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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### SVAR parameter standard errors

Hi everyone, How to calculate the standard errors of SVAR parameters. I know how to estimate it for contemporaneous parameter. I want to know how...

• Replies: 2
• Views: 988
11-18-2014, 09:27 AM
2. ### Dummy variables (and poster!)

Hi, Could someone please help me understand dummy variables? If I had a variable which was “Religion” that was coded: 1 = Catholic 2 =...

• Replies: 1
• Views: 641
11-16-2014, 03:52 PM
3. ### Interaction/Moderation Question

So I know that the terms interaction and moderation are used pretty much interchangeably. However, is it possible for variables to interact without...

• Replies: 4
• Views: 886
11-16-2014, 08:42 AM
4. ### Reporting results of non-linear regression with centered variables

Hi I have a regression y = a + b1(x) + b2(x^2) + ...bn + e when i run the regression b1 and b2 are significant (and of opposite sign) but...

• Replies: 3
• Views: 1,089
11-14-2014, 11:12 AM
5. ### Rank-ordered Logistic Regression - assumptions?

Hello dear forum members, The DV in the recently undertaken study is Rank (1-899). I believe, rank-ordered logistic regression is the proper type...

• Replies: 0
• Views: 505
11-14-2014, 11:08 AM
6. ### how to find interaction terms in regression modeling

Given a set of predictor variables, are there any ways to test interaction terms? If I test one by one, it will be impossible to do it?

• Replies: 3
• Views: 719
11-14-2014, 10:58 AM
7. ### Hotelling's Trace v. Hotelling's T^2- Why make the move?

Hello, I am writing a dissertation and my chair wants me to convert Hotelling's Trace (resulting from my MANOVA) into Hotelling's T^2. No problem...

• Replies: 0
• Views: 616
11-14-2014, 07:17 AM
8. ### Avoiding spurious regression in meta-regression using stationary variables like GDP

I have been reading everything I can get my hands on about spurious regression but can't seem to definitively find out what is best in regressing...

• Replies: 0
• Views: 638
11-12-2014, 11:10 AM
9. ### Instrumental Variable Regression

Dear All I am writing my master thesis about countervailing power in the HIV medication drug market. For doing so I am conducting the regression:...

• Replies: 1
• Views: 738
11-10-2014, 01:07 PM
10. ### Calculating AUC for just one binary variable legitimate?

Dear members of talkstats, I am a junior Radiology resident in France and I have an urgent question about my study. I am checking the capability...

• Replies: 4
• Views: 928
11-08-2014, 08:06 AM
11. ### help deciding on best fit regression model

Hi I could do with some assistance for selecting a regression model for my data. The data is for a BSc science study and is analyising the...

• Replies: 0
• Views: 583
11-08-2014, 04:56 AM
12. ### Some Conceptual Questions About Quantile Regression

Dear all, I have been teaching myself how to run quantile regression in R using the package called "quantreg." I was able to run these analyses...

• Replies: 1
• Views: 750
11-07-2014, 09:35 AM
13. ### Logistic Regression on small sample size/case ratio - SPSS?

Hi all - I have a small issue. I have a categorical dichotomous DV (0,1) with 4 IV's , two of which are categorical and dichotomous (0,1), and the...

• Replies: 2
• Views: 4,928
11-03-2014, 10:04 PM
14. ### Get correlation matrix of 3 variables from any combination of 3 simples/partials

Here is the situation. I am writing a program that does Cool And Interesting Things starting with a correlation matrix among 3 variables: call...

• Replies: 0
• Views: 713
10-29-2014, 06:44 PM
15. ### Forecasting with fewer data points

Hi, Can someone provide more insights on how we can achieve forecasting with fewer data points and come up with more accurate models. I have...

• Replies: 4
• Views: 813
10-29-2014, 09:46 AM
16. ### Reporting variables into main equation after sqrt or log transformation

Hi Everybody, If I am creating a multiple regression model such as Y = 3 + 1.5apple + 2melon and some of the indipendent variables underwent a...

• Replies: 0
• Views: 572
10-23-2014, 06:12 PM
17. ### Analysis of a longitudinal study where interventions are received at different times

I have a data set of university students. The university has 8 different assisting programs, mostly like scholarships, for needy students to help...

• Replies: 2
• Views: 614
10-23-2014, 05:56 AM
18. ### Summarizing time series data

Hello, Thank you very much for taking the time to read this! I have many (~70) time series showing the average body size (kg) for the ~50...

• Replies: 5
• Views: 1,148
10-21-2014, 05:18 PM
19. ### Inclusion of a control variable makes a predictor significant

I'm running a logistic regression model. The outcome is political activism (1/0) and the significant predictors (dummy variables) are education,...

• Replies: 3
• Views: 1,083
10-18-2014, 06:41 AM
20. ### How can log link still allow negative predicted values?

I have been attempting to get a meaningful outcome of my data for months, and could really do with some help where to go next. I am attempting to...

• Replies: 0
• Views: 557
10-17-2014, 11:50 AM
21. ### Multilevel: Include only two dummies of a 7-1 dummy set into random slope?

I am calculating a two-level linear multilevel analysis. A look at the random intercept random slope model showed me a significant decrease in my...

• Replies: 5
• Views: 1,111
10-16-2014, 02:50 PM
22. ### regression models with mixed types of independent variables

I am working on building a forecasting model, the independent variables are grouped into three types: some variables are continuous; some variables...

• Replies: 6
• Views: 1,171
10-15-2014, 01:45 PM
23. ### Hierarchical Regression Analyses - Testing for a Potential Power Issue

Hi all, My sample consists of 236 participants and I am interesting in investigating the association of several factors with my outcome variable....

• Replies: 1
• Views: 736
10-15-2014, 11:38 AM
24. ### Probing of interaction effect with MODPROB (Preacher & Hayes)

Hello everyone, I have a result that I cannot quite understand. I have the following equition Y: Regret X: curiosity M: 2 conditions (0=...

• Replies: 1
• Views: 670
10-14-2014, 12:24 PM
25. ### positive loglikelihood?

It seems to be no issue to have positive log likelihood in linear regression. How should I however interpret two positive LLs? In normal situation...

• Replies: 1
• Views: 891
10-11-2014, 11:07 AM
26. ### Is poisson regression appropriate?

This is more of a general stats question regarding the best procedure to answer my question of interest. I started to address it using poisson...

• Replies: 0
• Views: 764
10-10-2014, 03:22 PM
27. ### Regression with cointegrated time series data

Hello, I am studying a predator-prey relationships using field data collected biannually over 5 years. For example, here is some abundance data: ...

• Replies: 3
• Views: 1,203
10-10-2014, 02:08 PM
28. ### Regression when IV are part of DV

I have a DV that is made up of 7 IV. If you combine the IV you get the DV. I want to know the relative impact of each of the IV on the DV (relative...

• Replies: 7
• Views: 1,091
10-10-2014, 02:02 PM
29. ### Appropriateness of semi-partial correlation squared when there are 10 predictors?

Hi all, I'm conducting multiple regression with a regression model consisting of 10 predictors (4 of which are key study variables, the remainder...

• Replies: 0
• Views: 582
10-10-2014, 01:39 AM
30. ### Question about modeling public behavior

I signed-up for this site hoping someone might be able to help me with a question I've been struggling with. I'm currently building a model that...

• Replies: 3
• Views: 748
10-09-2014, 03:37 PM
31. ### Help, regression analysis for unbalanced data set

Hi, guys, I need test whether a gene is differentially expressed between two groups, for example, In group 1, we have species A, species B,...

• Replies: 0
• Views: 585
10-08-2014, 10:19 PM
32. ### Feedback Questions (Robust)

Dear all, Have recently had some high level feedback on a regression study. "How robust is your empirical results? I would like to see some...

• Replies: 1
• Views: 684
10-05-2014, 06:31 AM
33. ### How to reduce variables in multiple linear regression when multicollinearity present?

Good morning, afternoon, evening to everyone. First and foremost, this is my innaugural post so I hope I am following all of the recommended...

• Replies: 6
• Views: 1,234
10-04-2014, 11:47 AM
34. ### Mixed models can variable be both fixed and random

I am conducting an analysis over multiple subjects over several sessions with two types of controls. I want to conduct a mixed model analysis to...

• Replies: 0
• Views: 765
10-02-2014, 01:42 PM
35. ### range of tuning parameters

Hi All, I have just started my advanced statistics study. And here is one thing I have not been able to understand for long time -- how can we...

• Replies: 6
• Views: 1,131
10-01-2014, 08:09 PM
36. ### Probability of Predicted Values

As I am still just learning regression and other advanced statistical analysis techniques, I have run into a question that I need help with. My Boss...

• Replies: 2
• Views: 724
10-01-2014, 03:08 PM
37. ### Understanding ordinal regression

Hi! This is a really simple question, but one for which the answer continues to elude me! I understand that in a binary logit regression the...

• Replies: 0
• Views: 618
10-01-2014, 12:08 PM
38. ### Binary IV and ordinal DV, suggestions for a model?

Hi guys! Just started at a new company having graduated this year, theyve got me analysing data and producing some key driver analytics. Thing is,...

• Replies: 4
• Views: 1,164
10-01-2014, 04:57 AM
39. ### Time series forecasting

Can any one explain how to forecast volatility in stock markets using auto-regressive models like TARCH, EGARCH etc.

• Replies: 0
• Views: 591
09-30-2014, 10:22 AM
40. ### Interpreting transformations

Say you transformed an X and Y in a regression model and you find that after the transformations X is signficant. Does this mean that the original X...

• Replies: 2
• Views: 789
09-30-2014, 05:37 AM
41. ### whole data vs training/test data

I have time series data of about 150 sample and 8 variables. It is used to generate a interaction network, whose exact structure is not known yet. ...

• Replies: 1
• Views: 710
09-30-2014, 05:32 AM
42. ### Compute time to sell (with 50% probability) at Price P from linear regression

I think this is a very basic question (from a total stat newbie). I'm trying to understand a problem I was given (I'm not a statistics student). It's...

• Replies: 0
• Views: 509
09-29-2014, 12:30 AM
43. ### Small sample cross-sectional regression: different levels

I have a small sample of about 50 firms, clustered in 20 countries. The main explanatory variables of interest are all firm-specific, as well as...

• Replies: 0
• Views: 690
09-27-2014, 10:43 AM
44. ### Linear Regression

Please see this link: http://www.statisticsforum.com/showthread.php?p=4240#post4240

• Replies: 4
• Views: 1,156
09-25-2014, 05:28 PM
45. ### Delogging variables

Hey, I have run a multiple regression. DV is change in the log of assets Parameter Expected Sign Parameter (T stat) Chlnx ...

• Replies: 0
• Views: 699
09-25-2014, 04:18 AM
46. ### Scaling variables in regression

If you need to scale variables in order to get the correct effect size and beta weight for each variable, does this mean you also scale for both...

• Replies: 3
• Views: 1,052
09-24-2014, 04:30 PM
47. ### Multinomial Logistic Regression

I have run a multinomial logistic regression looking to see if being a member of two different groups predicts group membership to 5 categories. I...

• Replies: 0
• Views: 587
mlb
09-24-2014, 06:26 AM
48. ### Pairwise logistic regression - which trait is the dependent trait?

Hi All, Could someone explain the reasoning behind choosing the dependent trait in pairwise logistic regression of two categorical traits. My...

• Replies: 0
• Views: 648
09-22-2014, 09:11 PM
49. ### Bivariate with Normal Probability plots.

This is more of a conceptual question for a problem that I'm working on. My professor is asking questions about normal probability plots and I can't...

• Replies: 0
• Views: 531
09-22-2014, 05:20 PM
50. ### Regression model advice: 1 continuous DV, 2 binary and 1 continuous IV

Hi- I'm trying to build a model to forecast/predict a continous dependant variable based on several predicting variables. 1 of them is categorical...

• Replies: 0
• Views: 728
09-22-2014, 12:22 PM
51. ### Overdispersions and logistic regression

Note the following comment on this: I have never been clear what the difference between grouped and ungrouped data is. My elements, notably...

• Replies: 8
• Views: 1,295
09-20-2014, 09:04 AM
52. ### Adjusted R-squared

Hi, I have a few questions. If I am doing linear regression with only one independent variable, is it ever viable to present an adjusted...

• Replies: 6
• Views: 1,200
09-19-2014, 10:55 PM
53. ### 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: 1,545
09-19-2014, 02:43 AM
54. ### how to calculate R values

Hello members, I have no of observation (n), no of predictors(k) and stand error of estimation(se). Can it be possible to calculate R or RSquare...

• Replies: 1
• Views: 610
09-18-2014, 12:31 PM
55. ### Coefficient of determination interpretation

Hey guys, this my first post in here so hello everyone:) I have a question regarding the coefficient of determination. Wikipedia says: An...

• Replies: 4
• Views: 1,164
09-17-2014, 05:58 PM
56. ### Assumption of Linearity not fulfilled - what to do?

Dear All, I want to conduct a moderated hierarchical regression. I have 3 IVs and one moderator. I started to test the underlying assumptions of...

• Replies: 1
• Views: 1,325
09-17-2014, 03:53 PM

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