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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Problems with adjustment in mediation model

I am using Baron & Kenny's procedure to test a mediation hypothesis. I realize that the field has evolved a little and others, such as Preacher &...

• Replies: 0
• Views: 2,418
03-05-2011, 06:48 PM
2. ### Linear regression on ranked data

The dependent variable consists of a set of ranks for two types of project: Logistics and Engineering, to which I've applied a normal transformation....

• Replies: 0
• Views: 4,908
03-08-2011, 03:37 PM
3. ### Combining Model Scores

Question for the regression modeling experts: I am looking for an efficient and correct way to combine model scores taking into account...

• Replies: 0
• Views: 4,576
03-09-2011, 04:40 PM
4. ### Std Error of nonlinear regression coefficients

Hi There, I have a commercial NET dll computing nonlinear regression coefficients and their sigma values. However, I would like to compute the...

• Replies: 0
• Views: 3,638
03-10-2011, 08:11 PM
5. ### I need to solve this proplem

I have to solve this proplem supposeY1,Y2 are random variables with normaly joint distribution Y1~N(u1,segma1^2) Y2~N(u2,segma2^2) prove that...

• Replies: 1
• Views: 2,073
03-10-2011, 10:15 PM
6. ### Proc model

I am now learning sas from the scratch. well, with Proc model procedure I want to get residuals, predicted values and possibly studentized...

• Replies: 0
• Views: 3,815
03-11-2011, 12:09 PM
7. ### Solve for the following values

I need to solve for a,b,c,d by hand showing calculations but I can't seem to find any equations that will help me here. We haven't been given any...

• Replies: 4
• Views: 2,596
03-11-2011, 01:50 PM
8. ### Exponential Trendline and Equations dont match...

Hi there I have a graph of output values that I have to plot linear and exponential trendlines on and then show the equations and calculate for...

• Replies: 1
• Views: 2,860
BGM
03-11-2011, 04:02 PM
9. ### I need help

I need help I have this homework that I cant solve it Show that s^2=(1|n-2)∑(y-y^) is unbiased estimator for sigma^2 in linear regression model...

• Replies: 5
• Views: 2,220
03-12-2011, 12:13 PM
10. ### Post Hoc or Contrasts ?

Hi Guys, I have a theoretical question... Someone asked me today what's better to perform while using Analysis of variance: a prior analysis...

• Replies: 1
• Views: 3,359
03-13-2011, 03:59 AM
11. ### regression + ANOVA, is it ok?

Say I'm measuring subjects' performance over some training time. And I have several factors which I thought may affect learning, such as reward. So...

• Replies: 1
• Views: 2,655
03-14-2011, 11:40 PM
12. ### Multi-Level Models with perfectly correlated outcomes

Hello, I am trying to utilize multilevel regression analysis in SPSS (mixed models) to predict outcomes in negotiations between two individuals....

• Replies: 3
• Views: 2,872
03-15-2011, 05:39 AM
13. ### Linear Regression - Theory

Hi Guys, I have some theoretical questions about regression models, I need an answer or true or false for the next few phrases.... 1. Leverage...

• Replies: 3
• Views: 3,393
03-16-2011, 03:16 AM
14. ### regression analysis with an infinite number of predictors....

so i was reading this article and kinda got me wondering... for standard, OLS multiple regression... can we have an infinite number of...

• Replies: 2
• Views: 3,465
03-16-2011, 03:30 PM
15. ### Logistic regression - help please!

Hello, I was wondering if there are any kind souls out there who might be able to help me with a problem I am having with logistic...

• Replies: 2
• Views: 2,621
03-16-2011, 09:38 PM
16. ### Linear regression, nonlinear regression or something else?

Hi! I do apologies in advance for any misuse of terms or the lack of understanding in statistics - as I've only realised, after Googling for hours,...

• Replies: 0
• Views: 3,628
03-16-2011, 10:56 PM
17. ### logistic regression results

dear all, I've been using the logistic regression for my data. Let's just say I'm predicting the possibility of A or B. I use four predictors, one...

• Replies: 0
• Views: 1,957
03-17-2011, 06:38 AM
18. ### coding for dummy variable

Hello all, I am wondering why dummy variables should always be coded either 0 or 1. For example, does it make any mathematical difference in...

• Replies: 2
• Views: 5,713
03-17-2011, 07:26 AM
19. ### Need help on regression

I am doing a regression analysis. One one side, independent, I have treatment days/fractions and on other side, dependent, i have a measure of...

• Replies: 4
• Views: 2,897
03-18-2011, 10:36 AM
20. ### Regression results

Hello! I need help with the results of regression analysis. I have significant percentage of variance explained (not big, only 5%), but none of...

• Replies: 3
• Views: 2,904
03-20-2011, 04:43 PM
21. ### Nonlinear Regression for the P/PE of the S&P 500??

Hello All, I’m hoping that someone can help me figure out what regression model I should be using. I don’t think that a linear regression model...

• Replies: 1
• Views: 3,787
03-20-2011, 04:54 PM
22. ### Removing insignificant variables

Say I'm plotting a multivariate regression with five variables, and three of them come up statistically insignificant. Why is it important to try...

• Replies: 2
• Views: 7,538
03-21-2011, 01:49 AM
23. ### Spanning test with short sales constraints - how does it works?

Dear all, I need to perform a spanning test with short sales constraint to assess the diversification potential of microfinancial assets. I red...

• Replies: 0
• Views: 2,959
03-21-2011, 01:55 PM
24. ### Regression in First and Second Differences

I am running a regression in STATA to determine if temperature effects natural gas production in Russia and I am including the following variables...

• Replies: 3
• Views: 17,084
03-22-2011, 05:45 PM
25. ### Need Help Choosing a Textbook

Hi, I'm looking for a textbook/book to let me self-study regression analysis. Some background: I have a research psych background...

• Replies: 0
• Views: 1,842
03-23-2011, 10:13 AM
26. ### Regression analysis for a cross sectional study

Good morning all. I am supposed to perform a regression analysis for a crossectional survey, using STATA. The thing is i dont know where to...

• Replies: 0
• Views: 5,644
03-24-2011, 12:14 AM
27. ### Same point of a graph? Novice needs guidance!

Dear All, I'm a BSc student currently involved in materials testing. In several of my tests I am getting a graph plotting extension(mm) vs....

• Replies: 1
• Views: 2,392
03-24-2011, 05:15 PM
28. ### Logistic regression question

Hi everyone, I have a question regarding an exercise on Gujarati's "Basic Econometrics" (exercise 15.2 p.625 4th edition). In this exercise we are...

• Replies: 0
• Views: 2,129
03-25-2011, 05:47 AM
29. ### Regression using Panel Data. Did I do it right?

Sorry I did it wrong!

• Replies: 2
• Views: 4,370
03-25-2011, 07:20 AM

Hello, I'm not sure which model to use, I'm guessing it is some type of regression. If you could help, I'd greatly appreciate it! The problem...

• Replies: 2
• Views: 2,449
03-25-2011, 11:07 AM
31. ### is this model misspecified

i'm doing a regression on size of company (x) to explain revenue multiple (y). i'm using the companies' revenues and divide them into 5 groups...

• Replies: 3
• Views: 2,758
03-25-2011, 11:12 PM
32. ### Regression Variable (Only Applicable to Certain Cases)

Hi, I'm doing a multiple linear regression. One of the variables I am using is a continuous numerical variable, however, it only applies to about...

• Replies: 1
• Views: 3,021
03-27-2011, 08:47 PM

okay the regression formula that i have worked out is y=12559.7477 + 4265.7566X i have to discuss the size, sign, significance and meaning of this. I...

• Replies: 1
• Views: 6,150
03-27-2011, 08:49 PM
34. ### Model specification for Pooled Panel Regression

I am doing a research on the diversification potential of microfinancial assets. The methodology I use is a mean variance spanning test. I have to...

• Replies: 1
• Views: 6,900
03-27-2011, 09:06 PM
35. ### Does the intercept p value matter?

Hi, I have outputs of a simple linear model as follows: y = 0.0339 + 0.27918X The p value of the intercept is 0.206 and of the slope is...

• Replies: 4
• Views: 50,945
03-28-2011, 08:14 PM
36. ### Robust regression

Hi, I am trying to use robust regression instead of ordinary least squares since my data set has a lot of outliers but I don't know if I have...

• Replies: 0
• Views: 4,180
03-28-2011, 09:18 PM
37. ### Ordinal regression vs Linear regression

Here's the situation: I have a categorical dependent variable (3 categories), and 3 continuous explanatory variables. Say I perform an ordinal...

• Replies: 0
• Views: 4,277
03-29-2011, 02:02 AM
38. ### what does the parameter a and b mean?

I have worked out the regression equation Y= 12559.7477 + 4265.7566X What does 12559.7477 and 4265.7566X mean? Is 12559.7477 the y-intercept...

• Replies: 0
• Views: 2,347
03-29-2011, 04:54 AM

Hi there, I believe I have a trivial question. I am studying logistic regression and trying to understand how the values are transformed - e.g ...

• Replies: 4
• Views: 3,944
03-29-2011, 05:34 PM

I am a master's student in Environmental Management and have conducted a stated preference experiment in which I presented respondents with two...

• Replies: 0
• Views: 2,647
03-30-2011, 10:36 AM
41. ### non-nested models in multilevel analysis

Hi, I have a question on multilevel analysis. I'm reading a book by Kreft & de Leeuw (Introducing Multilevel Analysis). They give an example for a...

• Replies: 1
• Views: 3,781
03-31-2011, 10:37 AM
42. ### Logistic Regression with too many IV

Hi Guys, What would you do, if you had to build a logistic regression model, where you have 500 (!!) independent variables... ? Any manual best...

• Replies: 11
• Views: 6,866
04-01-2011, 12:45 PM

Hey everyone, Does anyone know the steps that minitab or any other stats software does to eliminate variables when doing forward selection,...

• Replies: 0
• Views: 3,325
04-01-2011, 05:37 PM
44. ### Help with repeated measures analyses

Hi everyone It is my first posting in this forum so hope I am not asking something that has been answered lots. I am trying to analyses a...

• Replies: 0
• Views: 2,175
04-03-2011, 03:08 AM
45. ### Logistic Regression - Residual Deviance > Residual Df

Hi There I'm doing a logistic regression on a set of data with 753 groups of observations (although some groups just have one observation). In...

• Replies: 3
• Views: 9,182
04-03-2011, 08:08 AM
46. ### Hosmer-Lemeshow

Hi! How do you discussion the vaule for the Hosmer-Lemeshow goodness of fitt in a logistic regression? I tha value 0,290 bad? Regards!

• Replies: 7
• Views: 9,339
04-04-2011, 07:24 AM
47. ### Generalized Cross Validation

Hello Guys, I'm runing MATLAB code on SVD with roughness penalties. When I use GCV to choose the parameter, I have a question regarding the...

• Replies: 0
• Views: 3,313
04-05-2011, 08:04 AM
48. ### Testing interaction effects

I had a few question regarding the testing of interactions. First, should I be centering my variables using the mean and/or standardizing my...

• Replies: 2
• Views: 4,024
04-05-2011, 03:15 PM
49. ### Repeat sales regression help

Hello everyone, I am in need of any help or guidance working on a repeat sales regression using spss. I am doing a repeat sales index on housing...

• Replies: 0
• Views: 4,879
04-05-2011, 04:36 PM
50. ### what is cross section regression analysis?

Can someone help me by defining what is cross section regression analysis and the limits of this. :)

• Replies: 1
• Views: 22,092
04-06-2011, 12:40 PM
51. ### Transformation of Data - NO linearity!

PROBLEM >>>>>>>>> The savings rate (personal savings/disposible income) and per capita disposible income (DPI) are listed for the 50 countries...

• Replies: 2
• Views: 3,496
04-07-2011, 01:17 AM
52. ### Linear Regression Coefficient and Multiple Regression Coefficient

Hello Folks: When you use just 2 variables for regression and then when you use the same 2 variables plus an additional 2 other independent...

• Replies: 3
• Views: 8,463
04-07-2011, 08:48 PM
53. ### Help with Mutiple Regression Analysis

Hello, I am doing my dissertation on Racial differences in Stigma related attitudes towards mentall illness. I have 200 participants, 120 from...

• Replies: 4
• Views: 3,046
04-07-2011, 08:50 PM
54. ### R^2 vs AIC paradox?

Hi Everyone, I have the following situation which has me a bit puzzled. I've fitted two different linear models to a data set and would like to...

• Replies: 13
• Views: 16,227
04-07-2011, 11:10 PM
55. ### regression and correlation

Hello, correlation between two variables is positive (and significant) and then when I put it in regression analysis it becomes negative predictor...

• Replies: 1
• Views: 3,325
04-08-2011, 05:15 AM
56. ### help with Linear regression with nfl stats please

Hey guys, just wondering if I could get some help with the best way to use my data. After the challenge system was introduced into the nfl in 1999...

• Replies: 3
• Views: 4,320
04-09-2011, 01:19 AM
57. ### Interpretation of Loglinear model

Hi All, I am performing a regression analysis through a log linear model. But I am not able to effectively interpret the coefficient of the...

• Replies: 2
• Views: 15,683
04-10-2011, 01:17 AM
58. ### Variable selection for multiple regression analysis

Hi everybody there. I want to correlate 2 main variables (say "a" Dependant and "b" independent of course) BUT at the same time i want to add 5 other...

• Replies: 2
• Views: 3,965
04-11-2011, 06:08 PM

Hi all, I've never really understood the concept of "link functions". Is anyone able to point me in the right direction of something that could...

• Replies: 1
• Views: 3,012
04-12-2011, 05:51 AM

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