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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. Robust regression, bootstrapping and indirect effect

Hi there, I am currently learning to do mediation analysis using bias-corrected accelerated bootstrap confidence intervals, similar to the...

• Replies: 4
• Views: 692
Tux
04-01-2016, 07:55 PM
2. SOS: Linear Regression

Hi guys, it's a first time I am doing regressions for my dissertation and really need your help. I haven't been studying econometrics before, so I ...

• Replies: 0
• Views: 511
04-01-2016, 07:10 AM
3. How to minimize volatility in dataset?

Hi guys, We are currently struggling with a bit of an issue with regards to multiple regression. It concerns how to deal with substantial...

• Replies: 2
• Views: 461
03-31-2016, 12:31 PM
4. Multiple regression with interaction - and dummy variables?

Hi guys! So, here's the deal. I'm in a bit of a pickle here :shakehead I'm currently struggling with a take-home exam where I'm having trouble...

• Replies: 9
• Views: 874
03-31-2016, 09:07 AM
5. Chi Square and Regression

Hi all, First time post so please go easy on me :p I have a bunch of categorical variables that I am thinking of using as predictor variables...

• Replies: 3
• Views: 610
03-30-2016, 12:18 PM
6. Comparing betas with log transformation of independent variable

Hi all, I would like to compare the results of three studies. All use linear regression with continuous independent and dependent variables. The...

• Replies: 0
• Views: 715
03-30-2016, 06:35 AM
7. Anova find significant diferrences

Hi all, I have made an one-way anova in order to test if three populations have the same means. My result is to reject the null hypothesis. So,...

• Replies: 4
• Views: 527
03-30-2016, 01:17 AM
8. How to report a non-significant regression?

Hi guys, For my final year research project, I have a few regression models with non-significant results. I was just wondering what the...

• Replies: 4
• Views: 2,660
03-29-2016, 03:45 AM
9. Ordinal or Multinomial Regression

Hi, If I have a variable called time spend following politics with the following possible responses: No time under half an hour a day...

• Replies: 5
• Views: 624
03-28-2016, 06:16 PM
10. Logistic regression interpretation

Can anyone please interpret these results for me i will be highly obliged. Thank you B S.E. Wald Sig. Do you know the doses of every pesticide...

• Replies: 3
• Views: 632
03-28-2016, 02:35 PM
11. Basic regressionquestion

Hi, I am currently learning ML algorithms and implementing in R. I have a some basic questions. 1.)I know that linear regression an statistical...

• Replies: 2
• Views: 505
03-28-2016, 10:59 AM
12. How to calculate the percentage contribution in full factorial and RSM models

Hi, My question might seem quiet straight forward but here it goes: How can I calculate the percentage contribution of each input parameter in...

• Replies: 0
• Views: 635
03-25-2016, 08:04 PM
13. Proper Interpretation of odds ratio less than 1 for my study

Hello everyone, This is for a PhD, research in psycholinguistics. I have done logistic regression analyses where some chosen predictor...

• Replies: 18
• Views: 21,194
03-25-2016, 03:55 PM
14. Bidirectional relationship with longitudinal data: what's the best model?

N=1000+. I have about 3-4 repetitive measures of a few numerical variables and categorical variables. How do I test the hypothesis that x...

• Replies: 3
• Views: 808
03-23-2016, 09:29 PM
15. Low-prevalence covariates in multiple linear regression analysis

Is there any problem adding low-prevalence covariates to standard multiple linear regression (spontaneous entry)? For example, I have 1000+...

• Replies: 2
• Views: 462
03-23-2016, 07:59 PM
16. Regression individual and group-level data

Hi all, I'm testing whether observing behavior leads to copying behavior (monkey see, monkey do) in a team setting. I've collected data from...

• Replies: 3
• Views: 566
03-23-2016, 07:40 PM
17. Compare Correlation Coefficients

Hi everyone, I currently have to do an empirical work in Stata and need some help. I have a regression in this form and want to compare the...

• Replies: 0
• Views: 348
03-22-2016, 11:31 AM
18. Both categorical and continuous predictors?

I'm sure this is very simple but I just want to be sure. I have actually been searching the web for a while now and can't seem to find a clear...

• Replies: 5
• Views: 816
03-21-2016, 04:35 PM
19. Dummy variables with categorical data with multiple levels.

This always seemed easy to me, largely because I always had an obvious reference group before or I was dealing with variables that had only 2 levels....

• Replies: 12
• Views: 1,398
03-21-2016, 08:13 AM
20. Logistic regression in SPSS

I have designed a question and now intend to use SPSS to run regression to analyse the results: My dependent variable is: intention to vote. Yes...

• Replies: 0
• Views: 467
03-19-2016, 11:11 AM
21. "Sensitivty" analysis

I have not encountered this before. It occurs in the context of "mixed effects OLS regression" (not sure exactly what type of regression that is...

• Replies: 4
• Views: 696
03-18-2016, 04:10 PM
22. Intercept becoming negative(More IDVs)

Hi All, I have a small query. When regressing revenue against cost, my intercept is positive for X% combos where each combo consists of data...

• Replies: 6
• Views: 572
03-18-2016, 04:08 PM
23. Introductory references about total least squares

I am an engineering student and I've been recently told about the Total Least Square (TLS) method. I am interested in applying it to topographic...

• Replies: 1
• Views: 298
03-18-2016, 10:37 AM
24. Partial effect plot: Which options do I have?

Hi, I have a multiple regression model, and I would like to do an effect plot with confidence bands regarding one of the predictors. One solution...

• Replies: 4
• Views: 750
03-17-2016, 02:21 AM
25. Research Method questions

Thanks guys for the response, it was great

• Replies: 3
• Views: 524
03-16-2016, 10:29 AM
26. Prediction Plot with CI's: What to do with covariates?

Hi, I have a multiple regression model (especially a GLMM), with - outcome Y, - a fixed effect predictor wich is in the main focus of...

• Replies: 0
• Views: 388
03-15-2016, 05:21 AM
27. MSE vs variance of residuals

Can someone help me understand the distinction between the Mean Square Error and the variance of the residuals i)] in a linear regression? I thought...

• Replies: 0
• Views: 982
03-15-2016, 04:28 AM
28. Fishing with data: Use of multiple regressions on the same data set

I have approached this issue, running multiple models with the same data set usually in the context of FW error . It is the habit of running multiple...

• Replies: 2
• Views: 618
03-14-2016, 01:25 PM
29. Linear regression vs logistic regression

I have a time series dataset. The, X (Independent variable) is time and is denoted as 1,2,3,4,5,6..1000.etc Y (Dependent variable ) is a...

• Replies: 2
• Views: 675
03-14-2016, 08:28 AM
30. Test of non-linearity

How do you actually test for non-linearity in linear regression. I have heard Box-Tidwel test mentioned, but I have yet to find out how you do it. ...

• Replies: 0
• Views: 411
03-11-2016, 09:27 AM
31. Regression: DV is Revenue and IDV is cost. (Very High MAPE)

Need help on one of the modelling assignment. My dependent variable is Revenue and the independent variable is Cost beside some other variables...

• Replies: 8
• Views: 897
03-11-2016, 09:24 AM
32. (Poisson/NegBin, RE) Estimation of time-invariant predictors in a panel model

Hello dear forum members, For a time being I had been working with the following model (Stata command format): - xtpoisson y x1 x2 x3 x4 x5, fe-...

• Replies: 3
• Views: 860
03-10-2016, 05:02 PM
33. chemical analysis

Hi guys help me? I have a problem. I have to analyze a product just finished the processing (hot) and subsequently when it is cooled to room...

• Replies: 13
• Views: 1,147
03-10-2016, 11:56 AM
34. regression of car accidents vs age (question about normality and implement gender)

a few basic questions. I'm just starting to learn regression so I'm trying to apply what I'm learning. I have a set of data with ages ranging...

• Replies: 14
• Views: 1,427
03-09-2016, 05:11 PM
35. Question about linear regression & residuals

I have been reading up on linear regression and residual plots here on stattrek: http://stattrek.com/regression/residual-analysis.aspx?Tutorial=AP...

• Replies: 2
• Views: 641
03-09-2016, 07:46 AM
36. Categorical variables changing by their groupmean

Hi For a project I need to model industrial data. Large part of the dataset consists out of nominal categorical variables (430 variables in total...

• Replies: 0
• Views: 456
03-08-2016, 05:20 PM
37. When to specify an interaction effect

I have a model with about 20 variables in it (6 of them are dummies from a categorical variable with 7 levels). All of these are suggested by the...

• Replies: 4
• Views: 665
03-08-2016, 01:18 PM
38. Assignment

Please may you help me answer the question, I'm stuck. Thanx!! A property analyst is examining the relationship between the City council’s...

• Replies: 2
• Views: 883
BGM
03-08-2016, 04:22 AM
39. Using median case load as a predictor

I am testing the impact of a contractor or a public unit working with a customer . A big part of this is generating control variables so I can...

• Replies: 1
• Views: 521
03-07-2016, 07:49 PM
40. Prediction Intervals

I am in the process of calculating the prediction intervals on a time series data linear regression model The independent variable in my model is...

• Replies: 0
• Views: 406
03-07-2016, 04:58 AM
41. Good Tool to generate probability of a sale for 300,000 products

Hi - I am trying to determine a good tool that will help me generate a probability of a sale for a list of of 300,000 products. I have a table of...

• Replies: 0
• Views: 410
03-06-2016, 01:37 PM
42. Nonparametric regression using kernel weights

Hi! I am wondering how I can present the results of nonparametric regression. I performed the nonparametric tests using R, and R package 'np'. ...

• Replies: 0
• Views: 566
03-05-2016, 09:57 PM

Hi, Really hope someone can confirm. I think I need to use Multivariate regression for this; - one group of N judges score N performances and...

• Replies: 0
• Views: 384
03-02-2016, 08:58 AM
44. Two variable OLS Regression - using normal equations

Hi, I am experiencing difficulties in understanding the following question; I have been assigned two variables (X and Y), and have been...

• Replies: 0
• Views: 624
03-01-2016, 01:32 PM
45. Split file regression, or Fixed effects Mixed model

Within a dataset that has a few variables explaining dependent variable A, and influences vary over different categories, it can be obvious to split...

• Replies: 2
• Views: 474
03-01-2016, 07:40 AM
46. Linear regression on data with standard deviations?

(crossposting from here) I am trying to do many linear regressions on series of data points where each data point is associated with a standard...

• Replies: 0
• Views: 446
02-29-2016, 12:00 PM
47. Regression Analysis for Paired Data SAS

Hi Everybody, I want to analyze paired data using regression analysis to adjust for covariates. I used PROC MIXED statement in SAS and I modeled...

• Replies: 6
• Views: 962
02-29-2016, 08:52 AM
48. Multivariate regression with paired samples?

Hello, First time poster here. I have data from two groups of people recorded during two different conditions. I would like to study how the...

• Replies: 10
• Views: 7,196
02-27-2016, 11:51 PM
49. Association between categorical and numerical variables using R

Hi, I am new to this forum so please be kind :-). Not sure if this belongs in 'R'. I will describe my problem as good as I can. First of all I am...

• Replies: 5
• Views: 1,126
02-25-2016, 12:06 PM
50. Ordinal logistic regression or linear regression?

Hi Guys, just wondering if I could have your help pls. I have a sample size of 55 patients (of which 22 were subsequently diagnosed with Heart...

• Replies: 0
• Views: 548
02-25-2016, 05:14 AM
51. What is the difference between an interaction effect and a moderator in regression?

I hear these two concepts a lot in the literature. I have no idea what the difference is between a moderator and an interaction term. While I am...

• Replies: 24
• Views: 2,018
02-24-2016, 03:02 PM
52. Panel Data Regression Models!

Hello mates! I am doing thesis (research) as part of my degree completion requirement. My topic is a general one “Capital Structure and Corporate...

• Replies: 1
• Views: 665
02-24-2016, 08:49 AM

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