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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Measurement method for DV changed during longitudinal study

Hi All, I'm performing a data analysis on a dataset I didn't do the collection for, and I am contending with some odd decisions made by the people...

• Replies: 0
• Views: 532
11-30-2014, 06:36 PM
2. ### Bootstrap

Hey, I am new to this forum and I have a question about Bootstrapping. I want to calculate some critical values. The data generating process is...

• Replies: 2
• Views: 1,414
11-30-2014, 05:45 AM
3. ### Hedonic regression

What is the rationale behind hedonic quality index and how to interpret it? For any example/explanation beside the Wikipedia, I would be very...

• Replies: 0
• Views: 803
11-28-2014, 03:25 PM
4. ### Regression Analysis for comparison of crime rates across a river

I need a bit of help refining a regression comparing crime rates of counties separated by a river. My current equation looks like: ...

• Replies: 1
• Views: 1,013
11-27-2014, 10:31 PM
5. ### Newbie question why we use regression ?

Hello , Can someone explain to me why we use regression analysis , it will help us in understanding what ? , what we will gain from doing regression...

• Replies: 2
• Views: 731
11-27-2014, 10:28 PM
6. ### What is the “pdm” stat in the “rms” R package?

I am new to the world of Regression in statistics and I have been doing a research in which I am building an ordinal logistic regression model (ORM)....

• Replies: 0
• Views: 2,451
11-27-2014, 07:17 PM
7. ### Interpreting multiple regression beta values

Basic question here but just want to double check my understanding.. When I do a multiple regression I get beta values b1=0.01 and b2=0.7 This...

• Replies: 5
• Views: 1,051
11-27-2014, 03:33 PM
8. ### Guidance needed

I am in healthcare and I want to predict future volume (primarily just the end of the current month). The problem I have with using a traditional...

• Replies: 2
• Views: 985
11-25-2014, 04:42 PM
9. ### Panel Data: Add Fixed Effects Before or After Controls?

Hi all, I'm using 51 entities with seven independent variables. Is it typically better to add entity/time fixed effects at the beginning or at the...

• Replies: 0
• Views: 890
11-25-2014, 12:27 AM
10. ### Running multple, multiple regressions? which statistical test should i use?

I have done a study on whether personality and demographics predict interaction on facebook brand pages. I have used a Big five personality scale...

• Replies: 5
• Views: 1,322
11-22-2014, 08:18 AM
11. ### Regression analysis with independant variable (error) and multiple dependant variable

So I took a lot of data (~10000) on a machine (3D printer). For each reading, I got the error and a lot of different parameter (speed, voltage,...

• Replies: 26
• Views: 4,370
11-21-2014, 08:24 AM
12. ### Analyse a variable as continuous and as categorical

Hello everybody I performed a univariate analysis of a set of predictors. My plan was to include the significant predictors in a multivariate cox...

• Replies: 3
• Views: 1,229
11-21-2014, 08:14 AM
13. ### Double Regression?

I am looking at two years of financial info by month. I need to project out next month - however, at the end of our one fiscal year there was a...

• Replies: 1
• Views: 775
11-20-2014, 03:08 PM
14. ### Mathematical calculation in Access

I have a math problem and I want to ask me pomognete.I working on complex desktop database.My main point is making the application for the simulation...

• Replies: 1
• Views: 870
11-18-2014, 05:16 PM
15. ### 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: 2,005
11-18-2014, 09:27 AM
16. ### 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: 892
11-16-2014, 03:52 PM
17. ### 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: 1,323
11-16-2014, 08:42 AM
18. ### 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: 2,379
11-14-2014, 11:12 AM
19. ### 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: 761
11-14-2014, 11:08 AM
20. ### 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: 1,069
11-14-2014, 10:58 AM
21. ### 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: 1,612
11-14-2014, 07:17 AM
22. ### 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: 1,004
11-12-2014, 11:10 AM
23. ### 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: 1,058
11-10-2014, 01:07 PM
24. ### 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: 1,086
11-08-2014, 08:06 AM
25. ### 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: 755
11-08-2014, 04:56 AM
26. ### 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: 1,125
11-07-2014, 09:35 AM
27. ### 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: 7,099
11-03-2014, 10:04 PM
28. ### 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: 1,026
10-29-2014, 05:44 PM
29. ### 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: 1,309
10-29-2014, 08:46 AM
30. ### 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: 836
10-23-2014, 05:12 PM
31. ### 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: 927
10-23-2014, 04:56 AM
32. ### 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: 2,097
10-21-2014, 04:18 PM
33. ### 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: 1,508
10-18-2014, 05:41 AM
34. ### 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: 778
10-17-2014, 10:50 AM
35. ### 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: 1,698
10-16-2014, 01:50 PM
36. ### 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: 1,723
10-15-2014, 12:45 PM
37. ### 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: 961
10-15-2014, 10:38 AM
38. ### 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: 1,036
10-14-2014, 11:24 AM
39. ### 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: 1,746
10-11-2014, 10:07 AM
40. ### 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: 1,045
10-10-2014, 02:22 PM
41. ### 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: 2,229
10-10-2014, 01:08 PM
42. ### 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: 1,489
10-10-2014, 01:02 PM
43. ### 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: 804
10-10-2014, 12:39 AM
44. ### 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: 1,118
10-09-2014, 02:37 PM
45. ### 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: 779
10-08-2014, 09:19 PM
46. ### 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: 933
10-05-2014, 05:31 AM
47. ### 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: 1,739
10-04-2014, 10:47 AM
48. ### 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: 1,548
10-02-2014, 12:42 PM
49. ### 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: 1,953
10-01-2014, 07:09 PM
50. ### 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: 1,099
10-01-2014, 02:08 PM
51. ### 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: 1,331
10-01-2014, 11:08 AM
52. ### 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: 1,763
10-01-2014, 03:57 AM
53. ### 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: 966
09-30-2014, 09:22 AM
54. ### 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: 1,016
09-30-2014, 04:37 AM
55. ### 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: 981
09-30-2014, 04:32 AM
56. ### 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: 805
09-28-2014, 11:30 PM
57. ### 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: 1,115
09-27-2014, 09:43 AM

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