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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Include or Exclude a Variable in Regression ?

    Dear all, Dr Timothy Z Keith advised that a new variable should not be included unless it is a common cause (associated with both dependent...

    Started by martinl‎, Today 07:42 AM
    • Replies: 1
    • Views: 26
    Today, 08:30 AM Go to last post
  2. Question Linear regression with only these data σx/σy =1.2

    I have to demonstrate a linear relation between two variables X and Y using these data: σx/σy = 1.2. :mad: Small size effect required. Test...

    Started by angbee‎, Yesterday 11:02 AM
    • Replies: 0
    • Views: 67
    Yesterday, 11:02 AM Go to last post
  3. Forward selection of non significant variables

    Hi, In SAS Enterprise Miner, I trained a logistic regression with forward selection and AIC criteria. I grouped rare levels for categorical...

    Started by MarcoVA‎, 10-21-2017 04:37 PM
    forward, information criterion, logisitic regression, statistic test, variable selection
    • Replies: 2
    • Views: 80
    10-21-2017, 09:21 PM Go to last post
  4. Multiple regression multigroup analysis in Amos

    I am testing the hypothesised effect in a model using SEM A -> B between two groups. The results of the standardised path coefficients (SPC) are...

    Started by Hansi‎, 10-21-2017 06:25 PM
    analysis, group size, multigroup, sem
    • Replies: 0
    • Views: 60
    10-21-2017, 06:25 PM Go to last post
  5. precision assessment of an experimental method

    Hi everyone, I have a very basic knowledge of statistics so apologies if the question is not formulated in appropriate terms. I really hope to get...

    Started by HannaMa‎, 10-21-2017 04:38 PM
    anova, assessment, coefficient of variation, precision
    • Replies: 0
    • Views: 47
    10-21-2017, 04:38 PM Go to last post
  6. IV regression help

    Hello everyone, Im confused about endogeneity and how to approach this problem in a case of one equation and multiple equations that are jointly...

    Started by Regressionhelp‎, 10-06-2017 02:26 AM
    iv; iv regression
    • Replies: 4
    • Views: 514
    10-19-2017, 09:10 AM Go to last post
  7. Converting a continuous variable into a categorical variable (low, medium, high)

    I have a continuous dependent variable (scores on an exam) and a number of predictor variables that I'd like to use in a regression analysis, such as...

    Started by tess2‎, 10-17-2017 12:08 AM
    categorical, percentiles, regression
    • Replies: 4
    • Views: 159
    10-17-2017, 10:43 AM Go to last post
  8. Ordinal logistic regression - How to get a single scoring function?

    Hi all, I'm running ordinal logistic regressions, with adjacent-category logits. The dependent variable has four ordered levels. So I have 3...

    Started by atrolle‎, 10-17-2017 04:33 AM
    adjacent-category logits, aggregation, linear predictors, ordinal logistic reg, single scoring function
    • Replies: 0
    • Views: 78
    10-17-2017, 04:33 AM Go to last post
  9. Question Controlling for time

    Hello, Thank-you for taking the time to read this post. I have managed to get myself very confused about what is (hopefully) quite a simple...

    Started by CathyK‎, 10-16-2017 08:15 AM
    control variable, logistic regression
    • Replies: 0
    • Views: 62
    10-16-2017, 08:15 AM Go to last post
  10. Simple Regression

    The manager of Colonial Furniture has been reviewing weekly advertising expenditures. During the past 6 months, all advertisements for the store...

    Started by vernonicamexie‎, 10-10-2017 01:32 PM
    • Replies: 0
    • Views: 126
    10-10-2017, 01:32 PM Go to last post
  11. Hierarchical Linear Modeling (HLM) Explanation

    I sought help actually doing an HLM a few weeks ago and found the assistance very helpful. Now, I'm curious about more of the actual meaning of...

    Started by Weibull‎, 10-09-2017 07:32 AM
    • Replies: 1
    • Views: 92
    10-09-2017, 09:07 AM Go to last post
  12. Stationarity and White noise

    Hi all, I'm just beginning to learn about time series analysis for my final year project at uni and I am confused about stationarity. A time series...

    Started by zeke512‎, 10-02-2017 10:57 AM
    • Replies: 4
    • Views: 223
    10-03-2017, 04:53 AM Go to last post
  13. Multiple linear regression in cross-country analysis with small sample size

    Hello, While conducting small student’s research project I’ve faced a little problem. I’m using aggregated country data (not in individual, but...

    Started by AloisDusek‎, 10-01-2017 07:10 AM
    • Replies: 0
    • Views: 192
    10-01-2017, 07:10 AM Go to last post
  14. Hierarchical Linear Modeling (HLM) Assistance

    Sorry if this gets posted twice (it doesn't look like it has posted the first time as of now). I asked a question about fixed vs. random effects...

    Started by Weibull‎, 09-27-2017 10:26 AM
    • Replies: 4
    • Views: 262
    09-28-2017, 04:40 AM Go to last post
  15. Logit Transformation: Interpreting the Coefficients

    Hi all, I'm currently doing an empirical project in econometrics. I examine the effect of globalisation and some other control variables on...

    Started by Markst‎, 09-24-2017 08:57 AM
    • Replies: 2
    • Views: 207
    09-26-2017, 08:55 AM Go to last post
  16. combining error terms for two dissimilar regressions

    I have a linear regression for Y on X, and a power regression for Z on Y, each having associated error. (the Y values are different (independent) in...

    Started by George Kraemer‎, 09-21-2017 11:32 AM
    • Replies: 13
    • Views: 473
    09-25-2017, 02:36 PM Go to last post
  17. Fixed effects / clustered standard error in multi-level data

    Hi everyone :) I'm analyzing the effect of political corruption on the bid-ask spread of US political entities, namely my data set consists of...

    Started by Physiokrat‎, 09-25-2017 08:22 AM
    • Replies: 0
    • Views: 137
    09-25-2017, 08:22 AM Go to last post
  18. Estimating impact of Predictor

    Hi, I have a simple regression with 24-36 months of data, let's say of Sales which is the dependant variable and % spend on promotions in that...

    Started by confusedguy15‎, 09-22-2017 07:50 AM
    • Replies: 3
    • Views: 160
    09-22-2017, 08:59 AM Go to last post
  19. Spend against views/day. Include days of no spend?

    Hi everyone, just looking at doing some simple linear regression and I've got views on an article. Occasionally we choose to spend a bit of money...

    Started by Edorian‎, 09-20-2017 11:41 PM
    • Replies: 0
    • Views: 150
    09-20-2017, 11:41 PM Go to last post
  20. Residual Modelling and Generating Scenarios for variables

    newbie here with a trivial question. i am trying to create scenarios on a set of macro variables. i started with creating a bayesian VAR model on...

    Started by eemrun‎, 09-20-2017 09:33 PM
    forecast, forecast error, var
    • Replies: 0
    • Views: 131
    09-20-2017, 09:33 PM Go to last post
  21. OLS vs solving a system of linear equaions

    If i want to solve y=Xb, where y is a vector of observations and X a matrix of independent variables i could use ordinary least squares to estimate...

    Started by Prometheus‎, 09-14-2017 07:49 AM
    • Replies: 11
    • Views: 502
    09-20-2017, 08:06 AM Go to last post
  22. Post two sided multivariate

    Hi, I have a question, what will I do with this? In univariate analysis, if the population standard deviation σ is known, the appropriate...

    Started by Sonyver‎, 09-19-2017 03:25 AM
    • Replies: 0
    • Views: 131
    09-19-2017, 03:25 AM Go to last post
  23. ANOVA with multiple imputed Data

    Hello :) I used multiple imputation on my data to get a complete data set. I want to do a ANOVA now. Does anybody know how to do that correctly? ...

    Started by froop91‎, 09-06-2017 04:37 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 1,004
    09-15-2017, 04:15 AM Go to last post
  24. Logistic regression - a very simple question

    I have a question regarding the likelihood. I am trying to assess the likelihood of being in a family history positive group (FH+) on alcoholism (0...

    Started by yadayada‎, 07-26-2017 05:54 PM
    • Replies: 13
    • Views: 808
    09-13-2017, 06:03 PM Go to last post
  25. Repeated Measures - moderation / two outcomes issue

    Hey folks! By what procedure can I test whether the association between two dependent variables D1 and D2 changes as a function of within-subject...

    Started by Martin Marko‎, 09-13-2017 12:03 PM
    • Replies: 0
    • Views: 164
    09-13-2017, 12:03 PM Go to last post
  26. 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: 222
    09-08-2017, 04:50 AM Go to last post
  27. backwards stepwise multiple regression, collinearity. Rejected paper.

    Hi helpful people! My research paper was recently rejected and some of the feedback I received was in relation to the statistical tests done/not...

    Started by potatopatch‎, 09-04-2017 05:33 PM
    collinearity, stepwise regression
    • Replies: 13
    • Views: 558
    09-06-2017, 05:53 PM Go to last post
  28. linear regression - coefficients too high (data in % as an alternative?)

    Hi everyone, I am new to statistics and I have to run 3 separate simple linear regressions (I averaged the data from 2003-2015 in order to run a...

    Started by Francesca-M‎, 09-05-2017 03:13 AM
    • Replies: 0
    • Views: 168
    09-05-2017, 03:13 AM Go to last post
  29. Firth regression and AIC-based model selection

    Dear all, when using Firth's bias reduction method (Firth 1993) to fit logistic regressions, is it possible (sensible) to compare models using AIC? ...

    Started by Luke‎, 09-01-2017 08:04 AM
    aic, firth regression
    • Replies: 4
    • Views: 371
    09-01-2017, 03:41 PM Go to last post
  30. Question on Impact of Independent Variable Interpretation

    Hi, Suppose i have a normal linear regression construct, like Sales = Intercept + M1*X1 + M2*X2 + M3*X3 Suppose X1,X2,X3 are the...

    Started by kaos1511‎, 09-01-2017 01:24 PM
    regression, regression analysis, regression coefficent
    • Replies: 3
    • Views: 270
    09-01-2017, 03:30 PM Go to last post
  31. Fixed vs. Random Effects

    I'm wondering if someone could help me to correctly identify whether certain variables should be considered fixed or random effects. Just as...

    Started by Weibull‎, 08-28-2017 09:38 AM
    difference, effects, fixed, random
    • Replies: 6
    • Views: 387
    08-29-2017, 04:43 AM Go to last post
  32. [Linear Regression] Regression with aggregated or separated years?

    Hello to everyone! :wave: I should do some regressions but i've an important and simple question... my dataset have this structure: ...

    Started by andre94‎, 08-25-2017 09:32 AM
    aggregation, linear regression, regression analysis
    • Replies: 4
    • Views: 323
    08-25-2017, 12:00 PM Go to last post
  33. Interaction effects regression wiith dummy variables

    Hello everyone, I am doing an analysis about the export diversification effect during the financial crisis. I have my dependent variable as log...

    Started by doug_aguilar‎, 08-24-2017 07:34 AM
    dummy variables, estimating equations, multicollinearity, regression analysis
    • Replies: 5
    • Views: 343
    08-25-2017, 09:19 AM Go to last post
  34. How to handle dummy variable with fraction as possible values

    Hello , I am working on a data with a dummy variable values not just 0 or 1. It has fractions as values which denote the number of month within a...

    Started by samisan‎, 08-12-2017 04:42 PM
    • Replies: 5
    • Views: 506
    08-13-2017, 05:27 AM Go to last post
  35. Interaction / Moderation effect linear regression

    Hi, I have a question regarding a moderation effect with linear regression. I have hypothesized for a significant main effect and another...

    Started by diederikvanduuren‎, 08-01-2017 03:34 PM
    • Replies: 6
    • Views: 577
    08-12-2017, 11:34 AM Go to last post
  36. Determine Confounding using Multivariate analysis

    After we adjusted for confounders in the Multivariate analysis, How do we determine that if the variable is confounding or not? I read somewhere...

    Started by sandyzman‎, 08-11-2017 01:49 PM
    • Replies: 1
    • Views: 230
    08-11-2017, 02:04 PM Go to last post
  37. high correlation among interaction terms

    Y= alpha+ b1*x1 + b2*x2 + b3* x3 +b4*x4 + b5*dummy1*x1+b6*dummy1*x2 + b7*dummy1*x3 +b8*dummy1*x4 I run the correlation between all the regression...

    Started by 12345678‎, 08-10-2017 06:11 AM
    interaction, multicolinearity
    • Replies: 0
    • Views: 263
    08-10-2017, 06:11 AM Go to last post
  38. Relative impact of regressors on Y.

    A question I get asked a lot is, if we have these three predictors of Y, which of the 3 has the most, next most and least impact. I have tried...

    Started by noetsi‎, 01-29-2017 05:42 PM
    • Replies: 12
    • Views: 3,388
    08-07-2017, 07:31 PM Go to last post
  39. Correlation among a paired multiple vairable for a special case

    Hi all, I've run into a stats problem that I can't figure out. I have a pair of linked variables (x,y) that I want to correlate with a third...

    Started by willct‎, 08-06-2017 07:22 AM
    • Replies: 1
    • Views: 275
    08-07-2017, 06:41 PM Go to last post
  40. How to report Multiple Regression Results

    Dear Forum, for my thesis I want to investigate the relationship between certain health behaviors (e.g. eating behavior) and participants...

    Started by lisannceline‎, 08-07-2017 09:22 AM
    • Replies: 0
    • Views: 142
    08-07-2017, 09:22 AM Go to last post
  41. Model for regression with multiple binomial predictors?

    Hi everyone, I was wondering what model to pick when all the predictors are binomial distributions. I have a website that's being visited...

    Started by Junes‎, 08-02-2017 03:47 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 760
    08-04-2017, 04:18 PM Go to last post
  42. Odds ratios for multilevel categorical variable

    Hi, I have a categorical variable with three levels that represent disease severity (0=no disesase, 1=mild, 2=severe disease) and I have put it...

    Started by Markica85‎, 08-04-2017 10:52 AM
    • Replies: 3
    • Views: 275
    08-04-2017, 01:31 PM Go to last post
  43. matrix iv and dv

    hi all The independent variable i got is a 52x16 matrix The dependent variable i got is also a 52x16 martix (This is one variable) what kind...

    Started by jackfrom14‎, 08-01-2017 03:22 AM
    • Replies: 0
    • Views: 245
    08-01-2017, 03:22 AM Go to last post
  44. Regression or regression alternatives for data missing not at random

    I am analyzing the results of a satisfaction survey. The research question or goal is to determine whether or not (dis-)satisfaction with...

    Started by appendix‎, 07-29-2017 09:08 PM
    • Replies: 4
    • Views: 320
    07-31-2017, 02:43 PM Go to last post
  45. Easy Bayesian Statistics

    Well the thread title was to get your attention. About a month ago I attended a workshop on Bayesian statistics. It introduced the basic principles...

    Started by hlsmith‎, 07-29-2017 11:41 AM
    • Replies: 1
    • Views: 296
    07-31-2017, 08:49 AM Go to last post
  46. Looking for references on Passing-Bablok curve fitting.

    Hi, I am computer programmer and I need to implement the Passing-Bablok method in one application I have. Yet, I am a little stuck since I don't...

    Started by gmmo‎, 07-28-2017 06:33 PM
    passing-bablok method
    • Replies: 0
    • Views: 248
    07-28-2017, 06:33 PM Go to last post
  47. Coefficient sign varys over the distribution of the dependent variable

    Hi, Lets say I am estimating a linear regression with Y as a continuous DV and X as a binary IV. Based on theoretical reasons I am assuming that...

    Started by xs0982‎, 07-21-2017 08:53 AM
    • Replies: 1
    • Views: 382
    07-21-2017, 11:16 AM Go to last post
  48. Modeling portfolio using multiple regressions

    Hi All, I'm wondering about the viability of this task. I'm looking to form something similar to an investment portfolio, which aggregates...

    Started by JoeJackson12‎, 07-17-2017 07:05 AM
    multiple regression, portfolio, regression analysis, securities
    • Replies: 2
    • Views: 455
    07-21-2017, 07:21 AM Go to last post
  49. Negative Binomial Regression and Type I Errors

    Hi, I've completed three test of negative binomial regression. One test had 14 independent variables, and the other two had 7 independent...

    Started by Username123‎, 07-20-2017 07:34 AM
    • Replies: 2
    • Views: 373
    07-21-2017, 03:05 AM Go to last post
  50. Calibration set for PLS regression

    Hello everyone, New to this forum and kind of wondering why I hadn't thought to search for one before tonight... I hope a light at the end of the...

    Started by lonobean‎, 07-20-2017 06:40 AM
    calibration, pls, sample, spectroscopy, training
    • Replies: 0
    • Views: 277
    07-20-2017, 06:40 AM Go to last post
  51. Logistic Regression - predicted probabilities opposite to actual percentages

    Hi! I've asked this question elsewhere but haven't yet got a response that makes much sense to me... I have conducted a logistic regression in...

    Started by DrJay‎, 07-13-2017 08:52 AM
    • Replies: 6
    • Views: 477
    07-17-2017, 03:40 AM Go to last post
  52. help with mediation analysis

    hey- i just conducted a study with 2 IVs and 1 DV, i found statistically signification relationships between IV1 and the DV and IV2 and the DV. I...

    Started by donthatekate‎, 07-16-2017 06:37 PM
    • Replies: 0
    • Views: 373
    07-16-2017, 06:37 PM Go to last post
  53. Checking assumptions regression categorical predictors

    Hi, I am doing a regression analysis on review star rating of VR headsets as a dependent variable and 14 attribute dummies. Each dummy is an...

    Started by diederikvanduuren‎, 07-10-2017 12:24 PM
    • Replies: 2
    • Views: 733
    07-10-2017, 06:56 PM Go to last post
  54. Importance of vars in linear regression (R)

    I have a question that is and R question and a statistical question: I am analysing sales of a retailer. These sales are related to some vars:...

    Started by juanvg1972‎, 07-04-2017 10:12 AM
    caret, important predictors, linear regression, r language, statistic
    • Replies: 2
    • Views: 587
    07-10-2017, 06:42 PM Go to last post
  55. Regression against the mean

    Hi, the data behaves in a certain way. It has the tendency to regress to the mean as well as is correlated to another factor Y. Is it correct to do a...

    Started by lawlsh‎, 07-06-2017 08:51 PM
    • Replies: 1
    • Views: 496
    07-07-2017, 01:42 AM Go to last post
  56. Lightbulb Log-transforming Only the Dependent Variable

    For the regression: ln(gestation) = 5.28 + 0.0104×Birthweight For the birthweight and gestation data, Minitab tells us that coefficient of...

    Started by hymth‎, 07-03-2017 09:50 PM
    log, log transformation, log-linear
    • Replies: 8
    • Views: 635
    07-06-2017, 03:25 AM Go to last post
  57. How do I run a moderator analysis within zero-inflated negative binomial(ZINB) reg?

    How do I run a moderator analysis within zero-inflated negative binomial(ZINB) regression? I do have independent variables (Social Network...

    Started by SEWON‎, 07-01-2017 11:22 PM
    moderated regression, zero-inflation
    • Replies: 0
    • Views: 295
    07-01-2017, 11:22 PM Go to last post
  58. Reporting Dummy Variables and Determining Significance

    Hi all, I was just wondering, how does a person determine the significance of a categorical variable in a hierarchical regression model if one...

    Started by Aegislash‎, 06-27-2017 12:11 PM
    control, dummy variables, hierarchical regression, significance, step 2
    • Replies: 1
    • Views: 410
    06-27-2017, 12:46 PM Go to last post
  59. between-subject variation PROC MIXED in SAS

    I haven't used mixed models for long and can't remember much about it. So here's a silly question. Suppose below is my program to model a repeated...

    Started by sunny3333‎, 06-21-2017 12:50 PM
    • Replies: 2
    • Views: 590
    06-26-2017, 11:20 AM Go to last post
  60. Using a dummy variable to model threshold effects

    Hi All, I'm new to this thread and very green/inexperienced in using regressions. I'm trying to model threshold effects in a time series analysis -...

    Started by JoeJackson12‎, 06-26-2017 08:28 AM
    dummy variable, threshold, time series
    • Replies: 0
    • Views: 406
    06-26-2017, 08:28 AM Go to last post

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