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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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 04:22 AM
    interaction, logit, stata
    • Replies: 3
    • Views: 9,858
    01-20-2012, 01:01 PM Go to last post
  2. 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 11:39 PM
    r squared
    • Replies: 2
    • Views: 7,031
    01-22-2012, 09:54 AM Go to last post
  3. 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, 01-20-2012 12:15 AM
    • Replies: 4
    • Views: 3,492
    01-23-2012, 05:01 AM Go to last post
  4. 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 10:43 AM
    • Replies: 2
    • Views: 13,419
    01-23-2012, 12:16 PM Go to last post
  5. 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 02:31 PM
    probit, regression analysis, results
    • Replies: 0
    • Views: 4,058
    01-23-2012, 02:31 PM Go to last post
  6. 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 11:29 AM
    • Replies: 0
    • Views: 3,116
    01-25-2012, 11:29 AM Go to last post
  7. 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 12:34 PM
    centroids, cut-off, dfa, discriminant, mahalanobis
    • Replies: 2
    • Views: 2,070
    01-25-2012, 12:54 PM Go to last post
  8. 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 01:49 PM
    • Replies: 4
    • Views: 5,549
    01-25-2012, 02:57 PM Go to last post
  9. 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 05:40 PM
    • Replies: 6
    • Views: 34,839
    01-25-2012, 03:52 PM Go to last post
  10. 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: 5,319
    01-25-2012, 04:49 PM Go to last post
  11. 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 07:24 AM
    multi linear regression
    • Replies: 7
    • Views: 2,926
    01-26-2012, 12:57 PM Go to last post
  12. 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 03:24 PM
    • Replies: 0
    • Views: 968
    01-26-2012, 03:24 PM Go to last post
  13. 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 06:23 PM
    • Replies: 0
    • Views: 1,913
    01-26-2012, 06:23 PM Go to last post
  14. 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 04:30 PM
    • Replies: 2
    • Views: 3,223
    01-26-2012, 08:27 PM Go to last post
  15. 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 09:37 AM
    • Replies: 11
    • Views: 4,600
    01-26-2012, 10:16 PM Go to last post
  16. 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 11:42 AM
    • Replies: 4
    • Views: 3,416
    01-27-2012, 01:54 PM Go to last post
  17. 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 03:23 PM
    • Replies: 2
    • Views: 1,436
    01-28-2012, 01:03 PM Go to last post
  18. 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 07:12 AM
    • Replies: 3
    • Views: 4,100
    01-30-2012, 06:43 AM Go to last post
  19. 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 08:55 PM
    • Replies: 1
    • Views: 2,135
    01-30-2012, 08:09 AM Go to last post
  20. 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 01:24 PM
    • Replies: 1
    • Views: 6,625
    01-30-2012, 01:26 PM Go to last post
  21. 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 02:27 AM
    • Replies: 12
    • Views: 14,141
    01-31-2012, 02:15 AM Go to last post
  22. 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 08:25 AM
    • Replies: 0
    • Views: 2,529
    01-31-2012, 08:25 AM Go to last post
  23. 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 10:37 PM
    centering variables, interaction terms, regression
    • Replies: 6
    • Views: 9,242
    02-01-2012, 12:23 AM Go to last post
  24. 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 09:57 AM
    multiple regression, significance
    • Replies: 2
    • Views: 8,017
    02-02-2012, 08:51 AM Go to last post
  25. 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 09:21 AM
    • Replies: 2
    • Views: 4,238
    02-02-2012, 10:25 AM Go to last post
  26. [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 05:50 PM
    • Replies: 10
    • Views: 4,786
    02-03-2012, 03:10 AM Go to last post
  27. 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 05:08 AM
    • Replies: 0
    • Views: 2,556
    02-03-2012, 05:08 AM Go to last post
  28. 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 10:08 AM
    comparing coefficients, regression analysis
    • Replies: 7
    • Views: 2,156
    02-03-2012, 10:23 AM Go to last post
  29. 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 11:11 AM
    • Replies: 0
    • Views: 1,831
    02-03-2012, 11:11 AM Go to last post
  30. 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 10:24 AM
    • Replies: 5
    • Views: 2,423
    02-03-2012, 01:04 PM Go to last post
  31. 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 10:38 AM
    econometrics, fixed effects, ordered, probit
    • Replies: 3
    • Views: 3,813
    02-05-2012, 01:44 PM Go to last post
  32. 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 02:09 PM
    • Replies: 0
    • Views: 2,970
    02-06-2012, 02:09 PM Go to last post
  33. 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 08:00 AM
    • Replies: 1
    • Views: 1,335
    02-07-2012, 07:28 AM Go to last post
  34. 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 10:36 AM
    centering, interaction, regression analysis
    • Replies: 0
    • Views: 1,635
    02-07-2012, 10:36 AM Go to last post
  35. 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 06:37 PM
    • Replies: 4
    • Views: 2,197
    02-07-2012, 08:23 PM Go to last post
  36. 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 09:52 PM
    • Replies: 5
    • Views: 3,024
    02-09-2012, 12:15 AM Go to last post
  37. 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 04:06 PM
    • Replies: 2
    • Views: 1,453
    02-09-2012, 04:20 PM Go to last post
  38. 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 09:25 PM
    • Replies: 3
    • Views: 1,701
    02-09-2012, 05:35 PM Go to last post
  39. 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 05:49 AM
    • Replies: 6
    • Views: 2,233
    02-09-2012, 06:03 PM Go to last post
  40. 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 06:10 PM
    confidence intervals, normal distribution, tolerance intervals
    • Replies: 4
    • Views: 2,247
    02-09-2012, 11:31 PM Go to last post
  41. 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 06:54 PM
    • Replies: 14
    • Views: 2,449
    02-10-2012, 10:16 AM Go to last post
  42. 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 02:17 PM
    • Replies: 0
    • Views: 1,789
    02-10-2012, 02:17 PM Go to last post
  43. Maximum likelihood model estimation

    W3 is a duration variable. Values greater than or equal to 3 are incomplete durations. Estimate an appropriate model for this variable and show how...

    Started by samulleg364‎, 02-09-2012 12:58 PM
    • Replies: 8
    • Views: 2,571
    02-10-2012, 06:29 PM Go to last post
  44. Simple slopes tests for 4-way, mixed regression interaction - Please help!

    I have conducted a regression analysis that yields a significant 4-way interaction between: 2 dichotomous within-subjects variables 2 continuous...

    Started by ldtdata‎, 02-11-2012 02:19 AM
    continuous iv, dichotomous iv, mixed-model
    • Replies: 0
    • Views: 1,598
    02-11-2012, 02:19 AM Go to last post
  45. Need help with Regression Analysis

    Have a problem that I need help with if anyone can help me. The correlation between scores on tests of sociability and sense of humor was found...

    Started by statistichelp‎, 02-11-2012 06:50 PM
    • Replies: 1
    • Views: 1,356
    02-11-2012, 07:08 PM Go to last post
  46. Linear Regression mystery

    A linear model was built, using 2 explanatory variables and 30 observations. the results were: B=(3.57, -0.18, 1.259)^t (the coefficients) ...

    Started by Yankel‎, 02-12-2012 07:44 AM
    • Replies: 6
    • Views: 2,468
    02-12-2012, 02:11 PM Go to last post
  47. meaningful value for R squared

    Hi, I did a simple linear regression with two variables (X & Y), both scores that were calculated (mean) on the basis of scores for the items of...

    Started by lucn‎, 02-13-2012 04:37 AM
    • Replies: 3
    • Views: 5,296
    02-13-2012, 09:20 AM Go to last post
  48. Multiple Regression and Confounding Factors

    I am working on my thesis project which involves analyzing whether a dichotomous independent variable has an effect on a continuous dependent...

    Started by laura77‎, 02-12-2012 06:24 PM
    confounders, multiple regression
    • Replies: 3
    • Views: 10,581
    02-13-2012, 09:45 AM Go to last post
  49. Modelling problem

    Hi there! I have this modelling problem, and I'd like to get some input/ideas. My data are produced power and measured wind speed at a wind...

    Started by caoshaug‎, 02-07-2012 06:20 AM
    • Replies: 13
    • Views: 2,647
    02-13-2012, 09:50 AM Go to last post
  50. Multiple regression for duplicate payments

    Has anyone had any kind of experience using regression in financial and accounting areas for multiple or duplicate payments. thanks Vic

    Started by ssvictor‎, 02-13-2012 10:24 AM
    • Replies: 0
    • Views: 1,470
    02-13-2012, 10:24 AM Go to last post
  51. Dependent categorical variable

    If y is a dependent categorical variable (values 1,2,3) , then how would you show that y is dependent on x1 and x2? My rational is to use a...

    Started by samulleg364‎, 02-13-2012 01:06 PM
    • Replies: 2
    • Views: 1,697
    02-13-2012, 01:57 PM Go to last post
  52. Multiple regression in the analysis of telephone calls

    Hi everyone, I'm new to multiple regression and I'm having a few concerns about my analysis and I could do with some advice. Firstly, the...

    Started by jassco‎, 02-10-2012 08:19 AM
    • Replies: 13
    • Views: 3,356
    02-13-2012, 07:51 PM Go to last post
  53. marginal effect with wald test

    Hi there, In an econometrics assignment we have to check what variable has the largest and smallest marginal effect on our dependent variable wage....

    Started by davidmax1990‎, 02-14-2012 12:29 PM
    • Replies: 0
    • Views: 1,779
    02-14-2012, 12:29 PM Go to last post
  54. Predicting a Ratio, when the denominator of that Ratio is a logical weight variable

    I am attempting a basketball regression. The dataset is a bit complicated to explain, but basically each observation represents a stint of 5 players...

    Started by YaoPau‎, 02-14-2012 06:46 AM
    • Replies: 1
    • Views: 1,802
    02-14-2012, 12:31 PM Go to last post
  55. Nested ANOVA - Replication vs. Pseudoreplication - pulling hair out, please help

    Hello all, I am trying to run a nested ANOVA in JMP on some ecological field data - I'm trying to measure whether fish biomass is different in...

    Started by vogtro‎, 02-10-2012 08:09 PM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 13,848
    02-15-2012, 12:22 AM Go to last post
  56. Weibull MLE with right hand censoring

    I am having trouble writing the MLE function for a weibull distribution with right hand censoring at specific value. W(DURATION VARIABLE) X1 X2 ...

    Started by samulleg364‎, 02-14-2012 11:33 PM
    • Replies: 2
    • Views: 2,473
    02-15-2012, 03:13 AM Go to last post
  57. How to interpret/present interaction term

    I have survey dataset where I created a knowledge score.There are four possible right answers. I used this as continuous variables, and it checked...

    Started by smd19‎, 02-15-2012 12:41 PM
    • Replies: 2
    • Views: 3,764
    02-15-2012, 03:45 PM Go to last post
  58. Comparing regressions

    Hi, I want to conduct a sensitivity analysis on a regression to check if the results are highly influenced by the sample I have. Basically, I want...

    Started by Oritteropus‎, 02-16-2012 11:53 AM
    • Replies: 3
    • Views: 2,218
    02-16-2012, 12:40 PM Go to last post
  59. comparing regression coefficients from the same model

    Hi, I think this question has been answered in bits and pieces here and there, but I am still a bit unsure about what the best approach for this is:...

    Started by kk49‎, 02-14-2012 10:14 AM
    • Replies: 12
    • Views: 12,689
    02-16-2012, 12:47 PM Go to last post
  60. Is R squared number valid when forcing a slope on regression fit line?

    When I plot my log transformed data and do a regression fit, I get a slope of 3.37 and a r-squared of 0.96. My professor wants me to "force" a slope...

    Started by SeatOFpants‎, 02-15-2012 03:07 PM
    • Replies: 12
    • Views: 5,991
    02-16-2012, 02:06 PM Go to last post

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