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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Unhappy Mean Squared Prediction Error?

    Hi, I am having trouble understanding how to use MSPE. Let's say I have 30 data points and then a sample of 4 of them is selected (the 'test...

    Started by TheFirstOrder‎, 04-12-2011 10:50 AM
    • Replies: 0
    • Views: 3,703
    04-12-2011, 10:50 AM Go to last post
  2. Discrete regression

    What is the/an appropriate regression technique to use where the dependent variables are discrete labels. For example, I have predicted survival...

    Started by marius1‎, 04-12-2011 11:59 AM
    • Replies: 0
    • Views: 2,403
    04-12-2011, 11:59 AM Go to last post
  3. Factor in binary logistic regression?

    Hi, I am currently performing a binary logistic regression, with a number of predictors. The aim is to measure the relationship between the...

    Started by blastStu‎, 04-10-2011 06:07 AM
    • Replies: 1
    • Views: 3,251
    04-13-2011, 02:47 AM Go to last post
  4. Johansen Cointegration test issue

    Hello, Let me describe the issue: I have a vector of four time series, each component of which is I(1). When I put the four series into a matrix...

    Started by LostInNY‎, 04-14-2011 05:00 PM
    cointegration, johansen
    • Replies: 0
    • Views: 2,262
    04-14-2011, 05:00 PM Go to last post
  5. Question Time series or just repeated measures?

    Hi All, I have data on 7 clusters (ie, sites). The date are monthly counts (there is no zero inflation in most of the outcomes of interest...most...

    Started by SabbyATL‎, 04-14-2011 09:14 PM
    clusters, count data, repeated measures, time series
    • Replies: 0
    • Views: 2,966
    04-14-2011, 09:14 PM Go to last post
  6. proof:variance

    Hi, I want to find the variance of coeffiicient b(beta) in a regression without constant term(no intercept).I am not ]with variance algebra. I...

    Started by economit‎, 04-15-2011 08:21 AM
    • Replies: 2
    • Views: 4,855
    04-15-2011, 09:27 AM Go to last post
  7. working correlation matrix to use in generalized estimating equations

    I have a design with a between-subject variable (emotion) and within-subject variable (task type), and response data were binary (answer to a task:...

    Started by Yue‎, 04-15-2011 02:41 PM
    • Replies: 0
    • Views: 3,623
    04-15-2011, 02:41 PM Go to last post
  8. Logit Equation - fitting the quadratic

    Hi, I posted a question in the main stats forum, but basically, I wondered if anyone knows the formula to fit the quadratic to the logit equation?...

    Started by Knockout‎, 04-16-2011 05:08 AM
    • Replies: 1
    • Views: 3,105
    04-16-2011, 11:48 PM Go to last post
  9. regression with categorical predictor

    Hi people, i have a problem which i could not solve myself, maybe somebody can help me. i have three groups (A/A, A/B and B/B) and a continuous...

    Started by muraveinik‎, 04-11-2011 01:14 PM
    • Replies: 1
    • Views: 3,269
    04-17-2011, 12:02 AM Go to last post
  10. Moderated Multiple Liner Regression

    Hey, I'm doing some research on the sensitivity of executive compensation (DP) to a set of economic determinants (IV). The main part of my...

    Started by Swede159‎, 04-08-2011 07:17 AM
    • Replies: 1
    • Views: 2,464
    04-17-2011, 12:20 AM Go to last post
  11. Regression with latent variable

    Hi, I'm doing some research for my dissertation and need to construct a latent variable that includes observations of various economic...

    Started by Swede159‎, 04-15-2011 11:01 AM
    latent variable
    • Replies: 3
    • Views: 6,980
    04-17-2011, 01:11 PM Go to last post
  12. Interaction Between Quadratic Variables in Logistic Regression

    Hi, I got some questions about assumption and interpretation of conditional logistic regression. It seems that two of my variables (let says N and...

    Started by STG‎, 04-18-2011 07:42 AM
    • Replies: 0
    • Views: 3,360
    04-18-2011, 07:42 AM Go to last post
  13. complex survey analysis and weight variables in proc surveylogistic

    I am analyzing the effect of Calcium on Obesity in adults based on the NHANES dataset. I have two questions. First, since I am combining two day...

    Started by sabina9‎, 04-18-2011 10:26 AM
    • Replies: 1
    • Views: 4,145
    04-18-2011, 11:05 AM Go to last post
  14. Weighted Least Squares & VIF - SPSS questions

    I was hoping someone could help me understand a problem I am having. I frequently use weighted least squares, however I do not estimate the weights...

    Started by AnalystNYC‎, 04-19-2011 10:17 AM
    • Replies: 0
    • Views: 4,136
    04-19-2011, 10:17 AM Go to last post
  15. Multiple regression test of significance using r squared

    I have a multiple regression with 5 independent variables, and obtained the r^2. Then I removed two IVs, and get the R^2 for the reduced model with...

    Started by mattc‎, 04-19-2011 01:47 PM
    • Replies: 4
    • Views: 9,737
    04-19-2011, 05:06 PM Go to last post
  16. Error Propagation in Multivariable Regression

    I've spent all day reading Matlab tutorials and can't seem to find anything about propagating error in regression analysis. I have a set of x and y...

    Started by lizakova‎, 04-20-2011 05:41 PM
    • Replies: 0
    • Views: 2,956
    04-20-2011, 05:41 PM Go to last post
  17. Easy Questions: Simple regression

    Hi, I have three questions for you on which I have issues: Should I use correlation test or simple regression: that "ratio data" is...

    Started by Robjam‎, 04-21-2011 07:55 AM
    • Replies: 3
    • Views: 2,806
    04-21-2011, 03:51 PM Go to last post
  18. Multiple Regression: Help to prove SD Beta 3 minus Beta 4

    Hi I've been having a lot of trouble with this problem. How do I show that; SD_Beta3 - Beta4 = √(Var(Beta_3)+Var(Beta_4)-2Cov(Beta_3, Beta_4))...

    Started by sykes87‎, 04-21-2011 12:06 PM
    variance for rv sum
    • Replies: 4
    • Views: 2,754
    04-21-2011, 05:57 PM Go to last post
  19. Linear mixed model without random or repeated effects? GLMZ?

    Hi, I'm working on a dissertation, of which many chapters have longitudinal data and I've been using linear mixed models to estimate growth. I...

    Started by jcs691‎, 04-21-2011 09:12 PM
    generalized linear model, growth model, lmm, mixed models, multilevel model
    • Replies: 1
    • Views: 3,082
    04-22-2011, 10:18 AM Go to last post
  20. Logistic Regression Probability

    Hi Guys, I'm working on a simple logistic regression problem. I'm wanting to find the exact value of x(independent variable) that gives a 0.5...

    Started by csb89‎, 04-19-2011 04:00 PM
    • Replies: 4
    • Views: 2,557
    04-22-2011, 02:47 PM Go to last post
  21. Choosing the Best Regression Model

    I have been asked to build a predictive model of a population based on cost. The sample size of the population is 30k for the current test (with data...

    Started by JAH‎, 04-22-2011 03:48 PM
    • Replies: 0
    • Views: 3,663
    04-22-2011, 03:48 PM Go to last post
  22. Correlation and Multiple Regression

    Can you please help me understand the following questions - 1. Looking at correlations and scatterplots how can we determine if multiple regression...

    Started by raamaak‎, 04-23-2011 03:32 AM
    • Replies: 0
    • Views: 1,704
    04-23-2011, 03:32 AM Go to last post
  23. Test Review HELP!!

    this is a example for my test review and i dont know how to do b,c,d,e parts of it can someone tell me how to do it/the answer so i can better...

    Started by patshea098‎, 04-23-2011 08:14 AM
    • Replies: 1
    • Views: 3,436
    04-23-2011, 11:18 AM Go to last post
  24. Estimated Variance of R squared

    I'm looking to compare two R squareds using a formula derived from a article called Correlation Redux by Olkin & Finn. This technique doesn't appear...

    Started by trinker‎, 04-21-2011 07:35 PM
    • Replies: 4
    • Views: 7,429
    04-23-2011, 11:50 AM Go to last post
  25. Phonetics: Interactions without one of the main effects

    I am using a logistic regression model with bias reduction in order to predict the contrast between /b/ and /p/ in Ojibwe based on acoustic...

    Started by Adam J.R. Tallman‎, 04-22-2011 09:11 PM
    aic discriminant, interaction effect
    • Replies: 5
    • Views: 3,627
    04-23-2011, 03:32 PM Go to last post
  26. Instrumental variables

    I am doing monte carlo simulations and comparing OLS with instrumental variables estimates, however while most of my betas seem consistent when IV is...

    Started by thedreamshaper‎, 04-24-2011 09:02 AM
    • Replies: 1
    • Views: 1,953
    04-24-2011, 10:54 AM Go to last post
  27. Thumbs up Dealing with missing data?!

    Hi guys, I was wondering if anyone can help me figure out what to do, I am pretty bad at statistics but needs must and all that! :p Basically...

    Started by Royalty‎, 04-23-2011 11:03 AM
    • Replies: 7
    • Views: 6,549
    04-24-2011, 12:51 PM Go to last post
  28. Partial regression plots in R

    Hey guys, I'm slowly converting myself from an SPSS user to an R user. I'm running a pretty basic multiple regression model and want to produce...

    Started by pinkfreud‎, 04-24-2011 11:15 AM
    multiple, partial, plots, regression
    • Replies: 1
    • Views: 23,691
    04-24-2011, 01:39 PM Go to last post
  29. Interpreting the coefficient in a NegBin regression

    Hi, I am doing a regression on immigration in Denmark. My dependent variable is a count variable with the number of immigrants between two regions...

    Started by Jeppe‎, 04-23-2011 04:20 PM
    • Replies: 1
    • Views: 12,504
    04-24-2011, 07:33 PM Go to last post
  30. Subadditivity?

    I am being asked whether certain interactions in a multiple logistic regression model with are subadditive or not. I was told to use a graph to...

    Started by Adam J.R. Tallman‎, 04-24-2011 10:23 PM
    • Replies: 1
    • Views: 1,819
    04-24-2011, 10:24 PM Go to last post
  31. testing regressions

    Hi, I have a very simple question: when I run a regression what are the things that I should test for to make sure that my regression is solid....

    Started by 12345678‎, 04-23-2011 11:38 AM
    • Replies: 1
    • Views: 2,228
    04-25-2011, 10:14 AM Go to last post
  32. collinearity - incorrect sign?

    I read from a book that the collinearity (or multicollinearity) could possibly lead the signs of the regression coefficients to being incorrect....

    Started by liamplayt‎, 04-25-2011 10:01 PM
    collinearity, regression
    • Replies: 4
    • Views: 3,210
    04-26-2011, 02:43 AM Go to last post
  33. Find expected value and variance of ARMA(1,1) model

    My apologies if this isn't the correct subforum to ask this question. Here's the model: y_{t}=50+ 0.8y_{t-1} + a_{t} - 0.2a_{t-1} How do I...

    Started by downthesun01‎, 04-25-2011 06:13 PM
    • Replies: 3
    • Views: 13,196
    04-27-2011, 02:11 AM Go to last post
  34. Assumptions for adding indicator variable

    Hi, can you please tell me the assumptions that are needed to be satisfied before adding indicator variables? I have searched on internet but I...

    Started by SadieKhan‎, 04-27-2011 12:25 PM
    • Replies: 2
    • Views: 3,130
    04-27-2011, 03:07 PM Go to last post
  35. Question Is this the right way to do things?

    So I have been trying to do a time-series regression to attempt to discover causality between a bunch of variables. I had 4 variables with around 25...

    Started by Royalty‎, 04-27-2011 11:41 AM
    • Replies: 1
    • Views: 1,578
    04-27-2011, 03:44 PM Go to last post
  36. inverse transformation and reflection

    Hi all, I'm doing a multiple regression analysis and my outcome variable is strongly positively skewed. Without transformation skewness = 2.10...

    Started by abuschgens‎, 04-29-2011 05:18 AM
    • Replies: 0
    • Views: 2,835
    04-29-2011, 05:18 AM Go to last post
  37. the t-values for regression coefficients

    How can I calculate the t-values of the regression coeffs if I have the sample size and the correlation matrix only? Is this possible? Thanks in...

    Started by liamplayt‎, 04-27-2011 11:04 PM
    regresion, t-test
    • Replies: 2
    • Views: 2,393
    04-29-2011, 09:13 AM Go to last post
  38. Impossible exam question!

    I just got done taking an exam by an evil and cruel professor who likes to throw in problems that he's never discussed in class, never assigned for...

    Started by danjohnson10‎, 04-27-2011 08:11 PM
    • Replies: 8
    • Views: 4,480
    04-29-2011, 11:00 PM Go to last post
  39. Talking House Price Regression - Need opinion and suggestion.

    Hi everyone, This is my very first time running regression(am very excited :D) and any opinion and suggestion will be very welcome !! I have...

    Started by Dude888‎, 04-12-2011 11:34 AM
    • Replies: 1
    • Views: 2,822
    04-30-2011, 01:06 AM Go to last post
  40. Multiple regression

    Hi, I have five factors for sixteen variables. I want to develop a regression expression for a dependent variable using the correlated variables....

    Started by tassi‎, 04-28-2011 11:43 AM
    • Replies: 1
    • Views: 1,827
    04-30-2011, 01:43 AM Go to last post
  41. Logistic Regression- Multicollinearity?

    Hi, I would really appreciate some guidance- I am running logistic regression equations with indepedent variables in SPSS, however there is a lot of...

    Started by pochi04‎, 04-29-2011 10:39 PM
    • Replies: 2
    • Views: 2,855
    04-30-2011, 12:31 PM Go to last post
  42. Statistical significance in linear vs logistic regression

    Hey all, I'm running a multiple linear regression with a continuous Y variable and five continuous X variables (including a continuous-continuous...

    Started by constantly‎, 04-30-2011 12:59 PM
    • Replies: 0
    • Views: 1,969
    04-30-2011, 12:59 PM Go to last post
  43. Confidence interval for coefficient of regression

    Hi, I dont understand how we can find the CI when we dont know what is n ? My question says. c) Assume that Se^2 =12.84 and V(β)= Se^2/(sumX^1)...

    Started by SadieKhan‎, 04-30-2011 02:19 PM
    • Replies: 2
    • Views: 2,904
    04-30-2011, 02:32 PM Go to last post
  44. Panel data, two measurment, what methods? Fixed effect models?

    In need of assistance! I have two datasets, one from 1998 and one from 2006 that have been merged using ID-numbers. In 1998 I measure if the...

    Started by inspire‎, 04-30-2011 04:24 PM
    • Replies: 0
    • Views: 1,488
    04-30-2011, 04:24 PM Go to last post
  45. Help with interpretation of Wald, chow, t-tests

    Sorry about the double post - it is in the elementary forum as well. But I should have put it here to begin with. Thanks in advance. I hope you...

    Started by nerdboy2317‎, 04-30-2011 01:16 AM
    • Replies: 1
    • Views: 6,963
    04-30-2011, 05:30 PM Go to last post
  46. Lightbulb Multiple Linear Regression w/ Categorical Predictor Variables (Linearity Assumption?)

    Hi, How do we test the linearity assumption for categorical predictor variables such as gender? What kind of a transformation do I need to use?

    Started by surveystat‎, 05-01-2011 04:04 AM
    • Replies: 0
    • Views: 3,184
    05-01-2011, 04:04 AM Go to last post
  47. Calculate the MSE of s-squared

    Consider the multiple regression model y=Xb+u where u~N(0,sigma-squared times identity) where b is a Kx1 vector, X is a non-stochastic full rank...

    Started by eBopBob‎, 05-01-2011 06:35 AM
    • Replies: 0
    • Views: 3,115
    05-01-2011, 06:35 AM Go to last post
  48. Regularized Canonical Correlation Analysis

    Hi, I have a question about sample size and regularized canonical correlation analysis. Is a sample size of 15 unreasonable to use in a regularized...

    Started by cupcake‎, 05-01-2011 08:05 PM
    canonical correlation, data analysis, regularized, sample size
    • Replies: 0
    • Views: 2,046
    05-01-2011, 08:05 PM Go to last post
  49. Stationarity of Seasonal Box-Jenkins Model

    We've been working on group projects where we were given a set a of seasonal data, and from it create a Box-Jenkins model. In class, we were that...

    Started by downthesun01‎, 05-03-2011 02:50 AM
    • Replies: 0
    • Views: 2,241
    05-03-2011, 02:50 AM Go to last post
  50. HELP PLEASE--Issue with Logistic Regression significance tests

    Hi, I have my independent work paper due on Tuesday, and I'm trying to test for the significance of specific variables for separate years 2003-11,...

    Started by TarHeel3007‎, 05-01-2011 01:27 AM
    • Replies: 1
    • Views: 2,852
    05-03-2011, 08:04 AM Go to last post
  51. Post Multiple regression - Best predictor

    Hello there! I am studying for a final exam next week and I'm not sure about this. How do we determine the "best predictor" in multiple...

    Started by johncuny‎, 05-03-2011 05:49 PM
    • Replies: 2
    • Views: 7,601
    05-04-2011, 08:23 AM Go to last post
  52. Calculating confidence bands for nonlinear regression

    Hi, I am trying to find a way to calculate the 95% confidence bands for nonlinear regression. I have found the following text on the web, but I do...

    Started by Dolphin72‎, 05-05-2011 11:53 AM
    confidence bands, nonlinear, regression
    • Replies: 0
    • Views: 2,806
    05-05-2011, 11:53 AM Go to last post
  53. Did I just fudge this categorical data transformation too much?

    I have a public data set gathered from 336 hospitals, with about 28,000 rows. I want to see if there is relationship between a particular input...

    Started by greg.neyman‎, 05-02-2011 04:33 PM
    categorical data analysis, dummy variables
    • Replies: 7
    • Views: 3,746
    05-05-2011, 05:05 PM Go to last post
  54. Special case of independent variable

    Hi guys, I have a question on how to deal with a specific independent variable in a logistic regression model. The independent variable is a...

    Started by eylan‎, 05-06-2011 02:31 AM
    • Replies: 0
    • Views: 1,712
    05-06-2011, 02:31 AM Go to last post
  55. Some help with exam preparation please

    Hi everyone! I'm studying for a stats exam and I am stuck on a few questions. Any help would be appreciated. Here are the coefficients and S.E.s...

    Started by Diane86‎, 05-04-2011 05:10 AM
    • Replies: 3
    • Views: 1,932
    05-06-2011, 12:55 PM Go to last post
  56. Help with regression SpSS

    I am currently working on my master's thesis on Drunk Driving. Unfortunately my chair is very unhelpful and we have had lack of training using SPSS...

    Started by natas‎, 05-06-2011 02:18 PM
    • Replies: 0
    • Views: 1,769
    05-06-2011, 02:18 PM Go to last post
  57. Demonstrate that dependent variable is correlated with random error term

    The hint - show that if e rises, dependent variable Y also rises. C=a+bY+e Y=C+I C - consumption function Y - GDP I - investment e...

    Started by E574‎, 05-06-2011 05:47 PM
    • Replies: 0
    • Views: 2,661
    05-06-2011, 05:47 PM Go to last post
  58. Data for regression analysis

    I am helping a friend with a project involving regression analysis. First off he wants to know if there is a way to determine if the extracted data...

    Started by c2q‎, 05-06-2011 06:43 PM
    • Replies: 4
    • Views: 2,381
    05-07-2011, 11:53 AM Go to last post
  59. Question regarding dummy variable and parameter equation.

    Hi, I am doing assignment and it requires me to develop a conceptual model and parameter equivalent to show my understanding in data analysis. So,...

    Started by musmus86‎, 05-08-2011 07:45 AM
    • Replies: 0
    • Views: 1,984
    05-08-2011, 07:45 AM Go to last post
  60. Regression Analysis w/Dummy Variable

    I am trying to run a regression on a dataset. The dataset has the regions listed as 1, 2, 3, and 4. To run a regression, do i need to recode these...

    Started by oxygen‎, 05-07-2011 08:46 AM
    dummy variable, effect, regression, relationship
    • Replies: 2
    • Views: 3,037
    05-09-2011, 10:49 AM Go to last post

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