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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...

• Replies: 11
• Views: 324
Today, 08:06 AM
2. 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: 60
Yesterday, 03:25 AM
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? ...

• Replies: 23
• Views: 719
09-15-2017, 04:15 AM
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...

• Replies: 13
• Views: 626
09-13-2017, 06:03 PM
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...

• Replies: 0
• Views: 101
09-13-2017, 12:03 PM
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,...

• Replies: 1
• Views: 141
09-08-2017, 04:50 AM
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...

• Replies: 13
• Views: 420
09-06-2017, 05:53 PM
8. 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: 246
09-01-2017, 03:41 PM
9. 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: 204
09-01-2017, 03:30 PM
10. 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: 263
08-29-2017, 04:43 AM
11. [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: 264
08-25-2017, 12:00 PM
12. 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: 274
08-25-2017, 09:19 AM
13. 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: 431
08-13-2017, 05:27 AM
14. 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: 433
08-12-2017, 11:34 AM
15. 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: 168
08-11-2017, 02:04 PM
16. 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: 176
08-10-2017, 06:11 AM
17. 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: 2,897
08-07-2017, 07:31 PM
18. 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: 203
08-07-2017, 06:41 PM
19. 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: 217
08-04-2017, 01:31 PM
20. 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: 186
08-01-2017, 03:22 AM
21. 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: 242
07-31-2017, 08:49 AM
22. 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: 181
07-28-2017, 06:33 PM
23. 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: 332
07-21-2017, 11:16 AM
24. 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: 362
07-21-2017, 07:21 AM
25. 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: 292
07-21-2017, 03:05 AM
26. 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: 216
07-20-2017, 06:40 AM
27. 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: 466
07-10-2017, 06:56 PM
28. 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: 422
07-10-2017, 06:42 PM
29. 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: 435
07-07-2017, 01:42 AM
30. 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: 498
07-06-2017, 03:25 AM
31. 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: 251
07-01-2017, 11:22 PM
32. 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: 347
06-27-2017, 12:46 PM
33. 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: 440
06-26-2017, 11:20 AM
34. 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: 283
06-26-2017, 08:28 AM
35. 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...

• Replies: 0
• Views: 303
06-22-2017, 05:04 PM
36. 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...

• Replies: 1
• Views: 479
06-17-2017, 09:50 AM
37. 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...

• Replies: 3
• Views: 687
06-09-2017, 11:56 AM
38. 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...

• Replies: 2
• Views: 538
06-09-2017, 05:29 AM
39. 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...

• Replies: 0
• Views: 284
06-09-2017, 03:32 AM
40. 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...

• Replies: 2
• Views: 310
06-08-2017, 10:16 PM
41. 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?

• Replies: 4
• Views: 463
06-08-2017, 06:19 PM
42. 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...

• Replies: 1
• Views: 562
06-07-2017, 02:33 PM
43. 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...

• Replies: 2
• Views: 594
06-05-2017, 09:44 PM
44. 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...

• Replies: 2
• Views: 513
06-05-2017, 03:35 PM
45. 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...

• Replies: 3
• Views: 680
06-05-2017, 08:32 AM
46. Master thesis, statistics check!

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

• Replies: 12
• Views: 2,262
06-02-2017, 03:24 AM
47. 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”...

• Replies: 1
• Views: 513
06-02-2017, 12:10 AM
48. 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...

• Replies: 6
• Views: 3,052
05-31-2017, 04:14 AM
49. 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...

• Replies: 1
• Views: 795
05-30-2017, 11:55 AM
50. 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...

• Replies: 1
• Views: 611
05-30-2017, 09:00 AM
51. Regression

Hi How I can use regression analysis?

• Replies: 2
• Views: 570
05-28-2017, 09:41 PM
52. 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...

• Replies: 2
• Views: 766
05-28-2017, 06:38 AM

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