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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### 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: 5,615
11-26-2008, 06:58 PM
2. ### 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: 3,012
11-26-2008, 08:13 PM
3. ### 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: 25,919
11-29-2008, 11:29 AM
4. ### 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: 21,361
11-30-2008, 09:08 PM
5. ### 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: 2,292
12-01-2008, 03:14 AM
6. ### 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: 13,288
12-05-2008, 03:40 PM
7. ### 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: 5,666
12-08-2008, 03:33 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: 2,889
12-10-2008, 11:14 PM
9. ### 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: 4,357
12-15-2008, 11:23 PM
10. ### 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: 23,100
12-16-2008, 03:21 AM
11. ### 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: 4,860
12-17-2008, 12:21 PM
12. ### 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: 4,875
12-22-2008, 09:04 AM
13. ### 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: 3,034
12-23-2008, 06:09 PM
14. ### 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: 2,422
12-24-2008, 07:46 AM
15. ### 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: 3,272
01-04-2009, 03:42 PM
16. ### 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: 2,674
01-12-2009, 05:06 PM
17. ### 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: 5,512
01-15-2009, 08:43 AM
18. ### 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: 3,119
01-20-2009, 06:33 AM
19. ### "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: 3,936
Axl
01-22-2009, 03:05 PM
20. ### 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: 2,419
Axl
01-28-2009, 03:13 PM
21. ### 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: 2,807
02-01-2009, 10:04 AM
22. ### 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: 3,722
02-08-2009, 11:31 AM
23. ### 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: 3,552
02-09-2009, 01:00 PM
24. ### 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: 3,266
02-13-2009, 02:12 AM
25. ### 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: 2,067
02-15-2009, 03:35 PM
26. ### 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: 4,556
02-16-2009, 08:43 PM
27. ### 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: 4,499
02-18-2009, 10:19 PM
28. ### 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: 3,034
02-24-2009, 05:50 AM
29. ### Linear Regression in Excel...

Hello everyone ! If you don't mind, a question regarding linear regression in Excel. I will be having a an Intro to Statistics test in May and...

• Replies: 4
• Views: 4,758
02-26-2009, 11:57 AM
30. ### Double check sample calculation from pilot study

I am really a neophyte to statistics but am in the middle of a research project and would appreciate someone checking my calculations. I ran a...

• Replies: 3
• Views: 5,915
03-01-2009, 09:28 PM
31. ### multiple regression - beta coefficient - beta above 1

Hey, I have a problem concerning multiple regression analyses and the beta coefficient. I conducted a multiple regression analysis with two...

• Replies: 1
• Views: 11,846
03-03-2009, 05:06 PM
32. ### Adjusting survey data that is taken at diffrent timepoints

Hi all, I am trying to analyze the differences between two groups in the result of a psychometric survey after they have been affected by a...

• Replies: 2
• Views: 2,540
03-10-2009, 07:51 AM
33. ### Regression for nominal variables?

well, i'm interested if there is some kind of procedure, similar to multiple regression to calculate results for nominal variable with more than two...

• Replies: 1
• Views: 3,719
03-12-2009, 05:47 PM
34. ### Three way interactions in regression

Hi, I'm trying to figure out how to do three-way interactions with multiple regression. I am trying to predict an IV by a three DVs and the...

• Replies: 4
• Views: 21,962
03-20-2009, 11:49 PM
35. ### Prediction interval behaviour close to the origin

Hi I have a simple linear regression model, for which I have calculated the Confidence and Prediction Intervals. The model is fixed at the origin...

• Replies: 0
• Views: 2,730
03-21-2009, 07:30 AM
36. ### Confidence Interval for Prediction in Weighted Regression

Hi everyone, I'm currently writing my final year project in analytical chemistry, and have got to the stage of calculating confidence intervals...

• Replies: 0
• Views: 5,679
03-22-2009, 12:39 PM
37. ### 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: 4,297
03-25-2009, 07:42 PM
38. ### Simple Questions

...and yet i'm stuck. 1) How would you represent the components of ANOVA of regression in a graphic format,when considering a bivariate...

• Replies: 0
• Views: 2,243
03-30-2009, 11:58 AM
39. ### SPSS multiple regression????

I want to do a multiple regression , correlating offspring produced on mating one with offspring produced on mating two also with male age at the...

• Replies: 0
• Views: 2,978
04-01-2009, 07:24 AM
40. ### Linear Regression and Correlation Q - Need help!

Home Size Selling Price Home Size Selling Price 1.4 100 1.3 110 1.3 110 ...

• Replies: 1
• Views: 2,653
04-10-2009, 02:39 AM
41. ### Multiple Regression where DV is a proportion

Hi. I am using multiple regression with 3 continuous predictor Variables, and the Dependent Variables is a proportion (0-1). I'm worrying quite a...

• Replies: 0
• Views: 2,502
04-13-2009, 01:22 AM
42. ### PCA questions

here goes... 1. The Kaiser-Meyer-Olkin Measure of Sampling Adequacy and Bartlett's Test of Sphericity tests are done on the standardised or the...

• Replies: 0
• Views: 3,955
04-18-2009, 03:47 AM
43. ### Urgent help, please...thanks . A.S.A.P

Thanks admin for your ongoing feedback... I am facing this problem with the Leckert Scale...follows: data set to be collected - 5 points:...

• Replies: 3
• Views: 2,829
04-18-2009, 07:21 PM
44. ### Linear Regression Model Help

Hi, I don't really understand how I go about this problem. I understand regression but I need a little help here. Question: Reaction time to a...

• Replies: 2
• Views: 2,559
04-29-2009, 09:36 PM
45. ### Dependent variable kurtosis

How important is it for the Dependent Variable in a multiple regression to show normal distribution? I have read apparently contradictory...

• Replies: 2
• Views: 3,341
05-03-2009, 06:01 PM
46. ### Independent variable kurtosis in multiple regression...

One of my independent variables 'Age' has 10 categories of ages, each with an equal number of individuals. What do I need to do to this to make it...

• Replies: 1
• Views: 2,897
05-03-2009, 06:02 PM
47. ### Poisson regression with interactions

I am investigating the risk of getting different forms of leukemia if you live near a hazardous waste site in New York state. I am working with PROC...

• Replies: 0
• Views: 3,877
05-05-2009, 04:53 PM
48. ### Validity of setting constant to zero

Can anyone tell me the validity of setting the constant term to zero to make the other coefficients pass significance? For example, I have been...

• Replies: 0
• Views: 2,337
05-06-2009, 01:31 AM
49. ### Interpreting a moderation effect

Yesterday I submitted my firts thread but I learnt that it was too vague. I did my work but now I have some doubts interpreting a moderation effect....

• Replies: 3
• Views: 14,243
05-07-2009, 01:50 AM
50. ### Linear Regression Models (1)

1) "In regression models, there are two types of variables: X = independent variable Y = dependent variable Y is modeled as random. X is...

• Replies: 1
• Views: 2,606
05-19-2009, 08:02 PM
51. ### Linear Regression Models (3)

β ε note: also under discussion in "Math Help Forum"

• Replies: 4
• Views: 3,218
05-19-2009, 08:03 PM
52. ### Linear Regression Models (2)

β ε note: also under discussion in "Math Help Forum"

• Replies: 12
• Views: 4,464
05-22-2009, 03:35 PM
53. ### Linear Regression: reversing the roles of X and Y

Simple linear regression: Y = β0 + β1 *X + ε , where ε is random error Fitted (predicted) value of Y for each X is: ^ Y = b0 + b1 *X (e.g....

• Replies: 4
• Views: 16,563
05-27-2009, 10:39 AM
54. ### hierarchical multiple regression

Hi guys, I'm pretty clueless when it comes to stats, so I was wondering if you could help. I'm testing 2 competing theories on personality causes...

• Replies: 0
• Views: 2,836
05-30-2009, 09:55 PM

Suppose that you wish to use a linear regression to predict the dependent variable Y using the dependent variable X1. You collect a scatter plot of...

• Replies: 0
• Views: 1,952
06-03-2009, 06:06 PM
56. ### linear regression model: LSE, Var, Cov etc

Studying for a test.. can anyone check my solutions for (a)-(c) and give me any help on (d)? Any help would be appreciated. Consider the model Yi...

• Replies: 2
• Views: 12,352
06-04-2009, 08:24 PM
57. ### Did I do this correctly?

Hi, I am trying to forecast electric power demand for natural gas in the near future. A huge driver of electric power demand for natural gas on a...

• Replies: 5
• Views: 3,021
06-15-2009, 07:01 PM

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