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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...

• Replies: 1
• Views: 26
Today, 08:30 AM
2. ### 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...

• Replies: 0
• Views: 67
Yesterday, 11:02 AM
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...

• Replies: 2
• Views: 80
10-21-2017, 09:21 PM
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...

• Replies: 0
• Views: 60
10-21-2017, 06:25 PM
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...

• Replies: 0
• Views: 47
10-21-2017, 04:38 PM
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...

• Replies: 4
• Views: 514
10-19-2017, 09:10 AM
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...

• Replies: 4
• Views: 159
10-17-2017, 10:43 AM
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...

• Replies: 0
• Views: 78
10-17-2017, 04:33 AM
9. ### 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...

• Replies: 0
• Views: 62
10-16-2017, 08:15 AM
10. ### Simple Regression

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

• Replies: 0
• Views: 126
10-10-2017, 01:32 PM
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...

• Replies: 1
• Views: 92
10-09-2017, 09:07 AM
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...

• Replies: 4
• Views: 223
10-03-2017, 04:53 AM
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...

• Replies: 0
• Views: 192
10-01-2017, 07:10 AM
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...

• Replies: 4
• Views: 262
09-28-2017, 04:40 AM
15. ### 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...

• Replies: 13
• Views: 473
09-25-2017, 02:36 PM
16. ### 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...

• Replies: 0
• Views: 137
09-25-2017, 08:22 AM
17. ### 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...

• Replies: 3
• Views: 160
09-22-2017, 08:59 AM
18. ### 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...

• Replies: 0
• Views: 150
09-20-2017, 11:41 PM
19. ### 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...

• Replies: 0
• Views: 131
09-20-2017, 09:33 PM
20. ### 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...

• Replies: 11
• Views: 502
09-20-2017, 08:06 AM
21. ### 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...

• Replies: 0
• Views: 131
09-19-2017, 03:25 AM
22. ### 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? ...

• Replies: 23
• Views: 1,004
09-15-2017, 04:15 AM
23. ### 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...

• Replies: 13
• Views: 808
09-13-2017, 06:03 PM
24. ### 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...

• Replies: 0
• Views: 164
09-13-2017, 12:03 PM
25. ### 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,...

• Replies: 1
• Views: 222
09-08-2017, 04:50 AM
26. ### 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...

• Replies: 13
• Views: 558
09-06-2017, 05:53 PM
27. ### 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? ...

• Replies: 4
• Views: 371
09-01-2017, 03:41 PM
28. ### 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...

• Replies: 3
• Views: 270
09-01-2017, 03:30 PM
29. ### 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...

• Replies: 6
• Views: 387
08-29-2017, 04:43 AM
30. ### [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: ...

• Replies: 4
• Views: 323
08-25-2017, 12:00 PM
31. ### 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...

• Replies: 5
• Views: 343
08-25-2017, 09:19 AM
32. ### 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...

• Replies: 5
• Views: 506
08-13-2017, 05:27 AM
33. ### 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...

• Replies: 6
• Views: 577
08-12-2017, 11:34 AM
34. ### 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...

• Replies: 1
• Views: 230
08-11-2017, 02:04 PM
35. ### 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...

• Replies: 0
• Views: 263
08-10-2017, 06:11 AM
36. ### 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...

• Replies: 12
• Views: 3,388
08-07-2017, 07:31 PM
37. ### 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...

• Replies: 1
• Views: 275
08-07-2017, 06:41 PM
38. ### 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...

• Replies: 3
• Views: 275
08-04-2017, 01:31 PM
39. ### 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...

• Replies: 0
• Views: 245
08-01-2017, 03:22 AM
40. ### 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...

• Replies: 1
• Views: 296
07-31-2017, 08:49 AM
41. ### 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...

• Replies: 0
• Views: 248
07-28-2017, 06:33 PM
42. ### 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...

• Replies: 1
• Views: 382
07-21-2017, 11:16 AM
43. ### 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...

• Replies: 2
• Views: 455
07-21-2017, 07:21 AM
44. ### 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...

• Replies: 2
• Views: 373
07-21-2017, 03:05 AM
45. ### 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...

• Replies: 0
• Views: 277
07-20-2017, 06:40 AM
46. ### 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...

• Replies: 2
• Views: 733
07-10-2017, 06:56 PM
47. ### 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:...

• Replies: 2
• Views: 587
07-10-2017, 06:42 PM
48. ### 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...

• Replies: 1
• Views: 496
07-07-2017, 01:42 AM
49. ### 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...

• Replies: 8
• Views: 635
07-06-2017, 03:25 AM
50. ### 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...

• Replies: 0
• Views: 295
07-01-2017, 11:22 PM
51. ### 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...

• Replies: 1
• Views: 410
06-27-2017, 12:46 PM
52. ### 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...

• Replies: 2
• Views: 590
06-26-2017, 11:20 AM
53. ### 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 -...

• Replies: 0
• Views: 406
06-26-2017, 08:28 AM

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