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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Data Transformations in Multiple Regression

I have a non-normal distribution for the residuals I'm testing for a multiple regression--what's the best course of action to take? If I transform...

• Replies: 1
• Views: 4,350
06-03-2011, 09:07 PM
2. ### Simple Linear Regression with GUM Uncertainties

I would appreciate it if someone could suggest some references that discuss how to formally incorporate measurement uncertainties (as calculated per...

• Replies: 0
• Views: 4,349
07-23-2009, 04:31 PM
3. ### Differences Between ANOVA and multiple regression

What are the differences between ANOVA and multiple regression? If I want to figure out if there exist impacts of one variable on the other, which...

• Replies: 1
• Views: 4,345
08-30-2010, 09:58 PM
4. ### statistics problem

I am stumped on how to go about making the test statistic for this problem. Any help would be appreciated. Thank you. Suppose that you would like...

• Replies: 7
• Views: 4,337
06-12-2008, 05:56 PM
5. ### Transformed Interactions in Regression

Hi all, I have a quick (but surprisingly difficult) question to ask regarding transformed variables in an interaction term when conducting...

• Replies: 3
• Views: 4,334
03-25-2009, 07:42 PM
6. ### Regression Estimated variance and Chi-square distribution

Hi all * If i have a data set and I model it using linear regression I estimate intercept, slope and variance Ymodel=a+bx and the...

• Replies: 0
• Views: 4,332
11-21-2010, 04:48 AM
7. ### Physiology grad student needing some help - linear regression through the origin

Hi all. I'm a PhD student in physiology, and I seem to be suffering from mild amnesia when it comes to statistics. My old course notes are out of my...

• Replies: 6
• Views: 4,327
01-06-2010, 04:43 AM
8. ### Simple command in SAS for regression with a large number of covariates?

I'm a new poster and I searched before creating this thread, so I hope I'm not raising a common question that is constantly being answered here. ...

• Replies: 4
• Views: 4,325
03-02-2011, 04:25 PM
9. ### [Probit] Can I be confident in my results even with a poor Goodness-of-Fit test?

I am running a probit analysis on a data set with about 1000 cases, predicting probability of college graduation by a set of college institutional...

• Replies: 3
• Views: 4,324
02-18-2011, 03:27 PM
10. ### Continuous Moderator and DV and categorical IV (dummy coded) Help please!!!

I ran an experiment recently and now I'm trying to work out whether either of the covariates (anxiety or avoidance) interact with the effect of any...

• Replies: 1
• Views: 4,324
06-11-2012, 03:28 PM
11. ### help with Linear regression with nfl stats please

Hey guys, just wondering if I could get some help with the best way to use my data. After the challenge system was introduced into the nfl in 1999...

• Replies: 3
• Views: 4,320
04-09-2011, 01:19 AM
12. ### Interpretation of MANOVA

Hello everyone, Forgive me for my ignorance, but I have a quick basic question. When conducting a MANOVA (Using JMP) the output gives me values...

• Replies: 1
• Views: 4,313
11-29-2010, 01:55 PM
13. ### 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: 4,313
Jak
04-27-2012, 01:40 PM
14. ### 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: 4,312
10-26-2011, 01:08 PM
15. ### Interpreting the regression RMSE when responses are measurements with known SD

Hi all, I'm fitting a simple regression model (Y = a + bX) where my responses are measurements whose standard deviations, SD, are available....

• Replies: 8
• Views: 4,312
07-29-2014, 07:11 PM
16. ### 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: 4,305
07-12-2011, 04:34 PM
17. ### Multinomial Logit vs Dummies vs Ordinal Logit

Hello everybody, I need help with the following: I would like to conduct a survey, where my dependent variable would be a discrete, nominal...

• Replies: 0
• Views: 4,299
11-18-2010, 03:22 PM
18. ### Which regression model to use with skewed & ordinal data?

I'm a bit stucked and just wondering about which regression technic to use with my dependent variable at hand. Respondents were asked to provide a...

• Replies: 3
• Views: 4,297
03-19-2013, 04:16 PM
19. ### Using OLS vs Probit/Logit to estimate a threshold

Suppose you're a meteorologist and want to predict whether tomorrow the temperature will exceed 20 degrees. Your boss gives you data where t is...

• Replies: 7
• Views: 4,290
07-04-2012, 04:21 PM
20. ### Ordinal regression vs Linear regression

Here's the situation: I have a categorical dependent variable (3 categories), and 3 continuous explanatory variables. Say I perform an ordinal...

• Replies: 0
• Views: 4,278
03-29-2011, 02:02 AM
21. ### Can "infinite" values be used in regression?

Hello, I am analyzing a series of plots along a recovery gradient, using "time since disturbance" as a continuous variable. I want to see how...

• Replies: 4
• Views: 4,277
04-07-2008, 01:50 PM
22. ### Effect Coding: p-value of reference category

Hi, I fit a regression model with effect coded variables. I'm well aware of how to compute the value for the reference category but I have...

• Replies: 2
• Views: 4,264
02-19-2013, 03:38 AM
23. ### is it possible for all variables results in no significant value?

i need help on my multiple linear regression statistics assignment on conclusion and recommendation part... my problem is all the independent...

• Replies: 0
• Views: 4,257
08-14-2010, 01:12 PM
24. ### Problem with mixed effects model with binary data

Hi guys, I have a question about logit mixed effects model. I tried to use lmer to fit a model with binary dependent variable (Yes or No), a...

• Replies: 2
• Views: 4,256
01-10-2011, 01:00 AM
25. ### Regression approach to ANOVA

I am trying to fit regression for some categorical variables. I have two treatment A(3 levels) and B (2 levels) and their interaction. The output...

• Replies: 6
• Views: 4,254
03-07-2008, 04:10 PM
26. ### Non-Significant Categorical Predictor in Logistic Regression

hi: In the logistic regression modeling one of my predictor is categorical with 4 categories. We use 3 categories considering one as reference...

• Replies: 2
• Views: 4,253
02-02-2012, 10:25 AM
27. ### Pooled cross sectional data: How to test for and handle autocorrelation?

Hi, 1) My goal: I am making a difference-in-difference analysis to estimate the development in political efficacy for a certain group of people...

• Replies: 0
• Views: 4,252
06-23-2012, 09:50 AM
28. ### Nested or Repeated measures analysis for ecology data?

This is a refinement of an earlier question I asked. ...

• Replies: 3
• Views: 4,249
03-18-2013, 11:03 AM
29. ### Poynomial Regression through the origin

I am trying to program in SQL a polynomial regression of degree two with a zero intercept. I can't seem to find the appropriate literature on this...

• Replies: 8
• Views: 4,235
07-24-2012, 05:50 PM
30. ### How to test significance of the mean of multiple OLS regressions (Jensen's Alpha).

Hi. Im working on a paper on mutual fund performance, using Jensen's Alpha to measure performance. Ri-Rf=a+b(Rm-rf)+ei Time series regression,...

• Replies: 1
• Views: 4,224
04-17-2012, 06:23 AM
31. ### Multivariate Regression vs Canonical Correlation

I know the difference between correlation and regression, however, I'm a little confused with the difference between Canonical Correlation (CCR) and...

• Replies: 1
• Views: 4,220
11-17-2012, 06:55 PM
32. ### Panel Data and model specification

Sorry to ask questions which may be obvious to many, but I am just starting out with Stata and econometrics so if anyone could help me I would really...

• Replies: 1
• Views: 4,219
01-22-2011, 12:23 AM
33. ### Calculation of effect size in Hierarchical regression

Hello there, I have conducted a hierarchical regression with two steps. Statistical significance resulted form the first step, as the second...

• Replies: 3
• Views: 4,216
05-29-2013, 11:02 AM
34. ### Segmented Regression Sample Size

Hello, I am using Segmented Regression (SegReg*) to compare proportional occurrence (Y) of 18 species vs. proportional habitat cover (X) to...

• Replies: 0
• Views: 4,215
12-11-2010, 06:45 PM
35. ### Conditional Regression Analysis in SPSS

Hi all, I’m trying to do a matched paired analysis on some data. I have two groups of children, matched by age and sex. Each pair has been given a...

• Replies: 1
• Views: 4,215
02-23-2014, 04:09 PM
36. ### 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: 4,212
09-20-2014, 08:04 AM
37. ### Comparing curves fitted to two quadratic regressions

Hello, I have constructed two calibration curves, i.e. plotting known concentrations against response. Both of these sets of data seem to fit a...

• Replies: 2
• Views: 4,207
03-28-2012, 07:30 PM
38. ### beta = r, so can beta be greater than 1.0?

I have a basic question, but it's been a long time since I learned regression. I'm having trouble reconciling these three facts: (1) In a...

• Replies: 13
• Views: 4,197
11-14-2013, 01:15 AM
39. ### Correcting for omitted variable bias without including problem variables?

Hi All, I asked something similar earlier but I don't think I was very clear (so I will try again). I want to run a regression, let's say it is...

• Replies: 3
• Views: 4,196
06-26-2013, 02:55 PM
40. ### centered polynomials

in a model involving Y= B0 + B1X1 + B2X2^2, how does centering the model affect the parameters. why does the hypothesis test associated with B2...

• Replies: 1
• Views: 4,195
11-23-2010, 01:01 AM
41. ### Multiple Regression: Dependent Variable has sub-categories

I want to be able to predict Total Spare Part Costs (Y). There are 2 types of spare parts contributing to the total costs. Let Spare Part 1 = SP1...

• Replies: 4
• Views: 4,192
07-31-2011, 06:07 PM
42. ### Dummy coding in linear regression, with an interaction

I am using linear regression with a categorial variable (3 levels of stress manipulation) and continuous variables. I am unsure how to dummy code my...

• Replies: 1
• Views: 4,192
10-30-2013, 09:29 PM
43. ### How to conduct a repeated measures regression with ordinal outcome variable?

Hi, I am trying to predict an ordinal variable (success: 0, 1, 2, 3). I have 3 predictor variables I want to include in the analyses together with...

• Replies: 0
• Views: 4,188
12-04-2010, 04:03 PM
44. ### How can I handle an independent variable with many zeros?

Hey everyone! I'm currently working on my Master's thesis and am slightly stuck in the analytical part. For my research, I am trying to figure out...

• Replies: 3
• Views: 4,188
06-19-2013, 08:25 AM
45. ### Robust regression

Hi, I am trying to use robust regression instead of ordinary least squares since my data set has a lot of outliers but I don't know if I have...

• Replies: 0
• Views: 4,180
03-28-2011, 09:18 PM
46. ### Parameter estimation - which method?

I am new to parameter estimation. It is not clear for me which method is the best to use to estimate parameter of my model: my statistical model has...

• Replies: 14
• Views: 4,177
07-18-2012, 04:06 AM
47. ### Logistic regression - help needed

Hi, I want to predict a dependent variable from a set of (3) factor scores, as independent variables. The problem is that one of those scores...

• Replies: 2
• Views: 4,172
06-19-2011, 01:42 AM
48. ### complex survey analysis and weight variables in proc surveylogistic

I am analyzing the effect of Calcium on Obesity in adults based on the NHANES dataset. I have two questions. First, since I am combining two day...

• Replies: 1
• Views: 4,169
04-18-2011, 11:05 AM
49. ### statistical analysis of global warming/fossil fuels

Hello, I have to write a paper for a class (environmental management). I've been thinking quite a bit about global warming/weather trends and how...

• Replies: 0
• Views: 4,157
01-11-2008, 08:14 PM
50. ### 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: 4,157
08-11-2010, 05:24 PM
51. ### problem with independent variables

Hello, I need your advice. I have a data file, with a binary dependent variable and some independent ones. For each person (case), there were 3...

• Replies: 4
• Views: 4,155
08-20-2010, 09:12 PM
52. ### dummy coding help for cat variables

I have a questionnaire with 28 items - 20 items are Likert attitude questions. In fact there are 5 main variables (constructs?) being measured by 4...

• Replies: 0
• Views: 4,153
12-06-2006, 07:26 PM
53. ### How to develop a regression expression using factor scores?

Hi, I have four factors for fourteen variables. I want to develop a regression expression for a dependent variable using the correlated variables....

• Replies: 1
• Views: 4,148
01-23-2007, 10:05 PM
54. ### generalized least squares

Hello. How can I modify least square linear regression method in order to fit a straight line to data with non gaussian error (such as Levy, Poisson...

• Replies: 6
• Views: 4,148
08-02-2007, 05:53 AM

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