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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. Problem with Data analysis on Likert Scale!

Hello John, Im a student of Business studies and am working on a research project titled as "Impact of Physical environment on Employee...

• Replies: 10
• Views: 16,180
07-09-2016, 03:44 AM
2. non-significant predictor became significant after including additional predictor?

Hi everyone, I have a quick question concerning a program I am having in multiple regression. I have a working full mediation model, that is,...

• Replies: 10
• Views: 3,144
01-05-2015, 09:37 PM
3. 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: 11,813
02-27-2016, 11:51 PM
4. Partial Linear Regression

I have an S shaped (sigmoid) curve with moderate noise and I need to estimate the slope of the straight line segment around the hypothetical...

• Replies: 10
• Views: 2,432
08-27-2013, 06:06 AM
5. when to perform a multiple regression test

I have compared my treatment effect for the 4 variables to see which one was affected. Only one variable changed significantly pre vs. post. Can...

• Replies: 10
• Views: 2,434
07-25-2013, 05:09 PM
6. Likert scale regression

I have done a likert type survey ( with 5 point scale) and I am facing problems in analysing the data. following is the situation: Both DV and IV...

• Replies: 10
• Views: 2,345
08-13-2013, 02:53 AM
7. Regression analysis guy wannabe

I'm a math guy that's been out of school for 20 years in a non-math career. I'm interested in learning regression analysis, and I'd like to know how...

• Replies: 10
• Views: 2,010
10-03-2013, 12:11 PM
8. ARIMA Modelling

I'm performing some ARIMA modelling on time series data for UK energy consumption for my dissertation at university. At a bit of a loss though. So...

• Replies: 10
• Views: 2,487
12-17-2013, 09:47 AM
9. parameter estimate of categorical variable

I run multiple regression with 2 continuous and 1 categorical variable (3 levels). SAS will hold the last level of the categorical variable and will...

• Replies: 10
• Views: 2,768
12-23-2013, 10:48 PM
10. Expected Multicollinearity: Alternative to Regression?

Hello, I currently extracting a lot of slightly different variables from a Social Network dataset, which I want to regress (or something like...

• Replies: 10
• Views: 2,576
01-21-2014, 11:30 AM
11. Testing whether two related slopes/intercepts are different from each other

Hi, I'm new and stuck. I want to see if the intercepts and slopes of two linear regression lines are significantly different. I thought I found...

• Replies: 10
• Views: 2,511
09-19-2014, 01:43 AM
12. Nonsignificant mediation analysis

Hello there, first post in this forum. I hope this is the correct subforum, as I have a question regarding psychology statistics, but I am using a...

• Replies: 10
• Views: 1,712
06-07-2015, 01:28 PM
13. cross-validated AUC

Hello All, I hope the thread's title makes sense to you. I need to perform internal Cross-Validation using k-fold CV (needless to say, to assess how...

• Replies: 10
• Views: 2,246
11-27-2015, 03:32 PM
14. 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: 1,806
02-01-2016, 10:37 AM
15. Violation of linearity assumptions - binary logistic regression - what to do?

I am running a binary logistic regression with SPSS and unfortunately the assumption of linearity (Box-Tidwell procedure) are not met for the...

• Replies: 10
• Views: 2,441
05-26-2016, 01:46 PM
16. comparing extremes of an independent variable

Dear all, I have been cracking my head for 2 weeks but i havent been able to figure out this, so i decided to ask for help. I have done a...

• Replies: 10
• Views: 1,564
08-04-2016, 07:18 PM
17. Heteroscedastcty with large number of cases

I ignore here that I have populations commonly :p I have heard that heteroscedastcity is not an issue when you have large sample sizes (I have ten...

• Replies: 10
• Views: 2,716
10-17-2016, 01:21 PM
18. Significance Issue in Regression

Hi everyone! I have a statistical question that I hope someone can answer. I am doing a research about relationship between satisfaction and...

• Replies: 9
• Views: 3,903
08-29-2007, 03:17 PM
19. Dissertation help with Likert scale

Hello, I'm having some problems with the stats for my dissertation. My dissertation is about the effect of the physical surroundings of a...

• Replies: 9
• Views: 11,532
04-16-2008, 01:27 PM
20. Multiple Regression with Multiple Groups

Hello, I am looking at predictor variables (scores on partner perception measures) on a criterion variable (relationship satisfaction), in order to...

• Replies: 9
• Views: 5,630
11-26-2008, 06:58 PM
21. Hlm?

I am working with a large data set, n = 1200+ average course grades culled from over 15,000 students from a school. I ran a regression using average...

• Replies: 9
• Views: 4,873
12-17-2008, 12:21 PM
22. So many variables--how to approach this?

I'm working on a project about depression as a possible side effect of a particular medication. The people who take this drug also tend to have...

• Replies: 9
• Views: 4,143
08-11-2010, 05:24 PM
23. MANOVA vs ANOVA

Hi guys, I have a small question. I ran a MANOVA model, with 4 DV's and 1 IV with 2 categories. I got a non significant result, with P. Value of...

• Replies: 9
• Views: 13,093
09-07-2010, 03:56 AM
24. Comparing coefficients for nested logistic regressions

Hi, maybe one out there can help. I am interested in comparing the coefficients of two binary logistic models. In one nested in the other one,...

• Replies: 9
• Views: 4,436
11-24-2010, 08:45 AM
25. multiple regression with *many* variables

Hello I am not a statistician but interested in knowing how the following problem would be approached by those who are. What would you do if...

• Replies: 9
• Views: 18,749
01-09-2011, 09:35 AM
26. partial r2 vs partial correlation vs stnd coefficients

Hi all, I have run a few linear regression models predicting water quality for watersheds using explanatory variables such as mean impervious...

• Replies: 9
• Views: 20,220
12-11-2011, 09:02 PM
27. Prediction Region/Set from Multiple Logistic Regression

Hello all, I'm not sure how easy or difficult the following question actually is but for all my efforts I haven't been able to find the answer, if...

• Replies: 9
• Views: 4,895
06-11-2011, 12:54 AM
28. Moderation in Logistic Regression

Hi, looking at all the other topics, this is a very basic question, but for me it is really a brain cracker.. I have a conceptual model; ...

• Replies: 9
• Views: 24,645
04-04-2012, 05:36 AM
29. Help with Regression Analysis

It's been a while since I've done a regression analysis. I'm trying to run a multivariate regression analysis in Excel to determine whether or not...

• Replies: 9
• Views: 4,286
07-12-2011, 04:34 PM
30. What regression methods to study?

I am currently putting in a proposal for an independent study course in the summer in regression. Part of it is which regression methods and...

• Replies: 9
• Views: 2,545
10-24-2011, 03:49 PM
31. t-test for categorical predictors in regression WRONG!?

hey people... so i am sitting in my theory of GLMs class... and the prof just said something i had never ever heard in my life... which is that, in...

• Replies: 9
• Views: 4,301
10-26-2011, 01:08 PM
32. Categorical variables and interaction in MLR

Would it be correct, to add in multiple linear regrression interaction between two categorical variables (i transformed them - dummy variavles) with...

• Replies: 9
• Views: 3,364
11-19-2011, 04:14 PM
33. Stepwise selection and dummy variables

Hi Can you do forward or backward selection if there are categorical variables involved? If you can, how can it be done? Is there a way to...

• Replies: 9
• Views: 7,181
12-21-2011, 09:38 AM
34. (Li'l) theoretical question about correlations in regression...

hey y'all people!??! how're y'all doooin' huh? i hope everyone had the most awesomest holidays!!! heh. so... who else is feelin' the pinch this...

• Replies: 9
• Views: 3,132
01-09-2012, 02:44 AM
35. Standard error of coefficients for ols vs regression through the origin

Hi guys, Thought I'd throw this out there officially since I'm having some trouble. I'm under the current impression that if you set up a...

• Replies: 9
• Views: 4,453
01-12-2012, 08:05 PM
36. F-Test Interpretation and Log-Linear?

Hey. I have found this a very difficult subject to self-teach and unfortunately I have not found my teachers particularly helpful. Sorry about the...

• Replies: 9
• Views: 4,286
Jak
04-27-2012, 01:40 PM
37. Help! my model isn't predicting any yes outcomes and don't know why

I am producing a logistical regression analysis to find a model to predict whether someone has minor mental health problems or not. I'm almost...

• Replies: 9
• Views: 2,044
04-20-2012, 02:57 AM
38. How to avoid collinearity in regression

Hi there, I am new in statistics so my question will be a bit naive. When I perform regression, some variables are excluded. It is, maybe, because...

• Replies: 9
• Views: 5,546
09-09-2012, 06:57 AM
39. Time Series - Differencing the data

I'm still trying to teach myself time series and have a bunch of questions about differencing the data. I would be super appreciative if anyone could...

• Replies: 9
• Views: 9,250
09-17-2012, 12:46 PM
40. Are my residuals normal?

Hi there, I have performed a multiple regression analysis and am checking the assumptions. The normal probability plot is not exactly a straight...

• Replies: 9
• Views: 2,214
09-05-2012, 06:17 PM
41. Question on Finding the Design Matrix

For the above question, I was wondering if someone could help me find the design amtrix in question a) It seems like from the question tat there...

• Replies: 9
• Views: 3,547
09-18-2012, 10:49 AM
42. Mediation Analysis- What does zero means?

Hi Can I check if my understanding of mediation analysis is correct. For example, I have found the ab (indirect effect) is 0.01, can I assume...

• Replies: 9
• Views: 2,874
10-18-2012, 05:03 PM
43. Are these models nested?

I have three logistic regression models. Model 1 is the reference model with covariates GA + BW. Model 2 is a quadratic model with GA + BW +...

• Replies: 9
• Views: 3,740
11-11-2012, 04:37 PM
44. Logistic Regression Skewed Data with Lots of zeros!

Hello, I am working on a Logistic Regression where the results that I am getting are not satisfactory. The hosmer and lemeshow test is being...

• Replies: 9
• Views: 9,539
04-24-2013, 05:58 PM
45. Price Elasticity based on log regression

Hello genius people!! 1) If i understand correctly, In the regression equation below, WS= White shoes BS=Black shoes Sales of WS = β1...

• Replies: 9
• Views: 41,578
02-04-2013, 01:26 PM
46. Multiple regression - assumptions

Hi, I performed experiments on two plant species, growing them together in mixtures. I repeated this experiment in 4 nutrient concentrations. I...

• Replies: 9
• Views: 2,378
03-28-2013, 06:58 AM
47. Not Significant Coefficients

I've run a logit regression to estimate the probability of attending high school. I've done this for many years. The thing is that some coefficients...

• Replies: 9
• Views: 2,591
06-05-2013, 11:29 AM
48. Binomial Logistic Regression - Predicted Probabilities

Hi. I’m taking my first steps on binomial logistic regression and I was hoping you could help me with some doubts I’m having. My model has a...

• Replies: 9
• Views: 2,157
06-05-2013, 08:38 AM
49. Regression Model is Significant but...none of the independent variables are?

I have a regression Model that is significant but none of the independent variables are? What does this mean? How can i discuss the results? ...

• Replies: 9
• Views: 1,910
07-14-2013, 06:18 PM
50. Several transformation in multiple linear regression to achieve normality

I am an undergraduate student doing a dissertation on forecasting using multiple linear regression. I am creating a multiple regression equation in...

• Replies: 9
• Views: 1,514
06-27-2013, 11:42 AM

Hello, I have a question regarding to rsquare. I have a model with 1 independent variable which I measure with Rsquare and I have a model with 3...

• Replies: 9
• Views: 2,275
08-23-2013, 03:58 AM

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