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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### OLS + Serial Correlation + Cochrane-Orcutt Procedure

Hi Forum Experts, I am working through a OLS regression analysis where there is positive serial correlation in the independent variable over time....

• Replies: 2
• Views: 7,290
06-20-2011, 08:37 PM
2. ### Help with Normalizing data

This is my first time posting to this forum, and Im hoping to get some help. I am an engineer, and I have been assigned a project where I need to...

• Replies: 2
• Views: 2,822
06-20-2011, 08:11 PM
3. ### Chi square and Wald chi square

What is the difference between wald chi square test and chi square test in regression analysis?

• Replies: 2
• Views: 20,794
06-20-2011, 01:26 PM
4. ### Logistic regression - help needed

Hi, I want to predict a dependent variable from a set of (3) factor scores, as independent variables. The problem is that one of those scores...

• Replies: 2
• Views: 4,125
06-19-2011, 01:42 AM
5. ### Cross validation bandwith selection

Hi, is there a package in R for cross-validation optimal bandwith selection for nonaparemtric regression/autoregression functions estimation? (for...

• Replies: 1
• Views: 3,710
06-18-2011, 09:52 AM
6. ### Expectation/ Variance/ ACF and PACF in ARMA(2,1)

Hello guys, I hope I'm not posting in the wrong subforum. I am looking for a solution to calculate E, Var, and ACF and PACF coefficents in an...

• Replies: 1
• Views: 5,411
06-17-2011, 08:09 PM
7. ### Interaction Term in Logistic Regression

I'm reading Kutner, et al., Applied Linear Statistical Models (5th), and came across something I don't recall the authors explaining. I vaguely...

• Replies: 8
• Views: 8,923
06-17-2011, 05:10 PM
8. ### Z-test in NB regression model

what is the null hypothesis of z-test in negative binomial regression?

• Replies: 4
• Views: 3,452
06-15-2011, 10:54 AM
9. ### Simple regression question

Hi. I know most of my basic regression stuff but I forgot one thing. I conducted a regression with 4 independent variables and from my regression...

• Replies: 5
• Views: 2,578
06-15-2011, 08:06 AM
10. ### Weird results

Hello, I ran a regression analysis, with 2 IV's. One is highly significant, and explain about 93% of the variance. The second is significant, but...

• Replies: 0
• Views: 1,505
06-15-2011, 02:31 AM
11. ### In stepwise regression, can the number of predictors be >n?

Hi, I'm getting an error when I try to run a stepwise regression with backward elimination - it says there is not enough data in the columns. I...

• Replies: 7
• Views: 3,494
06-14-2011, 07:54 AM
12. ### standardized parameters

Hello, can anyone help me with a brief explanation? Usually I use the "stb" model option while running the proc logistic in sas to calculate the...

• Replies: 0
• Views: 3,139
06-14-2011, 05:17 AM
13. ### coefficient changes direction with interaction term entered

Hi I'm running a logistic regression and my first model tests the direct effects of a variable (X) which is initially negative. In the second model...

• Replies: 2
• Views: 7,209
06-13-2011, 08:47 PM
14. ### Looking for Statistical explanation

Hello, I deal now with multivariate regression, I have 2 IV's, called X1 and X2, and I have several Y's (DV's), and I try to fit a model to each...

• Replies: 0
• Views: 1,467
06-13-2011, 03:29 AM
15. ### what method to use for modeling flue motality rate

Here is the flu mortality graph from CDC. http://www.cdc.gov/flu/weekly/weeklyarchives2010-2011/images/picurve22.gif Mortality rate(red line) is...

• Replies: 1
• Views: 2,562
06-12-2011, 09:32 PM
16. ### regression in repeated-measures design with questionnaires as predictors

Hi everyone, I have 2X2 repeated measures design (congruent/incongruent and negative/neutral). I want to predict the main effects and the...

• Replies: 0
• Views: 1,640
06-12-2011, 02:54 PM
17. ### covariance and variance of BLUE

Consider an RBD with 5 replications and 4 treatments t_1,t_2,t_3,t_4. We are given the following three treatment-contrasts: \frac{t_1-t_2}{2}...

• Replies: 8
• Views: 2,614
06-12-2011, 11:13 AM
18. ### beta value- standardised regression coefficient

Hi I was wondering if the t-test in a regression output can be used to state the significance of the Beta value and not just the unstandardised...

• Replies: 0
• Views: 1,852
06-12-2011, 05:00 AM
19. ### SEM logic: beginner question

Hello everybody, I have a question with regard to the basic logic of SEM: How is it plausible to expect that, for example, four indicators (a1,...

• Replies: 2
• Views: 2,418
06-11-2011, 05:26 AM
20. ### Prediction Region/Set from Multiple Logistic Regression

Hello all, I'm not sure how easy or difficult the following question actually is but for all my efforts I haven't been able to find the answer, if...

• Replies: 9
• Views: 4,845
06-11-2011, 12:54 AM
21. ### Comparing coefficients with different input dependent variables, but the same model.

I have the following problem. I have the following model I use per sector (for example: Industrial, telecom, tech etc.): cccountry = a +...

• Replies: 0
• Views: 1,579
06-10-2011, 11:12 AM
22. ### Interdependence problem in time-series regression

Hello I have a sample of 26 firms. I have computed transparency scores for these firms’ annual financial reports. The goal is to determine if...

• Replies: 1
• Views: 1,979
06-10-2011, 10:56 AM
23. ### Gauss Elimination

Hi guys. Im being asked to program Gauss Elimination in R .Im new using this kind of program. It's simple but i don't know how to start. can someone...

• Replies: 13
• Views: 7,990
06-09-2011, 10:25 AM
24. ### Appropriate regression for dependent count data and independent "not count data"

Hello, My independent data are continuous variables. My dependent variable is count data. I want to use regression to look for a relationship. ...

• Replies: 2
• Views: 4,107
06-07-2011, 02:32 PM
25. ### Use of p-values for Cox proportional hazards model.

I'm just reading what looks like quite a robust cohort study looking at patient survival after taking beta-blockers (a heart drug). The authors...

• Replies: 1
• Views: 4,336
BGM
06-05-2011, 04:37 PM
26. ### Confidence Intervals for Estimates in Multinomial Logistic Regression

Hello all, Is there a way to calculate a confidence interval for the estimates occurances of a dependent variable when using multinomial logistic...

• Replies: 8
• Views: 8,791
06-05-2011, 03:51 PM
27. ### Comparing time-based regressions

Hello! I have a ton of temperature data over time for 38 different subjects (over 100,000 lines of data) that I ran regressions on for each...

• Replies: 0
• Views: 1,713
wab
06-05-2011, 06:49 AM
28. ### Applying SEM model to mutually exclusive smaller datasets

Hello, I have an SEM model I am happy with and I am examining the standardized path coefficients. Then when I split the original data set into...

• Replies: 2
• Views: 2,196
06-04-2011, 11:48 PM
29. ### I(1)?deterministic trend? you could probably answer this!

Hey all I am using the Augmented Dickey-Fuller test on EViews7 to test for stationarity in two series; ln(employment) and the ln(wage rate). Both...

• Replies: 0
• Views: 2,537
06-04-2011, 05:33 AM
30. ### Data Transformations in Multiple Regression

I have a non-normal distribution for the residuals I'm testing for a multiple regression--what's the best course of action to take? If I transform...

• Replies: 1
• Views: 4,296
06-03-2011, 09:07 PM
31. ### Weather Prediction

I am looking at past temperature, solar angle, and wind vectors to develop a prediction of the temperature in the next hour. What would be the...

• Replies: 0
• Views: 1,533
06-01-2011, 01:29 PM
32. ### Multiple regression model validity question

Regression Analysis: Return versus S, M, A, T The regression equation is Return = - 1.15 + 0.00507 S + 0.674 M - 0.141 A + 0.082 T ...

• Replies: 0
• Views: 2,283
06-01-2011, 01:24 PM
33. ### Many DV's

Hello, I need help, maybe someone can assist. My data consist signal that comes from a machine (a sensor of a machine). The engineers that...

• Replies: 6
• Views: 2,451
05-31-2011, 03:13 AM
34. ### Regression Questions

I am investigating the effect of cruise ship size on cruise ship occupancy rates. In addition, I am investigating the effect of cruise itinerary...

• Replies: 2
• Views: 2,392
05-30-2011, 12:05 PM
35. ### Rescaling Variables

hi guys, I'm trying to rescale variables so that I don't get such small coefficients. How should I go about this? Multiply independent by a...

• Replies: 1
• Views: 3,379
05-29-2011, 07:01 PM
36. ### Exclude Interaction Term and Include Fixed Effects instead

Hey everybody. I know I shouldn't exclude the terms of an interaction variable in my regression; however, If I include both terms I have the...

• Replies: 0
• Views: 2,587
05-29-2011, 08:57 AM
37. ### What does the correlation matrix for a multiple regression analysis contain?

hi :wave: how do u doing? I have this quiz tomorrow and I need answer for one quistion If any one of u guys knew the answer u just type it ...

• Replies: 1
• Views: 5,948
05-27-2011, 12:34 PM
38. ### Multiple Linear Regression With Dummy

Hi Friends, i m writing my M.Sc Thesis. During regression i got some problem, my problem is in dummy variable, some variables are in...

• Replies: 1
• Views: 2,136
05-25-2011, 12:09 PM
39. ### Comparing regression models for transformed and untransformed data

I feel like I saw an answer to my question on here in the past, so I apologize if this is a repeat, but I have been unable to find the answer today...

• Replies: 2
• Views: 7,132
05-25-2011, 12:36 AM
40. ### Is it normal to have negative constants?

I was wondering whether we must include an intercept term in our equation? Also I have negative (some) significant constants. I know it means that...

• Replies: 2
• Views: 3,876
05-25-2011, 12:20 AM
41. ### Regression with incomplete data

I have a potentially foolish question I'm hoping someone here can answer. I'm running a laboratory-based study and the primary analyses will be...

• Replies: 0
• Views: 2,466
05-24-2011, 10:13 PM
42. ### Regression on a non-normal dependant variable

Hi there, This situation is new to me: I have non-normal DV, for which no proper non-linear transformation (that I know of) exists. It is a score...

• Replies: 2
• Views: 3,676
05-24-2011, 12:33 PM
43. ### Desperate to get a handle on regression

I'm looking at predictors of helmet use amongst skiers. (200 subjects sent a questionnaire.) I have 5 or 6 categorical data columns such as...

• Replies: 2
• Views: 1,737
05-23-2011, 07:02 AM
44. ### Large coefficient problem

Hello, i'm running linear regressions for a large cross country panel data: the simplified term is similar to y = a + b + axb. When I run...

• Replies: 3
• Views: 3,007
05-23-2011, 05:20 AM
45. ### Interaction term

Hi, I'm running linear regressions (1) Y = a + b and (2) Y = a + b + axb The coefficients for a and b in (1) have positive signs which are...

• Replies: 3
• Views: 2,964
dou
05-23-2011, 04:49 AM
46. ### Standard errors in IV and 2SLS

Hi guys, I'm running an instrumental variable regression and the same two stage least squares regression in R. I get the same coefficient...

• Replies: 1
• Views: 3,602
05-21-2011, 06:47 AM
47. ### How to approach model selection

Hi, This is my first formal attempt at a regression analysis that we hope to write up and submit. Basically we're wanting to investigate the effect...

• Replies: 4
• Views: 2,930
05-21-2011, 02:07 AM
48. ### Precautions when using multiply imputed data in pooled OLS regression

Dear all I am doing a straightforward pooled linear regression on a panel dataset (45 countries, 20 years) using OLS and relevant time dummies and...

• Replies: 0
• Views: 1,968
05-20-2011, 04:17 AM
49. ### Ratings of spotlights

I'd like to maximize my candlepower per dollar for spotlights. The packaging may list one or two parameters of watts, lumens or candlepower and I'd...

• Replies: 4
• Views: 2,437
05-19-2011, 01:00 PM
50. ### Generalised Least Squares VS Multilevel Modeling...

hello guys! i've been trying to wrap my head around this question for a while... if i understand things correctly, generalised least squares (GLS) is...

• Replies: 3
• Views: 2,969
05-18-2011, 09:18 PM

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