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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. Math quiz gone horribly wrong...HELP!!!

I have a math quiz that I did so horrible on that the teacher gave me points for getting my name and the date right out of pity. I was so far off on...

• Replies: 0
• Views: 2,820
02-08-2006, 09:07 AM
2. Help with easy stats

Hi guys I desperately need help revising for my STATS module. We have been given practice exam questions but are not given the answers so I can't...

• Replies: 0
• Views: 2,731
04-01-2006, 05:52 PM
3. Multiple regression least square estimation

Can someone show me the equations and the derivation of the least square estimation of multiple linear regression? It would be even greater if...

• Replies: 0
• Views: 3,748
05-20-2006, 11:44 AM
4. Plz Help!!!!!!!!!!!!!!!!!!!:(

HEY GUZ CAN U PLZ HELP ME ON THSES @ PROBLEMS< PLZZZ. 1. Please derive solution of parameter estimation for Multiple Linear Regression Model....

• Replies: 0
• Views: 2,642
kal
06-11-2006, 07:41 PM
5. regression, pairs of random variables

with observations of an x variable, and a y variable whose expected values lie on a straight line, and whose residual errors are normally...

• Replies: 0
• Views: 3,268
08-06-2006, 12:25 PM
6. Durbin watson

:confused: :confused: i'm in a big big problem? i'm a demonestrator in medical statistics department this week i have to prepare a seminar about...

• Replies: 0
• Views: 3,862
08-27-2006, 03:34 AM
7. Help with prediction interval problem

Construct the indicated prediction interval for an individual y. The equation of the regression line for the paired data below is = 3x and the...

• Replies: 0
• Views: 7,308
11-13-2006, 02:50 PM
8. 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: 4,072
12-06-2006, 07:26 PM
9. Doing logistic regression using epi-info

Hi there! I'd really appreciate help with this one. I'm finding the prevalence of anemia and its determinants. There are about 23 factors that...

• Replies: 0
• Views: 6,711
12-10-2006, 05:01 AM
10. Interaction variable in regression

I'm analyzing data from an experiment in which there are two groups of subjects (patients and controls), and in each group the independent variable...

• Replies: 0
• Views: 2,870
01-31-2007, 02:28 PM
11. Ancova

Hello, I'm trying to compare regression models of the same form between three groups. Each model has two continuous independent variables. I need...

• Replies: 0
• Views: 2,150
04-17-2007, 09:23 AM

1.A study has been conducted to determine whether the mean spending for recreational activities during the month of August differs for residents of...

• Replies: 0
• Views: 3,659
04-23-2007, 12:20 AM
13. Need my answers checked.. Am I right? Fingers crossed : )

Hey everyone, tomororw morning I am doing a statisctics exam but I had a few questions before I go in there. I have been reviewing the slides from...

• Replies: 0
• Views: 2,206
05-15-2007, 06:00 PM
14. More than 1 squared term in a regression equation?

If I have a multiple regression model in which there are more than 1 or 2 terms that are non-linear with the dependent variable Y, then what can I do...

• Replies: 0
• Views: 2,851
10-19-2007, 11:34 AM
15. Regression and metric space

Hi, I have two independent variables X and Y and one dependent variable Z. X alone explains 45 percent of the variation in Z (Rsquare) and Y...

• Replies: 0
• Views: 3,356
10-29-2007, 03:40 PM
16. Regression Analysis Assignment

:confused: hi all! I'm new here but I sort of need some help. I have this regression analysis assignment to do using SPSS and stats knowledge...

• Replies: 0
• Views: 5,149
11-05-2007, 09:44 AM
17. Cluster Analysis

Hi all, I have a small sample of 75 participants. I'm conducting an exploratory study looking at psychological distress and gender role...

• Replies: 0
• Views: 2,801
11-29-2007, 11:26 AM
18. 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: 4,115
01-11-2008, 08:14 PM
19. what I dont get about statistical techniques!

I bought and read a book about multiple regression analysis (least squares) and it contains tests for each assumptions and not just linear models,...

• Replies: 0
• Views: 2,533
01-11-2008, 10:34 PM
20. Multiple Regression Analysis of a time series

Hello everyone! I'm trying to use multiple regression analysis of a time series, but I've run into a problem interpreting the data. First, I've...

• Replies: 0
• Views: 5,857
02-04-2008, 05:48 PM
21. means versus total scores

Hi I have a question about using means versus total scores. Is it better to use one or the other when conducting analyses like multiple regression...

• Replies: 0
• Views: 2,150
02-09-2008, 12:25 PM
22. Multiple Regression Question

Hello, I am examining the association bertween two independent variables and a dependent variable using multiple regression. My dependent variable...

• Replies: 0
• Views: 2,700
03-10-2008, 03:06 PM
23. Regression analysis - normal distribution and linearity

I am using a scale for a paper. The scores are based on 7 questions with Likert-type responses. I want to use it as a dependent variable in a...

• Replies: 0
• Views: 4,033
05-29-2008, 08:32 AM
24. Multiple Regression Equation.

Can someone please tell me if this if correct or not. I'm such an idiot. if i have coefficients of : intercept = -17.514 Food =-0.351...

• Replies: 0
• Views: 2,567
el1
05-29-2008, 07:57 PM
25. Repeated measures in EEG.

Hello, I am currently working on the analysis of an EEG data set. We measured the EEG signal for 170 verbs and 24 subjects in a picture naming...

• Replies: 0
• Views: 3,851
06-12-2008, 07:07 AM
26. 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: 4,381
07-30-2008, 01:23 PM
27. 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: 3,310
09-03-2008, 06:48 AM
28. 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: 2,022
09-20-2008, 12:25 PM
29. 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: 2,352
jts
10-14-2008, 10:05 PM
30. 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: 2,413
10-21-2008, 02:40 PM
31. 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: 2,919
11-05-2008, 04:41 PM
32. 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: 2,174
11-16-2008, 06:04 AM
33. 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: 2,664
01-12-2009, 05:06 PM
34. 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: 3,027
02-24-2009, 05:50 AM
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: 2,718
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: 5,626
03-22-2009, 12:39 PM
37. 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: 2,230
03-30-2009, 11:58 AM
38. 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: 2,964
04-01-2009, 07:24 AM
39. 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: 2,485
04-13-2009, 01:22 AM
40. 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: 3,934
04-18-2009, 03:47 AM
41. 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: 3,848
05-05-2009, 04:53 PM
42. 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: 2,316
05-06-2009, 01:31 AM
43. 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: 2,828
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: 1,946
06-03-2009, 06:06 PM
45. Poisson regression

Hello, Is it possible to do a Poisson regression with only 6 observations? What is the minimum number of observations possible? Giovanna

• Replies: 0
• Views: 3,382
06-18-2009, 05:48 AM

I've been tasked with conducting a statistical analysis and have encountered a few potentially significant problems. As its been quite some time...

• Replies: 0
• Views: 2,391
07-07-2009, 08:21 AM
47. Please explain differences between R and r

Hello, I received my dissertation back with comments from the dean. He flagged the following text and added the following comments: Am I...

• Replies: 0
• Views: 8,237
07-17-2009, 11:48 PM
48. 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: 4,300
07-23-2009, 04:31 PM
49. Ordinal Logistic Regression and Bimodality

Hello, I'm running ordinal logistic regressions with survey weights. I was under the impression that there are no distributional assumptions for...

• Replies: 0
• Views: 4,338
07-24-2009, 01:28 PM
50. Dependent / conditional regression?

Hi there! Long time lurker, first time poster (first post in ANY board), so my sincerest apologies if I'm doing anything wrong! I have searched...

• Replies: 0
• Views: 2,024
08-11-2009, 05:23 AM
51. help with interpretation of multiple regression results

Dear forum members, I am running multiple regressions with SPSS and I need help with possible interpretation of my results. Firm...

• Replies: 0
• Views: 3,416
09-03-2009, 02:19 AM
52. mahalanobis distance critical values > 10 df

dear all, analysing my dataset (N=1056) with SPSS for my Ph.D., I'm currently testing with linear multiple regression. before entering a...

• Replies: 0
• Views: 10,799
09-03-2009, 09:58 AM
53. predicting X using multiple regression?

Hello: I have been reviewing a study in which Multiple Linear Regression (MLR) was used to evaluate the relationship between the concentration of...

• Replies: 0
• Views: 2,048
09-11-2009, 04:56 PM
54. Time-series analysis with three variables

:wave:I have some time-series across three variables. I want to see the association of two variables while controlling for a third. I am using SPSS...

• Replies: 0
• Views: 3,468
10-13-2009, 08:26 AM
55. Latent growth process

Hi, I'm starting a study investigating the use of several medical imaging measurements taken pre-treatment to predict treatment outcome. Treatment...

• Replies: 0
• Views: 1,577
10-15-2009, 03:51 PM

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