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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....

    Started by scienceskillz‎, 06-17-2011 12:44 PM
    • Replies: 2
    • Views: 7,290
    06-20-2011, 08:37 PM Go to last post
  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...

    Started by FishMan‎, 06-19-2011 11:02 PM
    • Replies: 2
    • Views: 2,822
    06-20-2011, 08:11 PM Go to last post
  3. Chi square and Wald chi square

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

    Started by najmehjami‎, 06-20-2011 10:49 AM
    • Replies: 2
    • Views: 20,794
    06-20-2011, 01:26 PM Go to last post
  4. Multiple regression with non-normal distribution?

    I have some data that I would like to analyse by using multiple regression, as I am interested in the predictive ability of a model (variables...

    Started by judith_sw‎, 06-18-2011 04:58 PM
    • Replies: 7
    • Views: 25,033
    06-19-2011, 04:00 AM Go to last post
  5. 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...

    Started by Kara‎, 06-18-2011 05:21 AM
    • Replies: 2
    • Views: 4,125
    06-19-2011, 01:42 AM Go to last post
  6. How good is this regression?

    Hi everyone, new here. I am doing some research concerning 'transportation of college students'. I regressed data of student satisfaction as a...

    Started by graphicsgriffin‎, 06-05-2011 04:49 AM
    • Replies: 14
    • Views: 6,805
    06-18-2011, 05:10 PM Go to last post
  7. Cross validation bandwith selection

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

    Started by Torch‎, 06-18-2011 03:46 AM
    • Replies: 1
    • Views: 3,710
    06-18-2011, 09:52 AM Go to last post
  8. 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...

    Started by yoz2k3‎, 06-16-2011 05:04 AM
    • Replies: 1
    • Views: 5,411
    06-17-2011, 08:09 PM Go to last post
  9. 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...

    Started by bryangoodrich‎, 06-17-2011 12:07 AM
    • Replies: 8
    • Views: 8,923
    06-17-2011, 05:10 PM Go to last post
  10. Z-test in NB regression model

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

    Started by najmehjami‎, 06-12-2011 04:55 PM
    • Replies: 4
    • Views: 3,452
    06-15-2011, 10:54 AM Go to last post
  11. 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...

    Started by c2q‎, 06-12-2011 02:57 PM
    • Replies: 5
    • Views: 2,578
    06-15-2011, 08:06 AM Go to last post
  12. 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...

    Started by NN_STAT‎, 06-15-2011 02:31 AM
    • Replies: 0
    • Views: 1,505
    06-15-2011, 02:31 AM Go to last post
  13. 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...

    Started by l3a9k‎, 06-09-2011 08:35 AM
    • Replies: 7
    • Views: 3,494
    06-14-2011, 07:54 AM Go to last post
  14. 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...

    Started by conni‎, 06-14-2011 05:17 AM
    • Replies: 0
    • Views: 3,139
    06-14-2011, 05:17 AM Go to last post
  15. 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...

    Started by dce219‎, 06-11-2011 10:05 AM
    • Replies: 2
    • Views: 7,209
    06-13-2011, 08:47 PM Go to last post
  16. Comparing regression models with different predictor variables

    Hi I have done a multiple linear regression analysis on some measured acoustical parameters and have come up with tree equations that I wish to...

    Started by thelukewarm‎, 06-12-2011 04:42 AM
    • Replies: 1
    • Views: 2,584
    06-13-2011, 04:25 AM Go to last post
  17. 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...

    Started by NN_STAT‎, 06-13-2011 03:29 AM
    • Replies: 0
    • Views: 1,467
    06-13-2011, 03:29 AM Go to last post
  18. 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...

    Started by aha123‎, 06-12-2011 08:42 PM
    • Replies: 1
    • Views: 2,562
    06-12-2011, 09:32 PM Go to last post
  19. 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...

    Started by noga‎, 06-12-2011 02:54 PM
    questionnaire, repeated measures
    • Replies: 0
    • Views: 1,640
    06-12-2011, 02:54 PM Go to last post
  20. Question 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}...

    Started by Sambit‎, 06-10-2011 08:45 AM
    • Replies: 8
    • Views: 2,614
    06-12-2011, 11:13 AM Go to last post
  21. 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...

    Started by nicole‎, 06-12-2011 05:00 AM
    • Replies: 0
    • Views: 1,852
    06-12-2011, 05:00 AM Go to last post
  22. Logstic Regression: What's this Graph Mean

    I'm learning logistic regression from reading and asking questions on my own. The following plot is from the predicted values of a logistic...

    Started by trinker‎, 06-10-2011 10:59 PM
    • Replies: 6
    • Views: 2,983
    06-11-2011, 09:01 AM Go to last post
  23. 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,...

    Started by DataMonkey‎, 06-07-2011 03:47 PM
    • Replies: 2
    • Views: 2,418
    06-11-2011, 05:26 AM Go to last post
  24. 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...

    Started by chaps‎, 05-25-2011 04:24 AM
    • Replies: 9
    • Views: 4,845
    06-11-2011, 12:54 AM Go to last post
  25. 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 +...

    Started by alain1985‎, 06-10-2011 11:12 AM
    • Replies: 0
    • Views: 1,579
    06-10-2011, 11:12 AM Go to last post
  26. 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...

    Started by atol‎, 06-10-2011 06:48 AM
    • Replies: 1
    • Views: 1,979
    06-10-2011, 10:56 AM Go to last post
  27. 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...

    Started by DeMouraBR‎, 06-02-2011 09:45 AM
    • Replies: 13
    • Views: 7,990
    06-09-2011, 10:25 AM Go to last post
  28. 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. ...

    Started by nofunsally‎, 06-06-2011 11:57 PM
    binomial, count data, poisson, regression
    • Replies: 2
    • Views: 4,107
    06-07-2011, 02:32 PM Go to last post
  29. Question I need assistance with the interpretation of the attached regression

    Questions: I am trying to regress for price. Bal Prin= the unpain principle balance on the note CLTV=combined loan to value (1st +2nd...

    Started by Robert Moreno‎, 06-06-2011 01:33 PM
    • Replies: 0
    • Views: 1,893
    06-06-2011, 01:33 PM Go to last post
  30. 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...

    Started by lovejonesuk‎, 06-05-2011 03:34 PM
    • Replies: 1
    • Views: 4,336
    06-05-2011, 04:37 PM Go to last post
  31. 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...

    Started by PsychResearcherRASIS‎, 02-07-2011 11:09 AM
    • Replies: 8
    • Views: 8,791
    06-05-2011, 03:51 PM Go to last post
  32. Which regression to choose ?

    Hello, I need some help fitting a linear regression model. I have one dependent variable, and 2 IV's. I need to find the best model, which is, a...

    Started by Yankel‎, 06-04-2011 01:55 AM
    • Replies: 11
    • Views: 4,850
    06-05-2011, 01:24 PM Go to last post
  33. 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...

    Started by wab‎, 06-05-2011 06:49 AM
    regression, time
    • Replies: 0
    • Views: 1,713
    06-05-2011, 06:49 AM Go to last post
  34. 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...

    Started by leylay‎, 06-03-2011 01:19 PM
    path coefficients, pathway model, sem, structural equation model
    • Replies: 2
    • Views: 2,196
    06-04-2011, 11:48 PM Go to last post
  35. 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...

    Started by Drareg‎, 06-04-2011 05:33 AM
    • Replies: 0
    • Views: 2,537
    06-04-2011, 05:33 AM Go to last post
  36. 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...

    Started by Pachy‎, 06-03-2011 08:05 PM
    • Replies: 1
    • Views: 4,296
    06-03-2011, 09:07 PM Go to last post
  37. How do i disprove a trend?

    Hi there, I have collected some data (points) over the last twenty years of 50,000+ people who have broken their hips. Their ages (mean and SDs)...

    Started by bonedoctor‎, 05-31-2011 06:35 PM
    • Replies: 6
    • Views: 2,856
    06-03-2011, 11:40 AM Go to last post
  38. 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...

    Started by Aquabug222‎, 06-01-2011 01:29 PM
    • Replies: 0
    • Views: 1,533
    06-01-2011, 01:29 PM Go to last post
  39. 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 ...

    Started by kaboom786‎, 06-01-2011 01:24 PM
    • Replies: 0
    • Views: 2,283
    06-01-2011, 01:24 PM Go to last post
  40. 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...

    Started by NN_STAT‎, 05-29-2011 01:17 PM
    • Replies: 6
    • Views: 2,451
    05-31-2011, 03:13 AM Go to last post
  41. 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...

    Started by slee‎, 05-29-2011 10:31 AM
    • Replies: 2
    • Views: 2,392
    05-30-2011, 12:05 PM Go to last post
  42. 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...

    Started by Ageo7836‎, 05-26-2011 08:39 PM
    • Replies: 1
    • Views: 3,379
    05-29-2011, 07:01 PM Go to last post
  43. Lightbulb 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...

    Started by 5forwards‎, 05-29-2011 08:57 AM
    • Replies: 0
    • Views: 2,587
    05-29-2011, 08:57 AM Go to last post
  44. crazy b and exp(b) in logistic

    Hi I'm running an interaction in logistic regression and when I do so my b and exp(b) for one of my main effect variables gets crazy. I know that...

    Started by dce219‎, 05-27-2011 11:40 AM
    • Replies: 4
    • Views: 2,680
    05-27-2011, 01:20 PM Go to last post
  45. Question 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 ...

    Started by walol‎, 05-27-2011 06:59 AM
    • Replies: 1
    • Views: 5,948
    05-27-2011, 12:34 PM Go to last post
  46. Post 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...

    Started by Economists‎, 05-25-2011 07:52 AM
    • Replies: 1
    • Views: 2,136
    05-25-2011, 12:09 PM Go to last post
  47. 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...

    Started by PhDOH!‎, 03-27-2011 12:11 PM
    • Replies: 2
    • Views: 7,132
    05-25-2011, 12:36 AM Go to last post
  48. 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...

    Started by dou‎, 05-23-2011 04:26 AM
    • Replies: 2
    • Views: 3,876
    05-25-2011, 12:20 AM Go to last post
  49. 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...

    Started by Ollie123‎, 05-24-2011 10:13 PM
    • Replies: 0
    • Views: 2,466
    05-24-2011, 10:13 PM Go to last post
  50. 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...

    Started by do999‎, 05-24-2011 11:26 AM
    • Replies: 2
    • Views: 3,676
    05-24-2011, 12:33 PM Go to last post
  51. 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...

    Started by txc876‎, 05-22-2011 10:22 AM
    • Replies: 2
    • Views: 1,737
    05-23-2011, 07:02 AM Go to last post
  52. 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...

    Started by dou‎, 05-23-2011 04:21 AM
    • Replies: 3
    • Views: 3,007
    05-23-2011, 05:20 AM Go to last post
  53. 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...

    Started by dou‎, 05-22-2011 10:23 AM
    • Replies: 3
    • Views: 2,964
    05-23-2011, 04:49 AM Go to last post
  54. 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...

    Started by Ageo7836‎, 05-20-2011 11:31 PM
    • Replies: 1
    • Views: 3,602
    05-21-2011, 06:47 AM Go to last post
  55. 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...

    Started by pgseye‎, 05-20-2011 02:44 PM
    • Replies: 4
    • Views: 2,930
    05-21-2011, 02:07 AM Go to last post
  56. Help with choosing a model and identifying problems

    Hello, I have a complicated problem, I actually didn't start working on the data yet, still in the phase of planning. I need some help in getting...

    Started by NN_STAT‎, 05-12-2011 01:57 AM
    • Replies: 5
    • Views: 2,301
    05-20-2011, 09:52 AM Go to last post
  57. 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...

    Started by PeterU‎, 05-20-2011 04:17 AM
    • Replies: 0
    • Views: 1,968
    05-20-2011, 04:17 AM Go to last post
  58. Question Straightforward question about how to select Generalized Linear Model

    Hi! I have what I think is quite a straightforward problem for those in the know. I have a dependent variable measured in different subjects....

    Started by amorphia78‎, 05-18-2011 03:12 PM
    • Replies: 7
    • Views: 3,026
    05-19-2011, 02:54 PM Go to last post
  59. 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...

    Started by Outlier‎, 05-18-2011 06:24 PM
    • Replies: 4
    • Views: 2,437
    05-19-2011, 01:00 PM Go to last post
  60. 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...

    Started by will22‎, 05-17-2011 04:35 AM
    • Replies: 3
    • Views: 2,969
    05-18-2011, 09:18 PM Go to last post

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