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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### logistic regression question

Hi everyone, If you please advise me why in logitic regression if we have one dependent (binary) and 4 continuous variables, the r value is +ve...

• Replies: 2
• Views: 2,765
10-22-2011, 05:10 PM
2. ### Interpreting regression coefficients (transformed)

Hello, I ran a GLM (poisson) analysis and have a list of my coefficients with their SEs. I need help interpreting the betas because the predictor...

• Replies: 14
• Views: 21,954
10-20-2011, 01:33 AM
3. ### Asymmetric confidence bands in nonlinear regression

Hi, I would like to know the formula for asymmetric confidence bands in nonlinear regression. Figure 6 on this webpage is exactly what I'm looking...

• Replies: 0
• Views: 2,522
10-19-2011, 02:43 PM
4. ### Centered simple betas should be =?

I'm reading Aiken and West Multiple Regression: Testing and Interpenetrating Interactions (p. 33-34) Assume CENTERED means: X_i-\bar{X}_i They...

• Replies: 2
• Views: 2,264
10-18-2011, 08:09 PM
5. ### Sum of Squares Model Proof

I'm attempting the proof of the sum of squares model. I'm not exactly sure where to start but this is what I have to prove. sumYhati^2 = nYbar^2...

• Replies: 1
• Views: 5,144
10-16-2011, 06:35 PM
6. ### How to run Multivariate regression model w/ lags in R

Hello everyone, great resource here! I have done some googling and searching of forums, but I cant seem to find how to run a regression like the...

• Replies: 1
• Views: 3,032
10-15-2011, 08:40 PM
7. ### Bootstrapping confidence intervals for prediction based on SE of the coefficients?

Is it remotely legitimate to use the standard errors of the coefficients from linear regression in a Monte Carlo simulation to bootstrap 2.5%/97.5%...

• Replies: 0
• Views: 1,556
10-15-2011, 08:35 PM
8. ### Drawing polynomial out of regression results table of a fixed effects regression

Dear all, maby its a simple question but I could not find a compelling answer in books or papers: I run a fixed effects regression giving me a...

• Replies: 3
• Views: 2,776
10-15-2011, 04:06 PM
9. ### Correlation Coefficient

Suppose X is transformed to cX, and Y is transformed to dY where c and d are constant, what happens to the correlation coefficient?? Is it...

• Replies: 0
• Views: 1,685
10-14-2011, 04:50 AM
10. ### Small question regarding linear mixed effect model

Thanks so much for reading my post. I've listed key points below. Hopefully once completing reading my problem will become clear. X is an...

• Replies: 0
• Views: 1,826
10-13-2011, 10:49 PM
11. ### Least Square Estimators

When we only have sample size of 2,can we still calculate the least squares estimators for alpha and beta? ?

• Replies: 3
• Views: 1,894
10-13-2011, 06:43 PM
12. ### Ways of showing for bivariate data

Hello, What are the ways of showing that the bivariate date fits the simple regression model? One of the ways is showing the correlation between...

• Replies: 2
• Views: 2,775
10-13-2011, 01:40 PM
13. ### GLM help with interactions

I have a regression model I am trying to build using GLM. I have a continuous response variable, a main variable of interest that is dichotomous and...

• Replies: 1
• Views: 2,534
10-11-2011, 04:47 PM
14. ### P Values on the Intercept

Hi, I have done a regressional analysis of a data set based on promotions to test the hypothesis that a specific qualification / specialisation...

• Replies: 2
• Views: 4,390
10-11-2011, 01:38 PM
15. ### prediction using training data != training data

(Full disclosure: This is a cross-post from the Kernel Machines Forum) I'm using LIBSVM for regression analysis and, despite double checking my...

• Replies: 2
• Views: 2,641
10-09-2011, 11:29 PM

Hi could could someone please help me understand this regression logic to find a conditional variance in a polynomial least squares regression ? X...

• Replies: 0
• Views: 1,914
10-07-2011, 05:26 PM
17. ### Regression analysis of Likert Scale

Hi all, I'm new to this site and conducting research in Physical therapy. I'm attempting to analyze data from surveys with likert scale...

• Replies: 1
• Views: 3,725
10-07-2011, 03:08 PM
18. ### Stupid Q: Interpretation of slope in OLS

Hi ppl I'm running a bunch of regressions on a series of stock returns (decimal values). One of the models is: r_t = a0 + b1*rm_t + e ...

• Replies: 4
• Views: 2,971
10-07-2011, 12:02 PM
19. ### Moderation - help!

** Oops I meant to post this is the 'Psychology Statistics' forum. I've posted there, but cannot figure out how to delete this thread. Apologies for...

• Replies: 2
• Views: 2,231
10-06-2011, 06:19 AM
20. ### Need Urgent help in Kruskal's relative importance

Hi, My client wanted us to perform Kruskal's relative importance technique on some of their modeling work. We have reviewed lot of literature and...

• Replies: 2
• Views: 6,559
10-04-2011, 11:01 AM
21. ### The Connection between conditional expectation and unconditional expectation

William Greene, Econometric Analysis, 7th edition, 20th page: The zero conditional mean implies that the unconditional mean is also zero, since E...

• Replies: 3
• Views: 12,417
10-02-2011, 02:18 PM
22. ### why is the covariance of my residuals not 0?

hello there. i am trying to wrap my head around the assumption that, in regular OLS regression, the covariance of the residuals is 0. i worked out a...

• Replies: 11
• Views: 8,623
09-30-2011, 12:41 PM
23. ### Binomial GLMM, no variance in some groups

Hey! I have a dataset, but I'm having big problems with it. For my research, I basically do some learning trials, and afterwards test for...

• Replies: 0
• Views: 1,803
09-30-2011, 08:37 AM
24. ### Sum of squares proof

Hallo Im tring to prove that correct sum of cross products Sxy = Sum of (Xi)(Yi) - n XiYi given that Sxy = Sum of (Xi - Xbar)(Yi - Ybar). Can you...

• Replies: 4
• Views: 12,161
09-29-2011, 03:22 AM
25. ### logistic regression with quartiles

hi all i have some data that i need to divide into quartiles. after i do this, i will have a predictor variable with 4 categories. i need to do...

• Replies: 0
• Views: 3,244
09-28-2011, 06:19 PM
26. ### Should the standard error (SE) of the best-fit coefficients be propagated?

Hi all, This is how I understand it. Please correct me if I’m wrong: When fitting models to experimental data the statistical software produces...

• Replies: 0
• Views: 2,117
09-28-2011, 07:06 AM
27. ### Different Time Intervals with Logistic Regression

Is it possible to use different time intervals with logistic regression? Let's say I was trying to predict a binary dependent variable (0,1) based...

• Replies: 1
• Views: 2,460
09-28-2011, 12:27 AM
28. ### Autoregression w/ Point Process?

I would like to generate something akin to an ARX model of a quasi-sinusoidal continuous time series, but my exogenous variable is a binary (0-or-1)...

• Replies: 0
• Views: 1,607
09-27-2011, 09:00 PM
29. ### Assumptions that underlie a regresion model

Are there any statistical tests that i can use to evaluate whether the assumptions for the regression model are being met? The assumptions i want...

• Replies: 4
• Views: 3,121
09-26-2011, 11:52 AM
30. ### Regression Line Help

I have an problem and I have a ton of numbers but I am not sure how they go into the questions.... Hours: 0, 1,1,2,3,3,5,5,5,6,6,7,7,9,10 Score:...

• Replies: 1
• Views: 2,634
BGM
09-26-2011, 04:17 AM
31. ### Probably a dumb question...

I have been using R to code my analyses for my research projects, and unfortunately my statistics background is sparse and ancient; please pardon me....

• Replies: 1
• Views: 2,344
09-24-2011, 01:00 PM
32. ### Multiple Linear Regression for Categorical and Continuous data Independent Variable

Dear all, I need to analyze the relationship of DV and IV. I have Dependent variable in continuous data. And i have around 22 independent...

• Replies: 2
• Views: 12,602
09-22-2011, 10:17 PM
33. ### Simple guidance needed (regression & interaction terms) plz

Hi guys - I've been searching around online for a while and even have a textbook but I'm still confused and require guidance from someone. Running...

• Replies: 3
• Views: 2,359
09-21-2011, 12:37 PM
34. ### linear regression through the origin

Hi, I have to find a linear model, I've tried a lot of models but all of them gave me R^2 adj= 0,4. The model without the intercept gave me R^2...

• Replies: 0
• Views: 1,669
09-21-2011, 07:16 AM
35. ### My GRS statistic value is coming out to be weird.

I am calculating GRS F-statistic on excel. Howeve rthe value is coming out to be either veyr big in trillions or too small. I guess the problem...

• Replies: 0
• Views: 3,324
09-21-2011, 06:48 AM
36. ### Any software to get sample size/power analysis for probit regression?

Hi All, I need to figure out sample size for an upcoming study that will utilize a probit regression to test agreement of a new diagnostic test to...

• Replies: 12
• Views: 7,939
09-19-2011, 12:06 PM
37. ### significant nonlinear curve

Hello, For linear regression we have R² that help as to know if x and y are correleted, and p-value if my correlation is significant. How can I...

• Replies: 1
• Views: 2,523
09-17-2011, 12:18 PM
38. ### Need help on a regression problem

Hi guys, I got a degree in statistics but I'm pretty rusty since I haven't touched it for over 5 years. Hope someone can help. :) Basically I have...

• Replies: 5
• Views: 1,926
09-16-2011, 01:21 PM
39. ### Novice needs help with Maximum Likelihood Estimation of Logit Model

Hi all, I’d be grateful for some help. I realise this is perhaps elementary stuff for many but as someone without a formal statistics background, I...

• Replies: 3
• Views: 3,431
09-16-2011, 09:21 AM
40. ### Panel Data Regression (xtreg) STATA

Hello everyone, I'm running a pooled tiem series regression with random effects. It runs fine and I'm having a problem interpreting results. I'm a...

• Replies: 0
• Views: 6,317
09-15-2011, 09:24 PM
41. ### Independence of irrelevant alternatives test

Hi, I'm looking for to test to see if my logistic regression model violates the independence of irrelevant alternatives assumption. The most often...

• Replies: 0
• Views: 3,283
09-15-2011, 10:47 AM
42. ### Software Application Regression

Hello here is my problem: I would like to perform a regression analysis to examine parts of my company's software application. I would like to...

• Replies: 0
• Views: 2,097
09-13-2011, 07:16 PM
43. ### Group size analysis over time

Hi, I was wondering if anyone could help me please. I am looking at how group size changes with the amount of food available in a group of...

• Replies: 0
• Views: 1,955
09-13-2011, 08:21 AM
44. ### Regarding negative correlation and negative variance estimation result

In ANOVA, we sometimes talk about that variance estimation can get negative result when there is negative correlation. I do not understand what...

• Replies: 8
• Views: 5,270
09-12-2011, 11:32 PM
45. ### Logistic Regression

I am having difficulty performing logistic regression in SPSS due to missing data. Any suggestions for controlling for missing data in logistic...

• Replies: 3
• Views: 2,516
09-11-2011, 08:14 PM
46. ### IQ/achievement test correlation (rxy)

Working on creating new regression tables for determining the presence of learning disabilities. In order to do this, I need to determine a...

• Replies: 1
• Views: 4,800
09-09-2011, 04:02 PM
47. ### Multivariate regression with non-linear effect on dependent variable

Hi all, I'm looking for an appropriate technique for a problem I'm trying to solve. I have a dependent variable that is count data - number of...

• Replies: 1
• Views: 1,488
09-09-2011, 03:14 PM
48. ### Fit a non-recatngular parabola in R

Hello, I'd like to fit the formula below to a non-rectangular parabola in R. C = (XI+A-√((ϕI+A )^2-4XϕIA))/2X-R I have several data points...

• Replies: 0
• Views: 4,289
09-08-2011, 10:01 PM
49. ### Missing time points in Cox Regression

Hi, I'm pretty new to the forum so please excuse if I bring up something old. I have searched for an answer but have not found anything about it. ...

• Replies: 2
• Views: 2,499
09-07-2011, 03:55 PM
50. ### Logistic Regression and Multiple Regression

Hi, Please could you help me (or direct me to someone who can help me) with the following: I have a spreadsheet with a number of...

• Replies: 13
• Views: 3,866
09-07-2011, 10:17 AM
51. ### Is it a sensible practice to collapse categories of a predictor?

I used logistic regression to run a model. An explanatory variable called 'region' has 3 levels (1, 2, 3). Level 3 is the reference group. The...

• Replies: 2
• Views: 3,337
09-07-2011, 10:07 AM
52. ### looking for a way to check possible mediation in regression

Hi all, My research includes child-parent talk, and I have four main variable types: 1-Child talk 2-Child perceptions 3-Parent talk 4-Parent...

• Replies: 0
• Views: 1,703
09-07-2011, 02:26 AM
53. ### Lmer Output/: variable re-levelling

Morning/Evening all I'm having a bit of a time getting the LME4 package to list ALL of my IVs, rather than all-1. By way of example, here is my...

• Replies: 7
• Views: 6,117
09-06-2011, 06:56 AM
54. ### Multinomial hierarchical logistic regression

Hi everyone! I am wondering if anyone could help me to understand multinomial logistic regression. I am trying to do similar hierarchical...

• Replies: 1
• Views: 2,969
09-05-2011, 05:42 AM
55. ### Forward selection

As most of you probably know, forward selection is a method of model selection that involves introducing independent variables into your model one by...

• Replies: 1
• Views: 2,852
09-04-2011, 04:10 PM
56. ### Covariance of residual

I'm given the mutiple regression equation Y = XB + e I have to find the covariance between e_hat and Y First what I did was changed e_hat =...

• Replies: 0
• Views: 3,656
09-03-2011, 08:52 PM
57. ### Changes in the level of Significance

I use standard errors for significance. Basically there is no problem with the significance, the problem is how to interprete the results. The...

• Replies: 2
• Views: 2,480
dou
09-02-2011, 04:45 AM
58. ### Which statistical test should I use?

I am struggling with my dissertation, as having collected my data, I am unsure of which test to use. I am investigating the differences in imagery...

• Replies: 4
• Views: 4,878
09-01-2011, 02:15 PM

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