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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Nonparametric multivariate survey analysis - suggestions please!

Hi I'm about to start analysis on some educational survey data with the following predictor and response variables: PREDICTOR: age class (2...

• Replies: 2
• Views: 2,225
08-02-2009, 04:27 PM
2. ### Which test to use?

I have just learned that I chose the wrong test for my data and I am now at a total loss. Basically I sent out a questionnaire which had a likert...

• Replies: 3
• Views: 2,363
08-01-2009, 02:44 AM
3. ### Calculating Omega Squared

Hi All I have been battling with my stats over the last two months and have managed, by reading books and researching the web, to stumble through...

• Replies: 2
• Views: 26,041
07-28-2009, 10:25 AM
4. ### 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: 4,374
07-24-2009, 01:28 PM
5. ### 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: 4,345
07-23-2009, 04:31 PM
6. ### 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: 8,348
07-17-2009, 11:48 PM
7. ### Logistic regression vs multiple regression

I have a 3 predictor variables that I am using to predict participation rates. How do I determine whether to use logistic regression or multiple...

• Replies: 1
• Views: 6,370
07-15-2009, 07:54 PM
8. ### Factorial ANOVA

I am not sure if what i am about to ask would make complete sense so let me start from the beginning. I'm doing research to measure five different...

• Replies: 2
• Views: 3,053
07-15-2009, 06:49 AM
9. ### Web Analyst: Been a While Since I Touched Stats

Hey everyone, I joined up to this site looking to get some advice. I have been doing web analytics for just over 2 years now. I have an...

• Replies: 5
• Views: 2,714
07-08-2009, 08:23 PM

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: 2,427
07-07-2009, 08:21 AM
11. ### what is the best model to use?

I have been working on this project for over 4 months. My model was approved by supervisor. The model was to run a multinomial logistic regression to...

• Replies: 1
• Views: 1,980
07-05-2009, 11:40 AM
12. ### Best laid plans...

My thesis design was to give participants 2 tests. One measures a personal "type" and the other asks "opinions". My manipulation was to reverse...

• Replies: 12
• Views: 3,571
06-24-2009, 04:04 PM
13. ### Multiple chi-square or logistic regression?

Hi, I'm new to statistics and am working on a project for work. I have read extensively and believe I am on the correct path, but would like to...

• Replies: 1
• Views: 6,671
06-22-2009, 07:36 PM
14. ### variance-stabilizing transformation for simple linear regression

studying for a test.. need some help. Consider a simple linear regression analysis with β0 and β1 both positive. Suppose that the mean of the...

• Replies: 1
• Views: 3,935
06-21-2009, 06:43 PM
15. ### Regression SS in multiple linear regression

In MULTIPLE linear regression, is it still true that the regression sum of squares is equal to ∑ (Y_i hat -Y bar)^2 ??? My textbook defines...

• Replies: 3
• Views: 5,591
06-20-2009, 04:55 PM
16. ### Multiple linear regression: partial F-test

"Suppose that in a MULTIPLE linear regression analysis, it is of interest to compare a model with 3 independent variables to a model with the same...

• Replies: 5
• Views: 20,669
06-20-2009, 11:32 AM
17. ### Sum of the residuals in multiple linear regression

In my textbook, the following results are proved in the context of SIMPLE linear regression: ∑e_i = 0 ∑(e_i)(Y_i hat)= 0 I tried to modify the...

• Replies: 1
• Views: 7,482
06-20-2009, 07:28 AM
18. ### Cov in multiple linear regression

For multiple linear regression model Y = Xβ + e, assume X is non-random. Assume Gauss-Markov assumptions hold. Show that variance-covariance matrix...

• Replies: 3
• Views: 5,367
06-19-2009, 09:32 PM
19. ### 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: 3,429
06-18-2009, 05:48 AM
20. ### 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: 3,034
06-15-2009, 07:01 PM
21. ### 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: 12,398
06-04-2009, 08:24 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: 1,963
06-03-2009, 06:06 PM
23. ### 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: 2,846
05-30-2009, 09:55 PM
24. ### 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: 16,615
05-27-2009, 10:39 AM
25. ### Linear Regression Models (2)

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

• Replies: 12
• Views: 4,486
05-22-2009, 03:35 PM
26. ### Linear Regression Models (3)

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

• Replies: 4
• Views: 3,255
05-19-2009, 08:03 PM
27. ### 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: 2,619
05-19-2009, 08:02 PM
28. ### 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: 14,286
05-07-2009, 01:50 AM
29. ### 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: 2,356
05-06-2009, 01:31 AM
30. ### 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: 3,905
05-05-2009, 04:53 PM
31. ### 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: 2,935
05-03-2009, 06:02 PM
32. ### 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: 3,363
05-03-2009, 06:01 PM
33. ### 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: 2,586
04-29-2009, 09:36 PM
34. ### 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: 2,847
04-18-2009, 07:21 PM
35. ### 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: 3,981
04-18-2009, 03:47 AM
36. ### 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: 2,517
04-13-2009, 01:22 AM
37. ### 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: 2,667
04-10-2009, 02:39 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: 2,995
04-01-2009, 07:24 AM
39. ### 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: 2,256
03-30-2009, 11:58 AM
40. ### 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: 4,326
03-25-2009, 07:42 PM
41. ### 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: 5,722
03-22-2009, 12:39 PM
42. ### 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: 2,764
03-21-2009, 07:30 AM
43. ### 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: 22,049
03-20-2009, 11:49 PM
44. ### 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: 3,762
03-12-2009, 05:47 PM
45. ### 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: 2,562
03-10-2009, 07:51 AM
46. ### 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: 11,907
03-03-2009, 05:06 PM
47. ### 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: 5,949
03-01-2009, 09:28 PM
48. ### 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: 4,784
02-26-2009, 11:57 AM
49. ### 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: 3,041
02-24-2009, 05:50 AM
50. ### 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: 4,536
02-18-2009, 10:19 PM
51. ### 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: 4,580
02-16-2009, 08:43 PM
52. ### 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: 2,079
02-15-2009, 03:35 PM
53. ### 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: 3,288
02-13-2009, 02:12 AM
54. ### 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: 3,575
02-09-2009, 01:00 PM
55. ### 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: 3,741
02-08-2009, 11:31 AM
56. ### 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: 2,826
02-01-2009, 10:04 AM

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