Views: 682
    05-21-2016, 11:42 AM Go to last post
  29. 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 12:41 PM
    blundell-bond, coefficicent, difference gmm, interpreting results, proportion
    • Replies: 0
    • Views: 572
    05-20-2016, 12:41 PM Go to last post
  30. 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 09:10 AM
    • Replies: 0
    • Views: 631
    05-20-2016, 09:10 AM Go to last post
  31. 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 01:14 PM
    logisitic regression
    • Replies: 0
    • Views: 470
    05-18-2016, 01:14 PM Go to last post
  32. 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 02:55 PM
    • Replies: 6
    • Views: 754
    05-18-2016, 08:08 AM Go to last post
  33. 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 07:19 AM
    • Replies: 0
    • Views: 990
    05-17-2016, 07:19 AM Go to last post
  34. 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 06:46 AM
    • Replies: 2
    • Views: 835
    05-16-2016, 08:36 AM Go to last post
  35. 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 09:50 AM
    dummy, regression, unequal sample size
    • Replies: 0
    • Views: 613
    05-15-2016, 09:50 AM Go to last post
  36. 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 02:06 PM
    • Replies: 1
    • Views: 741
    05-15-2016, 08:58 AM Go to last post
  37. 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 05:48 AM
    glmer, lme4, lmer, repeated measures
    • Replies: 1
    • Views: 650
    05-12-2016, 01:48 PM Go to last post
  38. 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 06:40 PM
    • Replies: 2
    • Views: 796
    05-10-2016, 03:57 PM Go to last post
  39. 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 03:03 PM
    • Replies: 1
    • Views: 759
    05-10-2016, 02:35 PM Go to last post
  40. 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 12:47 AM
    • Replies: 2
    • Views: 485
    05-10-2016, 07:42 AM Go to last post
  41. 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 10:33 AM
    • Replies: 3
    • Views: 809
    05-09-2016, 03:59 PM Go to last post
  42. 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 09:44 AM
    fit statistics, log likelihood, poisson
    • Replies: 0
    • Views: 551
    05-09-2016, 09:44 AM Go to last post
  43. 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 02:56 AM
    • Replies: 1
    • Views: 492
    05-09-2016, 05:37 AM Go to last post
  44. 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 10:09 AM
    homoscedasticity, linearity, multiple regression
    • Replies: 2
    • Views: 962
    05-08-2016, 08:21 PM Go to last post
  45. 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 10:57 AM
    independent variable, regression
    • Replies: 3
    • Views: 870
    05-08-2016, 06:34 PM Go to last post
  46. 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 03:24 PM
    imputation, regression, study
    • Replies: 3
    • Views: 894
    05-06-2016, 05:21 PM Go to last post
  47. 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 10:20 AM
    • Replies: 1
    • Views: 538
    05-06-2016, 12:10 PM Go to last post
  48. 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 04:19 AM
    • Replies: 0
    • Views: 606
    05-06-2016, 04:19 AM Go to last post
  49. 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, 05-05-2016 11:12 PM
    • Replies: 0
    • Views: 669
    05-05-2016, 11:12 PM Go to last post
  50. 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 10:13 AM
    • Replies: 2
    • Views: 653
    05-05-2016, 02:23 PM Go to last post
  51. 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 10:36 PM
    • Replies: 3
    • Views: 1,835
    05-04-2016, 11:21 PM Go to last post
  52. 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 04:34 AM
    pvalues, regression, stepwise
    • Replies: 12
    • Views: 1,013
    05-04-2016, 06:39 PM Go to last post
  53. 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: 1,226
    05-04-2016, 02:19 AM Go to last post
  54. 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 07:03 PM
    mediation, mediation analysis
    • Replies: 2
    • Views: 1,219
    05-04-2016, 02:01 AM Go to last post
  55. 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 01:11 PM
    • Replies: 0
    • Views: 592
    05-03-2016, 01:11 PM Go to last post
  56. 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 08:30 PM
    logistic regression, odds ratio, weight of evidence
    • Replies: 2
    • Views: 561
    05-03-2016, 10:16 AM Go to last post
  57. 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 03:50 PM
    • Replies: 7
    • Views: 1,086
    05-02-2016, 10:01 PM Go to last post
  58. 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 01:00 PM
    • Replies: 1
    • Views: 644
    05-02-2016, 02:54 PM Go to last post
  59. 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 07:25 AM
    • Replies: 3
    • Views: 941
    05-02-2016, 09:45 AM Go to last post
  60. 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 08:49 AM
    • Replies: 0
    • Views: 561
    05-02-2016, 08:49 AM Go to last post

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