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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### 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: 12,388
02-27-2016, 11:51 PM
2. ### 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: 3,358
02-25-2016, 12:06 PM
3. ### 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: 1,707
02-25-2016, 05:14 AM
4. ### 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: 4,092
02-24-2016, 03:02 PM
5. ### 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: 1,364
02-24-2016, 08:49 AM
6. ### Pearson correlation coefficient and Standard dev

I know the basic interpretation of r. I.e., -1(<or =)r(<or=1). Critical values for n etc. However, while helping a research nursing student, her...

• Replies: 0
• Views: 786
02-23-2016, 09:02 AM
7. ### Is this really independent

I read an article today that made me wonder. They used linear regression to predict income at closure. One of their predictor variables was income...

• Replies: 3
• Views: 1,337
02-22-2016, 09:33 PM
8. ### Ordinal predictors

I know there was a thread on this. I could not find it. This is the type of issue that concerns me. These authors had an ordinal predictor that...

• Replies: 8
• Views: 1,296
02-22-2016, 05:10 PM
9. ### Reporting results of nonparametric regression

Hi! I am wondering how you present the results of non parametric regression test. I run the nonparametric regression using R, and the package np ...

• Replies: 1
• Views: 1,766
02-20-2016, 07:48 AM
10. ### Help with Interactaction Assesment

Hello! Can anyone explain why my Breslow-Day test for interaction was significant (p=0.0005) but my forward selection logistic regression test for...

• Replies: 7
• Views: 1,920
02-16-2016, 09:19 AM
11. ### Multiple Choice Question Answer

Is there any materials with multiple choice answer for basic statistics? If yes, How can I get it?

• Replies: 0
• Views: 1,128
02-16-2016, 07:07 AM
12. ### anova repeated measures with interaction term

i hva been sitting here for 6 hours trying to figure out what i am doing wrong, but i cant figure it out. I am doing anova with repeated measures....

• Replies: 0
• Views: 1,112
02-12-2016, 07:57 AM
13. ### Effects of general participation and intensity of participation

Exploring data from a quasi-experimental study, we want to investigate effects of general participation in a program (dichotomous; part_dich) aswell...

• Replies: 5
• Views: 2,116
02-10-2016, 08:48 AM
14. ### Best way to treat integer/float column with null values in logistic regression

Hi, I was wondering if anyone can assist me with this issue. I am building a logistic regression model to predict purchase or not purchase...

• Replies: 1
• Views: 1,169
02-10-2016, 03:12 AM
15. ### Need Help for explain variables

Hello Dear Members, I am doing a research on Corporate R&D and market capitalization with 5 variables. There in no co linearity between my study...

• Replies: 3
• Views: 1,770
02-09-2016, 11:00 AM
16. ### twoway ANOVA, post hoc test? New to statistics.

This is probably easy, but this is new to me, hoping for some help here:tup:

• Replies: 1
• Views: 1,550
02-08-2016, 07:39 PM
17. ### Bayesian multiple regression issue in R

I am attempting to generate a multiple regression model using JAGS on R and my results deviate substantially from MCMCregress and lm. I ran out of...

• Replies: 0
• Views: 812
02-03-2016, 05:09 PM
18. ### Correlation for Binary Target Variable

Hi, Just need someone to do a sanity for me. In linear regression, one might want to transform (log, power, etc...) a continuous independent...

• Replies: 0
• Views: 1,029
02-03-2016, 12:01 AM
19. ### How do I test the significance of my correlation coefficients for various regressions

Hi, I have a set of 25 points and I used a TI-84 calculator to calculate the linear, quadratic, logistic, exponential, and power regression models...

• Replies: 0
• Views: 1,209
02-02-2016, 11:10 AM
20. ### New Linear Regression Approach - Link Here

My company has just released a free software download that eliminates known issues associated with traditional techniques. The InoraRAE has a simple...

• Replies: 0
• Views: 985
02-02-2016, 10:42 AM
21. ### Should you use Bonferonni for regression

It is common to generate many models in regression and only report the final one. To me this suggests that you should use some correction like...

• Replies: 10
• Views: 1,943
02-01-2016, 10:37 AM
22. ### [R] Shapley values and relaimpo

Hello everyone! I’ve been pondering this question for some time. I’ve searched online and on this forum and I haven’t found the answer to my...

• Replies: 0
• Views: 1,226
02-01-2016, 10:25 AM
23. ### Correlation and regression

Hello, it would be nice if you could provide the appropriate theoretical steps for the following task: There is a shop which also operates a pub....

• Replies: 0
• Views: 1,096
DZ8
01-30-2016, 08:00 AM
24. ### ANCOVA coding of categorical covariates

Hello all, I am running an ANCOVA in R (Anova function) to assess the results of a randomized experimental study. I have a 2x2 full factorial...

• Replies: 0
• Views: 1,057
01-28-2016, 05:57 PM
25. ### Trend analysis / regression model with missing data

Hi, I want to apply a Poisson GLM to count data, analyzing trends. However, there are missing counts (i.e. missing values in the outcome variable)...

• Replies: 8
• Views: 2,569
01-28-2016, 09:19 AM
26. ### Simple Linear Regression

Dear Experts, Q1) In simple linear regression: a) Under what situations will the estimates b0 and b1 not be well-defined? b) What is the...

• Replies: 2
• Views: 2,154
01-27-2016, 11:17 PM
27. ### Regression following MANOVA results

Hi Stats Gurus, This question is about a regression analysis that I want to run, but I am not too familiar with this type of analysis. I have...

• Replies: 5
• Views: 1,840
01-27-2016, 01:18 PM
28. ### Regression on Survey analysis across 50 states

I ran a survey across all 50 states in the US. The goal is to see if there is a correlation between people's love for the state and the population...

• Replies: 0
• Views: 2,724
01-26-2016, 12:11 PM
29. ### Can I use multivariate analysis without univariate analysis?

Dear all, I have a problem in my data analysis and paper writing. Some variables (dependents) were not statistically significantly correlated...

• Replies: 14
• Views: 24,697
01-26-2016, 11:08 AM
30. ### Can AIC values be combined?

Hello! I have hunted far and wide on the net in an attempt to answer this. Essentially, I'm trying to combine two AIC scores from different parts...

• Replies: 1
• Views: 2,382
01-26-2016, 04:10 AM
31. ### Interpreting coefficients in pooled cross-sectional data with cluster-dummies

Data: pooled cross-sectional data. 6 countries. 3 years of cross sectional data (10 year gaps in between), with different samples of individuals in...

• Replies: 0
• Views: 938
01-25-2016, 10:15 PM
32. ### What to do about violations of assumptions

This is one example of a larger topic Say you are doing logistic regression and you have influential data points. You can't use robust regression...

• Replies: 9
• Views: 1,587
01-25-2016, 06:01 PM
33. ### The Tobit Model

Greatings for all, Suppose we are using the Latent Variable Formulation (i.e. not the Generalized Linear Modeling) for a multiple regression model...

• Replies: 0
• Views: 1,396
01-25-2016, 07:03 AM
34. ### Positive definite issue with Likert data

Hello, I ran my first data set through SPSS for a recent 5-point Likert questionnaire but am returning a "not positive definite" on the reduction. ...

• Replies: 0
• Views: 2,041
01-24-2016, 01:36 PM
35. ### Which test for cont DV, 1 nominal IV (2 cat) + 1 nominal IV (4 cat) + 1 cont IV

Hello, I am a bit struggling with choosing which test I should apply to my data. My dependent variable is continuous (participants could score...

• Replies: 4
• Views: 2,674
01-24-2016, 07:30 AM
36. ### Different signs

Hello everybody: I have a litte problem interpreting my regression output. In the first regression, I have a continuous variable with a...

• Replies: 5
• Views: 1,889
01-24-2016, 05:09 AM
37. ### Ordinal Time-Series Dependent Variable

I am attempting to run a regression with an ordinal DV that is panel/time series data. I only have SPSS and with the ordinal DV, it seems I should be...

• Replies: 3
• Views: 2,032
01-23-2016, 05:00 PM
38. ### [R]: ROC curve after fitting a logistic model to a new datset

Hello, I have fitted a Logistic Regression model (with 1 binary DV, and several IVs), and then I fitted it to a new dataset using the function...

• Replies: 5
• Views: 1,599
01-23-2016, 06:45 AM
39. ### fit an ARIMA-model with t -distributed innovation terms

Hello, I have to fit an ARIMA-model with t -distributed innovation terms (skew-t) with software R. If I use arima function (package "stats") I...

• Replies: 0
• Views: 910
01-22-2016, 10:41 AM
40. ### Bounds for R2 in OLS regression?

Context: From the big dataset I’m working with, my boss is somewhat curious (read skeptic) as for why fitting a multiple linear regression with...

• Replies: 1
• Views: 1,263
01-21-2016, 09:27 PM
41. ### Regression with skewed data

Our data is highly skewed, so much so that we routinely report median values not average ones in descriptive models. Now I am running regression with...

• Replies: 3
• Views: 2,274
01-21-2016, 04:16 AM
42. ### Power analysis and sample size

Hello all, I've used perused this site numerous times in the past for assistance with statistical issues, but this is my first post. I work with...

• Replies: 0
• Views: 1,096
01-19-2016, 03:54 PM
43. ### Cant do a linear regression on a subset of my data: Error

I installed the R package AER, from which you get the data `PSID1982`. Then I define this model: data("PSID1982") set.seed(15606) ...

• Replies: 0
• Views: 563
01-17-2016, 11:53 AM
44. ### Logistic model in overall population or in sub-population?

Hello, I am not sure if this is the right place to ask my question. I really appreciate your help because I am really a beginner in bio...

• Replies: 3
• Views: 1,068
01-15-2016, 11:01 PM
45. ### Comparing the outcome of two contingency tables

Hi all, I have a data set for two different days. The treatments and outcomes are same but the assays were performed on two different days. I...

• Replies: 4
• Views: 2,048
01-15-2016, 12:55 PM
46. ### How to test for difference between 2 R-Squared in Binary Hierarchical Regression?

I ran a BINARY hierarchical regression in SPSS. However, I could not find an option to test change in R-Squared. So is there a way to test it in...

• Replies: 3
• Views: 1,495
01-15-2016, 10:14 AM
47. ### Unimodal Link-function possible?

Hi, using a GLM model (e.g. a Poisson regression), there are various link functions available in statistical packages. However, I don't find an...

• Replies: 6
• Views: 1,570
01-13-2016, 04:03 PM
48. ### Instrumental variable apporach: two stage least squares

Hello everyone, I want to test cross sectional data with a household survey with 60k plus of respondents (however missing data result in overall...

• Replies: 1
• Views: 1,705
01-11-2016, 08:05 PM
49. ### Help with linear regression when multiple subjects

Hi, I have some data where each subject is presented with pairwise combinations of four test items (A, B, C and D). Each observation is a...

• Replies: 0
• Views: 1,498
01-11-2016, 06:01 AM
50. ### Conceptual queries in modeling

Hi all, I am from engineering background. I would require your help in certain conceptual questions in modeling. Your help would be greatly...

• Replies: 2
• Views: 2,220
01-09-2016, 01:53 PM
51. ### Pleease help!? Filling in "blanks" in Regression Output

Hello! Can someone please explain, I need to fill in the blanks marked They provide this info in a row: Coeff:-9074.674 Std.Err: ?? ...

• Replies: 9
• Views: 3,508
01-07-2016, 07:42 AM
52. ### Multiple Regression on Longitudinal AND Cross-sectional data

Hello, I'm trying to make sure I'm doing a hierarchical multiple regression analysis correctly (and interpret the results correctly) with regards...

• Replies: 0
• Views: 999
01-05-2016, 12:22 PM
53. ### Can fixed effects models be used on cross sectional data?

1) Does it make sense to use a fixed effects model on cross sectional data (note, not time-series cross sectional data) if the goal is to account for...

• Replies: 0
• Views: 1,067
01-04-2016, 09:46 PM

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