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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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: 324
    Today, 08:06 AM Go to last post
  2. 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, Yesterday 03:25 AM
    • Replies: 0
    • Views: 60
    Yesterday, 03:25 AM Go to last post
  3. 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: 719
    09-15-2017, 04:15 AM Go to last post
  4. 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: 626
    09-13-2017, 06:03 PM Go to last post
  5. 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: 101
    09-13-2017, 12:03 PM Go to last post
  6. 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: 141
    09-08-2017, 04:50 AM Go to last post
  7. 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: 420
    09-06-2017, 05:53 PM Go to last post
  8. 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: 117
    09-05-2017, 03:13 AM Go to last post
  9. 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: 246
    09-01-2017, 03:41 PM Go to last post
  10. 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: 204
    09-01-2017, 03:30 PM Go to last post
  11. 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: 263
    08-29-2017, 04:43 AM Go to last post
  12. [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: 264
    08-25-2017, 12:00 PM Go to last post
  13. 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: 274
    08-25-2017, 09:19 AM Go to last post
  14. 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: 431
    08-13-2017, 05:27 AM Go to last post
  15. 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: 433
    08-12-2017, 11:34 AM Go to last post
  16. 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: 168
    08-11-2017, 02:04 PM Go to last post
  17. 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: 176
    08-10-2017, 06:11 AM Go to last post
  18. 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: 2,897
    08-07-2017, 07:31 PM Go to last post
  19. 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: 203
    08-07-2017, 06:41 PM Go to last post
  20. 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: 95
    08-07-2017, 09:22 AM Go to last post
  21. 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: 608
    08-04-2017, 04:18 PM Go to last post
  22. 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: 217
    08-04-2017, 01:31 PM Go to last post
  23. 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: 186
    08-01-2017, 03:22 AM Go to last post
  24. 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: 268
    07-31-2017, 02:43 PM Go to last post
  25. 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: 242
    07-31-2017, 08:49 AM Go to last post
  26. 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: 181
    07-28-2017, 06:33 PM Go to last post
  27. 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: 332
    07-21-2017, 11:16 AM Go to last post
  28. 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: 362
    07-21-2017, 07:21 AM Go to last post
  29. 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: 292
    07-21-2017, 03:05 AM Go to last post
  30. 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: 216
    07-20-2017, 06:40 AM Go to last post
  31. 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: 405
    07-17-2017, 03:40 AM Go to last post
  32. 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: 249
    07-16-2017, 06:37 PM Go to last post
  33. 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: 466
    07-10-2017, 06:56 PM Go to last post
  34. 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: 422
    07-10-2017, 06:42 PM Go to last post
  35. 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: 435
    07-07-2017, 01:42 AM Go to last post
  36. 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: 498
    07-06-2017, 03:25 AM Go to last post
  37. 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: 251
    07-01-2017, 11:22 PM Go to last post
  38. 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: 347
    06-27-2017, 12:46 PM Go to last post
  39. 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: 440
    06-26-2017, 11:20 AM Go to last post
  40. 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: 283
    06-26-2017, 08:28 AM Go to last post
  41. Question HLM - non-linear IV and placement of individual characteristics in the model

    Hi all! I am working on my dissertation and run across a couple of questions when structuring HLM model. The data looks as follows: I conducted an...

    Started by doroshishka‎, 06-22-2017 05:04 PM
    categorical variables, hlm, variable in model
    • Replies: 0
    • Views: 303
    06-22-2017, 05:04 PM Go to last post
  42. Exclamation How to use Regression to solve this task

    Hi, I am new to statistics and in uni we use SPSS to solve statistical problems. I have difficulty to orientate how to solve a problem with...

    Started by Kris_stat‎, 06-17-2017 09:08 AM
    • Replies: 1
    • Views: 479
    06-17-2017, 09:50 AM Go to last post
  43. Unbalanced ANCOVA

    Hi all, I have data in this format: 2 independent variables: 1 factor with 3 levels (3 different locations) ...

    Started by smed‎, 06-12-2017 10:03 AM
    • Replies: 0
    • Views: 537
    06-12-2017, 10:03 AM Go to last post
  44. Distribution of fixed effects

    Hi all, Let me shortly introduce my research: I am looking at whether companies outperform each other in investments. To do this I observe them at...

    Started by daniel_smit‎, 06-09-2017 05:07 AM
    distribution, fixed effect model, normal distributed, panel data
    • Replies: 3
    • Views: 687
    06-09-2017, 11:56 AM Go to last post
  45. Multiple rows per respondent

    Hey everyone, I have 6 rows of data per respondent and I'd like to perform a linear regression analysis. I'm just not sure about 1 thing. My...

    Started by Giorgi‎, 06-08-2017 02:47 PM
    • Replies: 2
    • Views: 538
    06-09-2017, 05:29 AM Go to last post
  46. Compare regression coefficients of two settings with similar samples

    Dear Statisticians, For my thesis I am currently examining whether the accounting principles have an influence on the relation between having a...

    Started by Daniel_W‎, 06-09-2017 03:32 AM
    • Replies: 0
    • Views: 284
    06-09-2017, 03:32 AM Go to last post
  47. Comparing effect sizes of two longitudinal linear relationships

    Is there a way to determine if one longitudinal linear relationship is significantly stronger than another? I was planning on using regression...

    Started by dbt_healthpsych‎, 06-08-2017 12:51 PM
    effect sizes, longitudinal data, moderated multiple regres
    • Replies: 2
    • Views: 310
    06-08-2017, 10:16 PM Go to last post
  48. Trichotomizing an Independent Variable

    In SPSS, how does one go about trichotomizing an independent variable such that about 33% are in each of the three groups?

    Started by langood‎, 06-08-2017 11:54 AM
    linear regression, multiple regression, trichotomize
    • Replies: 4
    • Views: 463
    06-08-2017, 06:19 PM Go to last post
  49. Regression: Multiple Independent Variables by Year

    Hello All! First time here and working in SPSS. I'm having a difficult time running a regression using test score proficiency as my dependent...

    Started by BF_Grad‎, 06-06-2017 05:42 PM
    • Replies: 1
    • Views: 562
    06-07-2017, 02:33 PM Go to last post
  50. When are residual plots ok?

    In general you want a random scatter in the residuals. You want no obvious patterns. I know that is the theory. But what does that really mean in...

    Started by noetsi‎, 06-05-2017 06:46 PM
    • Replies: 2
    • Views: 594
    06-05-2017, 09:44 PM Go to last post
  51. Regression Analysis

    Hey everyone, I have a regression model where I have as a dependent variable daily stock prices over 365 days for multiple stocks. I am...

    Started by Tartaglia‎, 06-05-2017 02:44 PM
    • Replies: 2
    • Views: 513
    06-05-2017, 03:35 PM Go to last post
  52. Multiple regression V.S. Bivariate regression

    Hi there, I'm interested in the effect of several variables on severity of schizophrenia symptoms. I want to look at the effect of 9 predictor...

    Started by the_gentle_ninja‎, 06-03-2017 08:39 PM
    bivariate regression, linear regression, multiple regression, regression
    • Replies: 3
    • Views: 680
    06-05-2017, 08:32 AM Go to last post
  53. Master thesis, statistics check!

    About me: Medical student with minimal statistical knowledge or research experience Question related to: statistical regression/correlation...

    Started by DutchMedicalStudent‎, 05-22-2017 09:30 AM
    blinded data, correlation, master thesis, spearman correlation
    • Replies: 12
    • Views: 2,262
    06-02-2017, 03:24 AM Go to last post
  54. Question Analyzing Tagged Content: Is a Multiple Regression Analysis the Right Approach?

    I’m working with a relatively small data set that consists of several hundred social media posts, key engagement metrics and up to 10 content “tags”...

    Started by stupidpoeticjustice‎, 06-01-2017 02:09 PM
    marketing, regression analysis, social network, statistics
    • Replies: 1
    • Views: 513
    06-02-2017, 12:10 AM Go to last post
  55. Repeated measures question

    Hello. I have taken day to day repeated measures in number of predictor variables as well as some other ordinal dvs. I want to meaure the effect of...

    Started by LEMONIAS‎, 11-20-2016 06:56 PM
    • Replies: 6
    • Views: 3,052
    05-31-2017, 04:14 AM Go to last post
  56. Seeking advise on predictive modeling approach

    Hello dear forum members! Currently, I am working on a project that aims to predict a certain cancer-related outcome (y) using a number of control...

    Started by kiton‎, 05-30-2017 12:08 PM
    • Replies: 3
    • Views: 756
    05-30-2017, 05:27 PM Go to last post
  57. Seek non-black box alternative to random forest

    I've recently had a research manuscript rejected by an editor. The manuscript showed that for a real life data set, random forest outperformed...

    Started by abendrot‎, 05-30-2017 11:04 AM
    • Replies: 1
    • Views: 795
    05-30-2017, 11:55 AM Go to last post
  58. Regression for river level prediction

    I am an avid whitewater kayaker. Many streams have US Geological Survey (USGS) gauges on them. However, some of the best do not. I would like to...

    Started by RhythmanJoe‎, 05-29-2017 11:09 PM
    • Replies: 1
    • Views: 611
    05-30-2017, 09:00 AM Go to last post
  59. Regression

    Hi How I can use regression analysis?

    Started by Kimudao‎, 05-27-2017 11:46 PM
    • Replies: 2
    • Views: 570
    05-28-2017, 09:41 PM Go to last post
  60. Question R square read with or without confounder in the analysis

    Hey, My bachelor thesis is about fatigue, nausea and cognitive decline in patients who have head and neck radiation. For example, the dependent...

    Started by lisa177‎, 05-27-2017 07:35 AM
    confounders, multivariable, r square
    • Replies: 2
    • Views: 766
    05-28-2017, 06:38 AM Go to last post

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