1. 10-14-2010
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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Error in data matrix, least square error analysis

    Dear all, I am trying to reach an expression for the mean square error (mse) when the data matrix 'A' in the classical least square problem Ax=b...

    Started by sensor101‎, 02-10-2012 01:17 PM
    • Replies: 0
    • Views: 879
    02-10-2012, 01:17 PM Go to last post
  2. Regression Rookie Seeks Help

    Hi I have some data that i have been trying to use regression on. I have done individual regression analysis on Minitab 16 but was wondering is...

    Started by StuckWithStatsStan‎, 02-09-2012 05:54 PM
    • Replies: 14
    • Views: 1,430
    02-10-2012, 09:16 AM Go to last post
  3. 95% Intervals

    I'm new here (and relatively new to statistics) so I apologize if this thread is in the wrong place. I have a problem that seems relatively easy...

    Started by bravo3‎, 02-05-2012 05:10 PM
    confidence intervals, normal distribution, tolerance intervals
    • Replies: 4
    • Views: 1,266
    02-09-2012, 10:31 PM Go to last post
  4. Building a Logisics regression model - help

    Audited ~50 patients, and collected 10 potential predictors for each (some quantitative, some indicative, all independent). Trying to develop a...

    Started by j_cocker‎, 02-09-2012 04:49 AM
    • Replies: 6
    • Views: 1,290
    02-09-2012, 05:03 PM Go to last post
  5. Relation between 2 linear regression curves

    Hello Everyone, I'm new here, I'm hoping someone may be able to help me as Im a bit stuck. Its probably so simple but for some reason this problem...

    Started by gypsyeyes‎, 02-07-2012 08:25 PM
    • Replies: 3
    • Views: 919
    02-09-2012, 04:35 PM Go to last post
  6. Help--A basic linear regression problem

    This equations are come from a text book. I want to know that why (I-H)Xβ disappeared in the last formula. Thanks a lot.

    Started by Jason222‎, 02-09-2012 03:06 PM
    • Replies: 2
    • Views: 946
    02-09-2012, 03:20 PM Go to last post
  7. Lowest Mean Squared Error doesn't mean highest R^2?

    Question: Well, the title says it already. Does the lowest Mean Squared Error not automatically mean the highest R^2? Reason for asking: I'm doing...

    Started by Jolien‎, 02-06-2012 08:52 PM
    • Replies: 5
    • Views: 1,419
    02-08-2012, 11:15 PM Go to last post
  8. Interpreting regression analysis results help

    I am trying to analyse some medical data looking at a possible link between various variables (patient age, period on specific medication, medication...

    Started by j_cocker‎, 02-06-2012 05:37 PM
    • Replies: 4
    • Views: 1,271
    02-07-2012, 07:23 PM Go to last post
  9. Centering IVs for checking interaction effects in regression analysis

    Attention: I have just skimmed an article (Echambadi, R. and Hess, J.d. (2007) Mean-Centering Does Not Alleviate Collinearity Problems in Moderated...

    Started by MrChris86‎, 02-07-2012 09:36 AM
    centering, interaction, regression analysis
    • Replies: 0
    • Views: 1,073
    02-07-2012, 09:36 AM Go to last post
  10. Geographically Weighted Regression

    Hi, I am working on a project that aims to find any relationships between respiratory health with different environmental variables. I am...

    Started by lau86‎, 02-06-2012 07:00 AM
    • Replies: 1
    • Views: 683
    02-07-2012, 06:28 AM Go to last post
  11. Random Regression Analysis

    I posted this in the R forum, which was the incorrect place to put this I think. I have a set of data that includes: 15 repeated measures for...

    Started by segerfan83‎, 02-06-2012 01:09 PM
    • Replies: 0
    • Views: 1,628
    02-06-2012, 01:09 PM Go to last post
  12. Linear model accounting for fixed effects vs. ordered probit

    I originally ran an ordered probit model on an ordinal dependent variable (values 1-12), however in order to account for fixed effects in my analysis...

    Started by ARW90‎, 02-04-2012 09:38 AM
    econometrics, fixed effects, ordered, probit
    • Replies: 3
    • Views: 2,143
    02-05-2012, 12:44 PM Go to last post
  13. Question about Regression and relationship testing

    Hello, I am working on a project that is trying to look a possible correlation between BMI and various outcomes in a patient group. So the BMI...

    Started by artaxerxes‎, 02-03-2012 09:24 AM
    • Replies: 5
    • Views: 1,268
    02-03-2012, 12:04 PM Go to last post
  14. Smile [REGRESSION - REPEATED MEASURES] testing interactions with criterion scaling

    Hello everyone, I have a question about the criterion scaling method of analysing repeated-measures designs (Pedhazur, 1977). As far as I...

    Started by Lara333‎, 02-03-2012 10:11 AM
    • Replies: 0
    • Views: 1,174
    02-03-2012, 10:11 AM Go to last post
  15. Smile testing whether the role of a predictor differs between two dependent variables

    I have some questions about an analysis I am running. Sorry if they are very basic questions or completely off-course, but some help would be greatly...

    Started by Lara333‎, 02-01-2012 09:08 AM
    comparing coefficients, regression analysis
    • Replies: 7
    • Views: 1,415
    02-03-2012, 09:23 AM Go to last post
  16. Logistic regression residual diagnostics

    Hi, I am currently performing some logistic regression analysis and struggle with my residual diagnostics. I'm using glmfit in matlab and i get the...

    Started by jockem‎, 02-03-2012 04:08 AM
    • Replies: 0
    • Views: 1,184
    02-03-2012, 04:08 AM Go to last post
  17. [SOLVED] How to interpret negative regression estimate?

    Hi, Im learning about regression analysis and have negative estimates for the grade-point average variable in two categories of a multinomial...

    Started by elle-mnop‎, 02-02-2012 04:50 PM
    • Replies: 10
    • Views: 3,187
    02-03-2012, 02:10 AM Go to last post
  18. Non-Significant Categorical Predictor in Logistic Regression

    hi: In the logistic regression modeling one of my predictor is categorical with 4 categories. We use 3 categories considering one as reference...

    Started by navibs‎, 02-02-2012 08:21 AM
    • Replies: 2
    • Views: 2,057
    02-02-2012, 09:25 AM Go to last post
  19. Question Significant regression coefficient vs. significant overall model

    Hi everyone, I have rather a simple question but for some reason have not been able to find a clear answer. My apologies if I have missed a...

    Started by Lara333‎, 02-01-2012 08:57 AM
    multiple regression, significance
    • Replies: 2
    • Views: 5,157
    02-02-2012, 07:51 AM Go to last post
  20. Use of regression models with centered variables

    Hi all, I'm a little confused about how to use a regression model with centered variables. I know how centering variables works for reducing...

    Started by Ytrack‎, 01-30-2012 09:37 PM
    centering variables, interaction terms, regression
    • Replies: 6
    • Views: 6,772
    01-31-2012, 11:23 PM Go to last post
  21. weighted left-censored regression

    Hello, does anyone know how to do "weighted left-censored regression" of data to the lognormal distribution in R/Matlab? Thanks

    Started by mihy255‎, 01-31-2012 07:25 AM
    • Replies: 0
    • Views: 891
    01-31-2012, 07:25 AM Go to last post
  22. back-transformation of logit-transformed behavioral data

    Hello, I am posting with hopes that someone can assist me in making sure that I am back-transforming my data correctly. I have behavioral data...

    Started by rtoaff‎, 01-29-2012 01:27 AM
    • Replies: 12
    • Views: 10,276
    01-31-2012, 01:15 AM Go to last post
  23. Need help on ( unadjusted and adjusted w / 95% cl) odds ratio

    I am doing Logistic regression on spss. My dependent variable is test result (+ or -) independent variables are Age and Gender (M,F). How can i get...

    Started by zqkal‎, 01-30-2012 12:24 PM
    • Replies: 1
    • Views: 4,509
    01-30-2012, 12:26 PM Go to last post
  24. Fitting Regression Lines to Data

    I'm trying classify how much certain stock/stock prices trend, by using the slope of the regression line based on the price movements. However, I'm...

    Started by jojo400‎, 01-28-2012 07:55 PM
    • Replies: 1
    • Views: 938
    01-30-2012, 07:09 AM Go to last post
  25. Question: Time-Series-Cross-Section Data

    My data: Number of units: 290. Number of years: 4. The units are not sampled. Analysis technique I was thinking of doing an ordinary least...

    Started by Phontastik‎, 01-19-2012 06:12 AM
    • Replies: 3
    • Views: 2,526
    01-30-2012, 05:43 AM Go to last post
  26. Strategies for improving homogeneity

    OK, it has been a long time (like 25 years) since I have done much regression work and could use some suggestions. I know what a residual plot...

    Started by hodag‎, 01-27-2012 02:23 PM
    • Replies: 2
    • Views: 596
    01-28-2012, 12:03 PM Go to last post
  27. difference between 2x2-table and binary logistic regression

    Hello, I have to find out what is the (conceptual) difference between the tests. I don't really know what my means. I know they ARE different, but...

    Started by Lychee‎, 01-27-2012 10:42 AM
    • Replies: 4
    • Views: 1,567
    01-27-2012, 12:54 PM Go to last post
  28. Multiple regression problem S Shape Residuals

    Hello: I have posted this question before but wanted to give a more thorough explanation of my problem so as to hopefully garner some assistance. I...

    Started by need‎, 01-26-2012 08:37 AM
    • Replies: 11
    • Views: 2,996
    01-26-2012, 09:16 PM Go to last post
  29. Interpretation of high R2 with curvature in residuals and significant lack of fit

    Hello: I have a multiple regression model that shows 91% R^2 but has an s-shaped residuals plot and a significant lack of fit test. I am trying to...

    Started by need‎, 01-25-2012 03:30 PM
    • Replies: 2
    • Views: 2,194
    01-26-2012, 07:27 PM Go to last post
  30. Plotting Interaction between Two Nominal and One Quantitative IVs

    Hi all, I am curious about plotting regression interactions. The detail of my design is as follows: Independent variables: A (nominal, 2 levels:...

    Started by nathan3073‎, 01-26-2012 05:23 PM
    • Replies: 0
    • Views: 818
    01-26-2012, 05:23 PM Go to last post
  31. Reason for Higher Correlation weight Being Non-Significant

    Hi everyone, I ran a multilevel model using proc mixed. I obtained the following results. I ran a single regression using two scales as...

    Started by njacobson88‎, 01-26-2012 02:24 PM
    • Replies: 0
    • Views: 461
    01-26-2012, 02:24 PM Go to last post
  32. Exclamation Multi linear regression

    Hello everyone, I am new here (and to stats in general). Anyway I am working on a project where I want to predict the value of an outcome and I...

    Started by JohnLock‎, 01-23-2012 06:24 AM
    multi linear regression
    • Replies: 7
    • Views: 1,769
    01-26-2012, 11:57 AM Go to last post
  33. multinomial logit, marginal effects all insignificant!

    Dear users, I am estimating a multinomial logit model. Concerning my coefficients, I find some variables being significant. After estimating the...

    Started by Stevens_Berlin‎, 09-30-2011 05:37 AM
    • Replies: 1
    • Views: 2,640
    01-25-2012, 03:49 PM Go to last post
  34. Collinearity Among Categorical Variables in Regression

    Does anyone have any knowledge and/or experience in how to measure collinearity between categorical variables that have more than 2 categories in the...

    Started by jastingo‎, 01-21-2012 04:40 PM
    • Replies: 6
    • Views: 25,061
    01-25-2012, 02:52 PM Go to last post
  35. R2 vs lack of fit

    Hello: I am working with a multiple regression model where I see a 91% R2 but significant lack of fit with pure error. I also have a slighly...

    Started by need‎, 01-25-2012 12:49 PM
    • Replies: 4
    • Views: 1,849
    01-25-2012, 01:57 PM Go to last post
  36. Converting Group Centroids into Original Measurement Units in DFA

    I used SPSS to perform a discriminant function analysis on leg length which I am using to differentiate males and females in my sample. New measures...

    Started by ckevinbarrett‎, 01-25-2012 11:34 AM
    centroids, cut-off, dfa, discriminant, mahalanobis
    • Replies: 2
    • Views: 1,191
    01-25-2012, 11:54 AM Go to last post
  37. non zero mean gaussian error in least squares

    Dear all, I have the classic Least squares problem Ax=b, but with Gaussian noise at both A and b. I found out that total least squares can be...

    Started by samweckx‎, 01-25-2012 10:29 AM
    • Replies: 0
    • Views: 1,494
    01-25-2012, 10:29 AM Go to last post
  38. IV probit and Ivreg

    Hello, When I use ivreg in Stata and cluster standard errors my results show that the independent variable is significant. However, when I use...

    Started by carmen256‎, 01-23-2012 01:31 PM
    probit, regression analysis, results
    • Replies: 0
    • Views: 1,805
    01-23-2012, 01:31 PM Go to last post
  39. Polynomial Regression interpretation

    I have 2 questions that I need help interpreting: 1. Y = 47.31051 + 1.06914(X) - .01383(X^2) Because X is used twice (and one of them is a...

    Started by lancearmstrong1313‎, 01-23-2012 09:43 AM
    • Replies: 2
    • Views: 9,437
    01-23-2012, 11:16 AM Go to last post
  40. Report Interaction Term Coefficients, SE, t, p, as well as the interaction?

    A bit of a basic question: I ran regression analyses to test moderating effects of gender and stress on anxiety. So, DV: Anxiety. IVs:...

    Started by statn00b‎, 01-19-2012 11:15 PM
    • Replies: 4
    • Views: 2,402
    01-23-2012, 04:01 AM Go to last post
  41. Relationship between correlation matrix and R square

    Hi there! I wonder if R-squared can be deemed a function of the correlation matrix (or the variance-covariance matrix)? The only ways to compute...

    Started by liamplayt‎, 01-21-2012 10:39 PM
    r squared
    • Replies: 2
    • Views: 4,671
    01-22-2012, 08:54 AM Go to last post
  42. Logistic Regression: Testing for interaction effects with many covariates

    Hello everyone! As topic states, I am running a logistic regression with quite a lot of independent variables (23). There are a lot more candidate...

    Started by makadiwa‎, 01-20-2012 03:22 AM
    interaction, logit, stata
    • Replies: 3
    • Views: 7,037
    01-20-2012, 12:01 PM Go to last post
  43. Variance Extracted and Multicollinearity in Structural Equation Model

    Hello, I am a new user here, and I am quite in need of help with regards to statistical problems. :) I really appreciate it if anyone can help me. ...

    Started by Iori‎, 01-20-2012 11:56 AM
    ave, lisrel, multicollinearity, sem, variance extracted
    • Replies: 0
    • Views: 3,481
    01-20-2012, 11:56 AM Go to last post
  44. Post hoc in ANCOVA

    I'm trying to conduct a post hoc test on the results of an ANCOVA: > model <- aov(Max~Weight*Diet) > summary(model) But when I run the Tukey...

    Started by Oritteropus‎, 01-18-2012 04:39 AM
    • Replies: 5
    • Views: 4,459
    01-20-2012, 06:59 AM Go to last post
  45. Negative linear regression (time value)

    hey all, I'm working on a basic program for calculating the time remaining as a battery of a device runs down from 100% (full) to 0% (empty). ...

    Started by diryfishtank‎, 01-19-2012 03:42 AM
    linear regression, negative, time
    • Replies: 1
    • Views: 867
    01-19-2012, 11:57 AM Go to last post
  46. How to prove E(SSE)=(n-2)singma^2 ???

    I'd like to know to how to prove E(SSE)=(n-2)singma^2 (SSE=Syy-BetaHat1*Sxy) . Ive been workin' on it for many days but still cant figure it out....

    Started by jamerse‎, 01-18-2012 03:17 AM
    • Replies: 4
    • Views: 7,612
    01-19-2012, 09:44 AM Go to last post
  47. Mixed model with invariant dependent variable?

    First off, full disclosure. I am an engineer by trade. I have some grad-level statistics under my belt, which means I know enough to be dangerous....

    Started by shamrock‎, 01-11-2012 10:07 PM
    • Replies: 12
    • Views: 1,868
    01-19-2012, 09:06 AM Go to last post
  48. Enter the product term of 2 variables in linear regression?

    How can you enter the product term of 2 variables in linear regression? One is gender (categorical) and the other one is continous (Scored 1-200). ...

    Started by statn00b‎, 01-18-2012 12:11 PM
    • Replies: 1
    • Views: 1,315
    01-19-2012, 03:15 AM Go to last post
  49. moderator as a categorical variable -- really desperate please help!!!!

    1. how do you conduct moderation analysis in SPSS when the moderator is a categorical variable (3 levels represented respectively by +1 (active...

    Started by peggy217‎, 01-18-2012 11:23 AM
    • Replies: 2
    • Views: 1,630
    01-18-2012, 11:29 PM Go to last post
  50. Iv probit

    Hi, Is there a procedure to estimate a probit model in SAS using instrumental variables, like the IVPROBIT in STATA? Thanks!

    Started by SBODILSEN‎, 01-18-2012 06:13 AM
    • Replies: 2
    • Views: 2,104
    01-18-2012, 10:26 PM Go to last post
  51. Logistic regression problem

    Hi, I'm experiencing difficulties with understanding my results despite active googling, and i'd be really grateful, if someone could help me. ...

    Started by kati‎, 01-18-2012 07:13 PM
    • Replies: 5
    • Views: 1,596
    01-18-2012, 10:01 PM Go to last post
  52. Assumptions of Linear Regression and Time Series

    Greetings, I am kind of confused while reading topics of Linear Regression and Time Series. There are bunch of assumptions to infer proper...

    Started by cozgenc‎, 01-18-2012 07:20 AM
    • Replies: 1
    • Views: 5,834
    01-18-2012, 11:05 AM Go to last post
  53. Am i understanding Regression analysis? Theory question

    Lets say, I have a list of all the hall of fame outfielders in MLB history. Along with data on, fielding ability, OBP, etc. Can I set up a...

    Started by morid22‎, 01-17-2012 02:05 PM
    • Replies: 1
    • Views: 1,115
    01-17-2012, 03:01 PM Go to last post
  54. IV results interpretation

    Hello, I have an endougenous variable x and an instrument for it, variable z. The instrument is (significantly) negatively related to x. My...

    Started by carmen256‎, 01-17-2012 06:24 AM
    instrumental variables, interpretation, output
    • Replies: 0
    • Views: 862
    01-17-2012, 06:24 AM Go to last post
  55. stats var

    The message you have entered is too short. Please lengthen your message to at least 10 characters.

    Started by matlabber‎, 01-16-2012 06:46 PM
    • Replies: 1
    • Views: 934
    01-16-2012, 08:29 PM Go to last post
  56. using variance matrix

    If you have a vector Q = , where Qi is a random variable, and a variance matrix var(Q) = how do you find the variance for Q1,Q2? Is there a...

    Started by matlabber‎, 01-16-2012 04:16 PM
    var stats
    • Replies: 4
    • Views: 1,336
    01-16-2012, 06:36 PM Go to last post
  57. unable to make model Hessian positive definite - help!

    Hello all, My first time posting here, and really hoping that someone can help me out! I have data from a repeated measures experiment in which...

    Started by rtoaff‎, 01-16-2012 09:10 AM
    covariance structure, hessian positive definite, proc mixed, repeated measures
    • Replies: 0
    • Views: 3,526
    01-16-2012, 09:10 AM Go to last post
  58. How to Guard Against Negative Probabilities in Multilevel Proportional Odds Model?

    In SAS, it provides a "bound statement" to prevent negative probabilities for multilevel proportional odds model. How can I guarantee postive...

    Started by tonymtc‎, 01-15-2012 09:35 PM
    • Replies: 0
    • Views: 736
    01-15-2012, 09:35 PM Go to last post
  59. Graphical representation and functions of non parametric confidence intervals

    I calculated the 95% confidence intervals for alpha and beta coefficients through non parametric bootstrapping (10000 iterations). Now, I'd like to...

    Started by Oritteropus‎, 01-12-2012 04:18 AM
    • Replies: 2
    • Views: 1,536
    01-15-2012, 06:05 AM Go to last post
  60. Logistic regression (medicine)

    Dear all, I have patients N=104 group1 n=43 with mild form of disease A (A1) group2 n=61 with severe form of disease A (A2) every patient...

    Started by wellfor‎, 01-14-2012 06:36 PM
    • Replies: 4
    • Views: 994
    01-15-2012, 04:02 AM Go to last post

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