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Threads 181 to 240 of 4341

Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. 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: 3,434
06-18-2009, 05:48 AM
2. 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: 5,380
06-19-2009, 09:32 PM
3. 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: 7,503
06-20-2009, 07:28 AM
4. 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: 20,712
06-20-2009, 11:32 AM
5. 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: 5,618
06-20-2009, 04:55 PM
6. 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: 3,951
06-21-2009, 06:43 PM
7. 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: 6,677
06-22-2009, 07:36 PM
8. 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: 3,578
06-24-2009, 04:04 PM
9. 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: 1,981
07-05-2009, 11:40 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: 2,440
07-07-2009, 08:21 AM
11. 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: 2,718
07-08-2009, 08:23 PM
12. 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: 3,059
07-15-2009, 06:49 AM
13. 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: 6,389
07-15-2009, 07:54 PM
14. 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: 8,368
07-17-2009, 11:48 PM
15. 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: 4,356
07-23-2009, 04:31 PM
16. 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: 4,391
07-24-2009, 01:28 PM
17. 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: 26,089
07-28-2009, 10:25 AM
18. 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: 2,369
08-01-2009, 02:44 AM
19. 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: 2,227
08-02-2009, 04:27 PM
20. 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: 2,042
08-11-2009, 05:23 AM
21. Using Regression When Y = # Wins

Hello, This is my first post, and so I apologize if this is a dumb question. I'm considering using multiple linear regression to predict Y = #...

• Replies: 2
• Views: 2,436
08-18-2009, 04:43 PM
22. Problem with small amount of cases

Hi New here, and fairly new with statistics. I have a problem with too few cases, but more than enough variables and observations. I have no...

• Replies: 5
• Views: 2,467
Cai
08-19-2009, 12:09 PM
23. 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: 3,456
09-03-2009, 02:19 AM
24. 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: 10,968
09-03-2009, 09:58 AM

Hi guys i need help badly. We were given this to solve in my first RA class and i have no idea how to begin. Please this is the first time i'm...

• Replies: 2
• Views: 3,213
09-06-2009, 09:00 PM
26. 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: 2,079
09-11-2009, 04:56 PM
27. Can I use mediation with my data?

Thanks for taking the time to read this in advance it is quite detailed, but I'm currently working on my psychology honours dissertation, and due to...

• Replies: 2
• Views: 3,442
09-13-2009, 01:27 AM
28. Error estimates with r2 in linear regression

I have been given the results of some regression analysis, where some variable y is a function of x1 and x2. I have a r2 value for the analysis, and...

• Replies: 2
• Views: 3,088
09-18-2009, 09:44 AM
29. How do I do this calculation

Hi all, I am a mature student and just dont get how to do what most around me take as simple calculations This is from a coefficients table where...

• Replies: 1
• Views: 2,453
09-20-2009, 09:14 PM
30. Classification Rate of Multivariate Logistic Regression

Hello, I'm running a binary (2 groups), multivariate (multiple predictors) logistic regression analysis, and would like to test the classification...

• Replies: 1
• Views: 5,085
09-29-2009, 03:01 PM
31. what is: correlation? regression? confidence?

I need to learn statistics for a project I'm working on. I am totally lost and am spending more time than I thought I would on trying to understand...

• Replies: 1
• Views: 4,797
10-09-2009, 03:40 AM
32. Linear regression analysis - Urgent assistance required

Hi I am trying to examine the relation between ad. liking and attitude towards the brand. My hypothesis H1: "Commercials that are liked will...

• Replies: 6
• Views: 4,894
10-11-2009, 04:10 AM
33. 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: 3,550
10-13-2009, 08:26 AM
34. 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: 1,611
10-15-2009, 03:51 PM
35. scale issues

Please look at the following descriptive labels for a scale of importance. Extremely critical (7) Highly important (6) Very Important (5) ...

• Replies: 4
• Views: 2,644
10-19-2009, 08:11 AM
36. Logistic regression null values

I think I know the answer, but just confirming. I'm doing a multiple logistic regression with 15 predictor variables. Must ALL values of the...

• Replies: 0
• Views: 3,901
10-21-2009, 05:30 PM
37. Standard Error of Coefficients in Multiple Regression

Hi, I have built a model in Excel to do Multiple Regression. I am able to correctly calculate the intercept and the regression coefficients but I...

• Replies: 1
• Views: 14,086
10-26-2009, 02:49 PM
38. ANCOVA controversy?

Hello all, I have a question regarding ANCOVA, which seems straightforward, however an answer has eluded me. The question is: Can a...

• Replies: 3
• Views: 12,127
11-03-2009, 08:30 PM
39. Multiple Regression Interaction

Figured it out, thanks!

• Replies: 0
• Views: 2,614
11-05-2009, 02:54 PM
40. using prediction results in a separate model

hello! I'm looking for some feedback on an idea, if you're interested. The issue at hand is how to deal with the variable "age" as a predictor of...

• Replies: 1
• Views: 2,245
11-07-2009, 05:48 PM
41. How many IVs can I use?

I am hoping to publish the results of this in a journal (not a statistics one, an experimental science one). I have a sample size of 71...

• Replies: 2
• Views: 3,022
11-11-2009, 04:08 PM
42. Problem interpreting Multiple Regression on Video Game Sales

Hi everyone, I am a new member, I am so glad to have found the forum. I'm tearing my hair out about this problem. These are my results: ...

• Replies: 3
• Views: 5,322
11-11-2009, 04:28 PM
43. Multiple Regression Help

Hi, I'm currently working on an assignment in which I have to run a multiple regression, however I am a little confused regarding the order of the...

• Replies: 1
• Views: 2,230
11-13-2009, 08:02 AM
44. have a .por file, no spss, need to run analysis by tomorrow

Hi all.. I thought I could open the .por file I have on my home computer but it turns out the version I have doesn't open a file like this with more...

• Replies: 0
• Views: 3,807
11-23-2009, 09:13 PM
45. Nonparametric multiple regression

I want to know how to conduct the nonparametric equivalent of a multiple regression? I have 3 variables that are correlated according to spearman's...

• Replies: 0
• Views: 3,217
11-27-2009, 06:26 PM
46. Hpw to Determine the Hypotheses for a T-test Study?

• Replies: 4
• Views: 4,578
11-29-2009, 12:04 AM
47. Multiple regression

I am a bit confused with multiple regression. I understand every predictor will lead to different Y values and will create different linear lines...

• Replies: 0
• Views: 2,103
11-30-2009, 05:44 AM
48. Linear Regression

Hi, I have a dataset which contains a long list of variables (categorical eg. gender, zipcode group etc and continuous eg. income, home value etc)...

• Replies: 0
• Views: 2,057
12-01-2009, 11:19 AM
49. very quick question about the 'intercept'

If I am asked to state the intercept which one do I quote? Estimate, Std error, t value or Pr(>|t|) ? (If it makes any difference I am doing a...

• Replies: 4
• Views: 3,811
12-03-2009, 04:47 PM
50. multivariate multiple regression

Hello all: I'm working on a multivariate multiple regression analysis in SAS. I have 3 response variables and 2 independent variables. When...

• Replies: 0
• Views: 4,495
12-03-2009, 06:58 PM
51. multiple regression and adjusted r-squ

Hi there, I just found this forum in a fit of frustration and angst... Anyway, I'm running a multiple linear regression in SAS for a final...

• Replies: 0
• Views: 2,508
12-05-2009, 01:31 PM
52. Chi square as sneak peek into logistic regression

Let's say I have these variables... Dependent var: cancelled_flag Independent vars: region, gender, etc My ultimate goal is to do a logistic...

• Replies: 1
• Views: 4,451
mud
12-05-2009, 08:23 PM
53. Teaching multivariate statistics: text & software recommendations

Hello all, I'll be leading an introductory seminar to multivariate statistics in the spring and was looking for recommendations for texts that...

• Replies: 3
• Views: 4,440
12-08-2009, 09:54 AM
54. confusion about Ho/Ha hypothesis for simple/multiple regression

The one thing I do not understand (and my book doesn't explain) is how do you determine if it's Ha > 0, Ha < 0 or Ha =/= 0? Anyone can shed some...

• Replies: 2
• Views: 9,386
12-08-2009, 08:14 PM
55. Standard error of multiple regression coefficients

I was revising my undergraduate courses of Statistics which I took before 20 years. I was exercising how to construct ANOVA table for a regression...

• Replies: 14
• Views: 34,457
12-11-2009, 07:49 PM

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