1. 10-14-2010
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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### pearson correlation in linear mixed models?

Hi, I'm trying to understand a research article that used linear mixed models, and I think they have done something wrong. Basically, the...

• Replies: 0
• Views: 2,330
02-24-2009, 05:50 AM
2. ### This simple linear regression isn't adding up..

Edit/Cliffnotes: CORRECTION- The second SSR formula in question is SSR = SUM((yhat(i) - ybar)^2), not SSR = SUM((y(i) - ybar)^2). Dragan resolved my...

• Replies: 2
• Views: 2,730
02-18-2009, 10:19 PM
3. ### three way interactions and centering in multiple regression

Hello, I am examining three variables to see whether they interact with each other to predict my DV using multiple regression. I typically center my...

• Replies: 4
• Views: 3,192
02-16-2009, 08:43 PM
4. ### Question About a Seemingly Invalid Sampling

Hi, I was wondering if someone can help me with the following question: Suppose that we were interested in the effects of a prep course on SAT...

• Replies: 1
• Views: 1,300
02-15-2009, 03:35 PM
5. ### multiple comparisons

Hi, I'm a vet doing a research project, but am not really strong in stats. I have a question about whether correction for multiple comparisons is...

• Replies: 8
• Views: 2,367
02-13-2009, 02:12 AM
6. ### Percentage/proportion prediction interval

Hi, anyone could help with this: we know that with a considerably large sample we can estimate what is the proportion of cases having a certain...

• Replies: 1
• Views: 2,357
02-09-2009, 01:00 PM
7. ### Comparing regression equations

I am thinking of trying to use the logit model to determine the probability of whether patients will participate in a particular health program. My...

• Replies: 2
• Views: 2,209
02-08-2009, 11:31 AM
8. ### Linear Regression Models

I am being asksed if an equation is linear in the paramenters or variables and I am a bit lost. I understand that for something to be linear it cant...

• Replies: 1
• Views: 1,725
02-01-2009, 10:04 AM
9. ### Risk Model Re-Weighting Help Needed

Long story somewhat short … My company uses a risk model with 10+ variables. Each of these variables is weighted according to the risk it...

• Replies: 2
• Views: 1,661
Axl
01-28-2009, 03:13 PM
10. ### "Best" Multiple (Multivariate) Nonlinear Regression?

Hi all, I'm just getting started in R. I've had good luck finding the right (predictive) correlation weights using orthogonal polynomials in Java....

• Replies: 2
• Views: 2,913
Axl
01-22-2009, 03:05 PM
11. ### Stats analysis help would be very much appreciated

I have carried out some research. The research involved respondents filling in a questionnaire of 62 questions. Answers were on a scale - Strongly...

• Replies: 4
• Views: 2,114
01-20-2009, 06:33 AM
12. ### Logistic regression or DFA?

Hi! I am trying to get my masters thesis done. I am taking a statistics course right now, but I need to get started on things sooner rather than...

• Replies: 3
• Views: 4,301
01-15-2009, 08:43 AM
13. ### Unbalanced Sample Sizes

Given two variables: one is a single estimate measured on one individual, the other is comprised of multiple samples taken from the same individuals...

• Replies: 0
• Views: 2,094
01-12-2009, 05:06 PM
14. ### Statistical Significance

I am completing a statistics project having been given data for 30 years. I have calculated the pairwise correlation coefficients between Infant...

• Replies: 2
• Views: 1,926
01-04-2009, 03:42 PM
15. ### multiple regression analysis on likertscale

Dear All, I am doing the analysis of my data obtained through a questionaire. i want to find the relationship of different forms justice...

• Replies: 1
• Views: 1,545
12-24-2008, 07:46 AM
16. ### Linear regression

Hi all I was given a data sample of 35 countries which included the country name,the number of railways and the number of airports in the given...

• Replies: 6
• Views: 2,246
12-23-2008, 06:09 PM
17. ### Multiple logistic Regression Power Analysis

Hi to everybody, Please does anybody can help me to solve this problem? I have a multiple logistic regression model with more than one BINARY...

• Replies: 1
• Views: 3,532
12-22-2008, 09:04 AM
18. ### 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: 3,568
12-17-2008, 12:21 PM
19. ### Binary Logistic Regression in R

Warning: this is going to be a long post. Acknowledgement: Thanks to The Ecologist for getting me started on what I hope is the right road. This...

• Replies: 24
• Views: 19,274
12-16-2008, 03:21 AM
20. ### adjusting a proportion score (controling for age)

I have 20 yes/no ratings (did this product help you). People were able to rate as many of the 20 products as they used (on average people rated 5...

• Replies: 8
• Views: 3,010
12-15-2008, 11:23 PM

Hello, I was wondering if you could please offer any advice as I appear to have got rather muddled. I am writing a resesarch proposal, and I...

• Replies: 8
• Views: 2,115
12-10-2008, 11:14 PM
22. ### Can you guys check these for me

Shade answers to T/F questions and type letter answer to multiple choice questions next to problem number. Chapters 13 & 14 included. T F 1. If a...

• Replies: 1
• Views: 3,767
12-08-2008, 03:33 PM
23. ### Multiple Regression & Multiple Linear Regression: 2 Qu's

I know these are 2 very basic question, but if someone could please confirm them for me I'd be very grateful indeed: 1. Am I correct in thinking...

• Replies: 4
• Views: 9,460
12-05-2008, 03:40 PM
24. ### price determination prediction

Its been 2 years since my last statistics class. I did fairly well but the material isn't so fresh since I haven't had to use it. I am writting a...

• Replies: 1
• Views: 1,395
12-01-2008, 03:14 AM
25. ### Did i get theese right i am confused, can anyone help me please

25. In multiple regression analysis, residual analysis is used to test the requirement that A) the variation in the residuals is the same for all...

• Replies: 2
• Views: 19,374
11-30-2008, 09:08 PM
26. ### Testing for difference 2 regression models

Hello, I am working on multiple regressions at the moment and have come to a point that I need a little assistance. I have the following question:...

• Replies: 8
• Views: 22,436
11-29-2008, 11:29 AM
27. ### Looking for mult. linear regression equations

Hi - I'm having trouble finding the equations for the coefficients for a multiple linear regression with two independent variables (a=, b1=, b2=). ...

• Replies: 1
• Views: 1,926
11-26-2008, 08:13 PM
28. ### 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: 3,871
11-26-2008, 06:58 PM
29. ### Independent variables correlate to each other: violation of regression assumoptions?

Ok, so bear with me - total statistical idiot here, in way over his head. I'm running multiple regressions of plant cover against precipitation,...

• Replies: 11
• Views: 11,931
11-19-2008, 10:17 AM
30. ### Help needed with ANOVA analysis

ANOVA df SS MS F Significance F Regression 6 5510.4 918.4 11.67 0.0081 Residual 5 393.2 78.65 Total ...

• Replies: 1
• Views: 2,929
11-18-2008, 03:32 PM
31. ### Two-way ANOVA...or not?

The following data is observed by a building society: No of mortgage applications per month Year 1989 1990 1991 1992 AVERAGE Season...

• Replies: 0
• Views: 1,295
11-16-2008, 06:04 AM
32. ### Muliple regression - lets try again

I posted a question earlier (variable transformation) and am wondering if I didn't explain myself very well. Here's a more straighforward and paired...

• Replies: 2
• Views: 1,703
11-13-2008, 07:26 PM
33. ### Calculations for the unstandardized coefficients for a multiple regression analysis

I am looking to write a spreadsheet of the calculations for the unstandardized coefficients for a multiple regression analysis (the B values). ...

• Replies: 3
• Views: 15,808
11-11-2008, 04:53 AM
34. ### calculating multiple regression by hand

How would you calculate a regression equation such as Y = b1X1 + b2X2 + b3X3 + a by HAND??? I can find in textbooks the way to calculate two...

• Replies: 1
• Views: 17,903
11-11-2008, 12:04 AM
35. ### Factor analysis with non-normal distribution?

Hi all, Does anyone know an alternative to factor anlysis for non-normal distrbutions which explores factors or clusters on a set of 64...

• Replies: 3
• Views: 12,565
11-06-2008, 02:26 PM
36. ### multiple comparison issue in linear regression

I am puzzled by the following question: If you have a 3-level categorical predictor in a linear regression model, you will get 2 estimated...

• Replies: 0
• Views: 1,939
11-05-2008, 04:41 PM
37. ### Is there any limitation on number of predictors if I run stepwise linear regression

Hi... I need help to solve a problem actually i want to do stepwise linear regression and my predictors are 2279 (differenct combinations of soil...

• Replies: 0
• Views: 1,398
10-21-2008, 02:40 PM
38. ### Standard Deviation or Response / Prediction - Linear Regression

Hi, I'm hoping someone out there can help me with what is probably a very simple question. For a stats assignment, I've created a linear...

• Replies: 4
• Views: 9,316
10-20-2008, 04:47 AM
39. ### Help!

Hi, I'm in the social sciences (psych) using cross sectional data. I'm completing a multiple hierarchical regression looking at interaction...

• Replies: 3
• Views: 1,433
10-16-2008, 07:49 AM
40. ### Issues with using composites in linear regression?

Hi, What sort of issues do I need to consider if I include composites as independent variables in a linear regression? (The composites are averages...

• Replies: 0
• Views: 1,375
jts
10-14-2008, 10:05 PM
41. ### Repeated measures - appropriate for my study or not?

Howdy folks - first time poster here. I'm a grad student at CU-Boulder working on grassland ecology and need some assistance. I've got six...

• Replies: 1
• Views: 1,805
10-10-2008, 01:23 AM
42. ### Testing suppression with SEM

hey everybody Using multiple regression analysis on my data, I've discovered a suppression effect. Now I started analyzing the same data with...

• Replies: 1
• Views: 4,672
09-30-2008, 10:27 AM
43. ### AM I allowed to do this?

Basically i have a binary variable called DP ( takes values 0 or 1) that i had to drop from my multiple regression due to few observations with of...

• Replies: 1
• Views: 1,484
09-22-2008, 06:06 PM
44. ### brain freeze.....

im having a really stupid moment, but what does it mean when a multiple regression coeffecient is insignificant. say hair colour is found to be...

• Replies: 1
• Views: 1,461
09-22-2008, 09:15 AM
45. ### URGENT POOLD OLS regression

ok basically heres the deal. ive used OLS multiple regression on panel data (so ive used a pooled OLS regression.) what i want to know is whats...

• Replies: 0
• Views: 1,495
09-20-2008, 12:25 PM
46. ### Simple CORRELATION query

hi. i am analysing my data using a correlation matrix, and then multiple regression. I have noticed that some of my correlation co-effecients are...

• Replies: 1
• Views: 1,629
09-19-2008, 12:11 PM
47. ### A quick regression QUESTION

Hi i just have a really simple question regarding multiple regression. i have a independant variable called DPR that is the dividend payout ratio...

• Replies: 2
• Views: 1,649
09-16-2008, 03:10 AM
48. ### Unstandardized regression coefficient in Multiple Regression Interaction

Hi all, I am trying to interpret a significant cross product interaction in a Multiple Regression and I am getting more and more confused. There...

• Replies: 1
• Views: 7,388
09-06-2008, 01:01 AM
49. ### Prediction Limits

Morning everyone. First thread, so take it easy on me. I am using a holt-winters times series to predict future call and transactional volume. ...

• Replies: 0
• Views: 1,693
09-03-2008, 06:48 AM
50. ### Number of IV's in multiple regressions: How many is 'too many'?

Hello I need to run a number of individual regressions and am trying to decide how to break them down. I was wondering whether there is a limit...

• Replies: 2
• Views: 2,730
09-02-2008, 03:51 PM
51. ### very basis question

Hi guys, one very basic question: what is the actual difference between simple linear regression and univariate analysis? examples would be...

• Replies: 3
• Views: 1,656
09-01-2008, 08:25 AM
52. ### Centering and transforming

Hello, I'm performing a multiple regression analysis and have a question about transforming variables. I am using two IVs to see if there are...

• Replies: 1
• Views: 1,695
08-28-2008, 05:05 AM
53. ### how to enter certain data, and should i use t test?

Hi all,:wave: I'm new here and need life saving help with my MEd dissertation! I'm studying moral development (SRMS SCORE) and play opportunities...

• Replies: 2
• Views: 3,072
08-18-2008, 04:38 AM
54. ### Check and develop my answers, multiple regression

This is the question, i was wondering if anyone could check if i did the correct thing, and help me develop my written answers if needed. a)...

• Replies: 4
• Views: 4,633
08-17-2008, 12:49 PM
55. ### Help with Multiple Regression

Hi all, im struggling with what to do with this multiple regression question, any help tips or pointers would be greatly appreciated! Am i...

• Replies: 6
• Views: 2,542
08-16-2008, 12:43 PM
56. ### consulting help needed (will pay)

In about a month, I will be in need of help on some statistical analyses in the following areas: -categorical data analysis -multiple linear...

• Replies: 1
• Views: 1,559
08-12-2008, 02:41 PM
57. ### Multiple Regression

Hi, I am doing regression for dependent variable Y and independent variables X1, X2, X3 and X4. Y is the weekly stock price of a company which...

• Replies: 4
• Views: 1,710
08-06-2008, 03:39 AM
58. ### Meaning of T-Ratio and parameter standard error in HLM analysis

Hello. I've recently used an Hierachical Linear Modeling (HLM aka mixed modeling) analysis method to look at some data. I'm only just beginning to...

• Replies: 2
• Views: 14,473
08-02-2008, 10:34 PM
59. ### effect size in hierarchical multiple regression (categorical predictor)

Hello all So glad to have found this useful forum and have already gotten some clarity on other issues related to the hierarchical regression...

• Replies: 0
• Views: 3,354
07-30-2008, 01:23 PM

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