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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Regression Help! to predict performance using the output of questionaire

    Hi All, Somebody pl. helpe me in the brlow case, As a part of academic project, im intrested in measuring performance of purchase dpeartment in a...

    Started by Arjun‎, 02-22-2012 05:08 AM
    multiple regression, regression analysis
    • Replies: 13
    • Views: 3,000
    02-28-2012, 01:12 AM Go to last post
  2. Articles/information on robust regression?

    Hi, I am a little confused as to what methods there are for "robust" regression. I thought it was an actual type (as in logistic, linear, etc),...

    Started by statn00b‎, 02-23-2012 09:05 AM
    • Replies: 5
    • Views: 2,366
    02-26-2012, 07:32 PM Go to last post
  3. how many time dummies in pooled regression?

    Hi guys, I want to perform a cross sectional time series regression - fixed effects model. Am I correct that it is better to group time by time...

    Started by SylviaS‎, 02-23-2012 08:44 AM
    • Replies: 2
    • Views: 3,437
    02-26-2012, 06:43 PM Go to last post
  4. Is this an instance of simultaneity? Can you help me understand why?

    I cant seem to figure this out, as standard descriptions of simultaneity in econometrics textbooks don't quite seem to fit. 1. I have panel data...

    Started by andrewcd‎, 02-24-2012 10:45 PM
    • Replies: 0
    • Views: 1,641
    02-24-2012, 10:45 PM Go to last post
  5. multivariate logistic regression

    Hello, I need to perform multivariate logistic regression on 3 binary variables. My independent variables are also categorical (3-10 levels)...

    Started by szm‎, 02-23-2012 07:38 PM
    logistic regression, multivariate, multivariate logistic reg, sas
    • Replies: 1
    • Views: 2,252
    02-24-2012, 10:09 AM Go to last post
  6. Stats Help Regression

    Hi, Do you know what kind of regression tests I should run for this and how to run them? Thanks for your help. Attached is the file.

    Started by baller99‎, 02-23-2012 04:40 PM
    • Replies: 4
    • Views: 1,747
    02-23-2012, 06:36 PM Go to last post
  7. Regression of Conditional Expectations E[Y|X,Z=z] = f(E[X|Z=z])

    Hello all, I have a regression problem I'm interested in that seem like it should be a fairly common and well understood, but due to my weak...

    Started by NITHOS‎, 02-23-2012 01:12 PM
    • Replies: 0
    • Views: 1,613
    02-23-2012, 01:12 PM Go to last post
  8. Regression on Composite Rates

    I have what may be a simple question, but I have been unable to find an appropriate methodology, and I am hoping that one of you may be able to help....

    Started by BrandonB‎, 02-22-2012 06:26 PM
    • Replies: 0
    • Views: 2,496
    02-22-2012, 06:26 PM Go to last post
  9. Interpreting mean centered polynomial regression

    Hi, I'm running a simple OLS regression and want to examine non-linear effects. Therefore I have included a square term of the independent...

    Started by economix‎, 02-21-2012 02:56 PM
    • Replies: 0
    • Views: 2,967
    02-21-2012, 02:56 PM Go to last post
  10. Number of Observations Question

    I am currently completing a research project on a certain type of fund. I would like to conduct a time series. It is my aim to analyse the...

    Started by Student_Researcher‎, 02-21-2012 11:47 AM
    number of observations
    • Replies: 0
    • Views: 1,511
    02-21-2012, 11:47 AM Go to last post
  11. Regression on Counts

    Hi, I have data on number of laps mice have run over several days after an injection (simulate injury) and receiving one of two treatments...

    Started by ted‎, 02-14-2012 01:29 PM
    • Replies: 7
    • Views: 2,560
    02-20-2012, 04:09 PM Go to last post
  12. Question Ordered Logit Model

    Using the World Values Survey (http://www.wvsevsdb.com/wvs/WVSData.jsp), I am trying to run an ordered logit model on a continuous dependent variable...

    Started by toddsqui‎, 02-19-2012 05:14 PM
    • Replies: 1
    • Views: 1,899
    02-20-2012, 12:48 PM Go to last post
  13. Question regarding changes in the value of coefficients

    I am not sure how to answer part A of this question. Thank you!

    Started by shle‎, 02-20-2012 12:16 AM
    • Replies: 3
    • Views: 2,238
    02-20-2012, 05:18 AM Go to last post
  14. Why does efficiency matter

    In a discussion of my old favorite non-normal data, Fox notes that while CI and test of signficance are commonly not effected much by nonnormality in...

    Started by noetsi‎, 02-16-2012 02:01 PM
    • Replies: 5
    • Views: 1,738
    02-17-2012, 11:49 AM Go to last post
  15. Grouping response in logistic regression

    Hi, I'm new to statistics and hope to find some help here. I can't find any information on why in logistic regression a binary response is often...

    Started by caro‎, 02-17-2012 08:03 AM
    • Replies: 2
    • Views: 1,981
    02-17-2012, 11:10 AM Go to last post
  16. Calculating adjusted treatment means in regression

    Hi, I have two treatment groups, intervention (n=76) and control (n=156). I have a dependent variable, weight, and a couple of baseline variables...

    Started by Statstastic‎, 02-16-2012 07:14 AM
    • Replies: 1
    • Views: 2,468
    02-16-2012, 03:08 PM Go to last post
  17. 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: 5,958
    02-16-2012, 02:06 PM Go to last post
  18. 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: 12,627
    02-16-2012, 12:47 PM Go to last post
  19. 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: 2,197
    02-16-2012, 12:40 PM Go to last post
  20. 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: 3,727
    02-15-2012, 03:45 PM Go to last post
  21. 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: 2,454
    02-15-2012, 03:13 AM Go to last post
  22. 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: 13,780
    02-15-2012, 12:22 AM Go to last post
  23. 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: 1,792
    02-14-2012, 12:31 PM Go to last post
  24. 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: 1,762
    02-14-2012, 12:29 PM Go to last post
  25. 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: 3,323
    02-13-2012, 07:51 PM Go to last post
  26. 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: 1,685
    02-13-2012, 01:57 PM Go to last post
  27. 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: 1,464
    02-13-2012, 10:24 AM Go to last post
  28. 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: 2,636
    02-13-2012, 09:50 AM Go to last post
  29. 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: 10,543
    02-13-2012, 09:45 AM Go to last post
  30. 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: 5,260
    02-13-2012, 09:20 AM Go to last post
  31. 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: 2,454
    02-12-2012, 02:11 PM Go to last post
  32. 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: 1,350
    02-11-2012, 07:08 PM Go to last post
  33. 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: 1,583
    02-11-2012, 02:19 AM Go to last post
  34. 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: 2,559
    02-10-2012, 06:29 PM Go to last post
  35. 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: 1,779
    02-10-2012, 02:17 PM Go to last post
  36. 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: 2,437
    02-10-2012, 10:16 AM Go to last post
  37. 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: 2,233
    02-09-2012, 11:31 PM Go to last post
  38. 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: 2,216
    02-09-2012, 06:03 PM Go to last post
  39. 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: 1,689
    02-09-2012, 05:35 PM Go to last post
  40. 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: 1,439
    02-09-2012, 04:20 PM Go to last post
  41. 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: 2,997
    02-09-2012, 12:15 AM Go to last post
  42. 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: 2,180
    02-07-2012, 08:23 PM Go to last post
  43. 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: 1,623
    02-07-2012, 10:36 AM Go to last post
  44. 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: 1,328
    02-07-2012, 07:28 AM Go to last post
  45. 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: 2,942
    02-06-2012, 02:09 PM Go to last post
  46. 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: 3,756
    02-05-2012, 01:44 PM Go to last post
  47. 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: 2,410
    02-03-2012, 01:04 PM Go to last post
  48. 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: 1,827
    02-03-2012, 11:11 AM Go to last post
  49. 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: 2,149
    02-03-2012, 10:23 AM Go to last post
  50. 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: 2,511
    02-03-2012, 05:08 AM Go to last post
  51. [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: 4,769
    02-03-2012, 03:10 AM Go to last post
  52. 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: 4,224
    02-02-2012, 10:25 AM Go to last post
  53. 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: 7,976
    02-02-2012, 08:51 AM Go to last post
  54. 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: 9,213
    02-01-2012, 12:23 AM Go to last post
  55. 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: 2,508
    01-31-2012, 08:25 AM Go to last post
  56. 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: 14,077
    01-31-2012, 02:15 AM Go to last post
  57. 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: 6,598
    01-30-2012, 01:26 PM Go to last post
  58. 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: 2,112
    01-30-2012, 08:09 AM Go to last post
  59. 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: 4,076
    01-30-2012, 06:43 AM Go to last post
  60. 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: 1,417
    01-28-2012, 01:03 PM Go to last post

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