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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Appropriate Regression Method?

    Hi guys, I'm relatively new to statistics, and I'm searching for an answer as to which regression method would be most appropriate for the problem...

    Started by MMack‎, 01-05-2015 11:22 PM
    • Replies: 4
    • Views: 2,002
    01-07-2015, 06:39 PM Go to last post
  2. Question about sampledistribution

    Hi, I have a question I was hoping someone could answer me. It goes as follows: The correlation r between two variables x_1 and x_2 equals 0.33....

    Started by WCTStats‎, 01-07-2015 10:50 AM
    • Replies: 3
    • Views: 1,194
    01-07-2015, 04:36 PM Go to last post
  3. Bayesian regression

    it's a actually an informatics math related question. But i want to start here to get a first opinion. As a software engineer and cryptographer, I'm...

    Started by ethomas‎, 01-07-2015 01:16 PM
    • Replies: 0
    • Views: 1,054
    01-07-2015, 01:16 PM Go to last post
  4. (SPSS) External validation for a linear regression model

    Hello, I am investigating relationships of continuous variables and I am aiming at getting a model that can be generalized for the study. My DV is...

    Started by wid‎, 01-02-2015 07:32 PM
    • Replies: 6
    • Views: 3,058
    01-06-2015, 06:49 AM Go to last post
  5. non-significant predictor became significant after including additional predictor?

    Hi everyone, I have a quick question concerning a program I am having in multiple regression. I have a working full mediation model, that is,...

    Started by jiaxiking‎, 01-04-2015 05:55 PM
    • Replies: 10
    • Views: 3,146
    01-05-2015, 09:37 PM Go to last post
  6. Variance inflation and interactions between variables?

    Hello everyone I am having trouble interpreting some of my results. I am using logistic regression to infer a model based on measured data....

    Started by enur‎, 08-03-2012 09:54 AM
    categorical data, gvif, interaction terms, logistic regression, vif
    • Replies: 8
    • Views: 13,777
    01-05-2015, 01:34 PM Go to last post
  7. multicollinearity of interaction term in binary logistic regression

    Hello, I would like to conduct a Binary Logistic Regression Analysis with a regression model containing a nominal 0/1-dummy variable (D) a...

    Started by anna_84‎, 01-05-2015 11:20 AM
    • Replies: 2
    • Views: 2,939
    01-05-2015, 01:20 PM Go to last post
  8. Omnibus F-stat insignificant, anything left to say about reg. coefficients?

    Hi there. I am calculating a multivariate regression by hand, and just calculated the F-stat for the model. Calculated F-stat = 4.899 Critical...

    Started by Kabouterke‎, 01-02-2015 06:58 PM
    • Replies: 6
    • Views: 2,430
    01-03-2015, 08:13 AM Go to last post
  9. Question Polynomial regression - Degree problem

    Hello, I would like to ask that how do I decide exactly what degree polynomial to use in my regression? I have attached the sample file. ...

    Started by Villalobos‎, 12-30-2014 03:37 PM
    • Replies: 9
    • Views: 2,745
    01-03-2015, 06:52 AM Go to last post
  10. How to find: Best fit regression Model

    Thank you so much in advance!

    Started by Niklas1392‎, 01-03-2015 06:21 AM
    best fit, linear regression, regression analysis
    • Replies: 0
    • Views: 1,428
    01-03-2015, 06:21 AM Go to last post
  11. Dealing with outliers

    We have this discussion from time to time, but it has become more pertinant to me now... Before I begin I should note that I am not really interested...

    Started by noetsi‎, 12-30-2014 10:09 AM
    • Replies: 7
    • Views: 3,525
    12-30-2014, 10:16 PM Go to last post
  12. Importance of bias in estimators

    I always thought that bias was the central issue in an estimator. The one thing you had to avoid above all else and the gold standard to evaluate the...

    Started by noetsi‎, 12-30-2014 01:32 PM
    • Replies: 12
    • Views: 3,198
    12-30-2014, 02:46 PM Go to last post
  13. Measurement error

    An econometrician I am reading notes that if the IV are measured with error the least square estimators are biased towards zero. I assume, I doubt...

    Started by noetsi‎, 12-30-2014 09:40 AM
    • Replies: 4
    • Views: 954
    12-30-2014, 02:34 PM Go to last post
  14. Multiple linear regression vs logistic regression

    I am not a statistician myself, and haven't done regressions for very long time and have a basic question. I need to do multiple regression for...

    Started by EricaW‎, 12-28-2014 03:30 PM
    • Replies: 5
    • Views: 2,471
    12-29-2014, 08:18 PM Go to last post
  15. External dataset validation of a binary logit model

    Hello all, i have developed a prognostic model using binomial logistic regression. Now i want to validate it in an external dataset. The standard...

    Started by Sheetal‎, 12-27-2014 08:30 AM
    logit validation
    • Replies: 1
    • Views: 1,538
    12-27-2014, 08:43 AM Go to last post
  16. Post Multivariate logistic regression analysis from patient data

    I would like to conduct a multivariate regression analysis on patient data using essentially the following setup: Dependent: a continuous...

    Started by muaaman‎, 12-24-2014 01:41 AM
    data, non-linear, options, patient, regression
    • Replies: 6
    • Views: 2,236
    12-27-2014, 06:05 AM Go to last post
  17. Logistic Regression

    Hii! I have some, I guess, pretty basic questions regarding logistic regression. I collected data and my dependent variable is, whether...

    Started by Lors‎, 12-26-2014 07:52 AM
    complete separation, logistic regression, spss
    • Replies: 1
    • Views: 1,779
    12-26-2014, 02:42 PM Go to last post
  18. Poll Poll: Question Regarding Regression in Biological Research--confusion over ordinal variable

    To begin with, I am relatively unfamiliar with advanced statistics; I am familiar with elementary statistics such as Chi Square and Kruskal-Wallis...

    Started by nddn‎, 12-25-2014 03:18 PM
    • Replies: 6
    • Views: 2,156
    12-26-2014, 02:21 PM Go to last post
  19. Thumbs up Using regression to compensate for matching?

    Suppose I am using four groups for a study: South Asian patients, n=41 First Nation patients, n=48 Arabic patients, n=26 South Asian controls,...

    Started by muaaman‎, 12-25-2014 10:05 AM
    compensation, controls, matching, patients, regression
    • Replies: 5
    • Views: 1,594
    12-26-2014, 04:51 AM Go to last post
  20. Endogenous variable

    Hi, can someone please explain in a simple way what does it mean "variable is correlated with the error term"? Thanks.

    Started by john_f‎, 12-21-2014 04:40 PM
    endogenous, regression, variable
    • Replies: 3
    • Views: 1,994
    12-22-2014, 05:05 AM Go to last post
  21. Is there a need to include fixed effects when assessing multicollinearity VIFs?

    I am currently in the progress of performing multicollinearity diagnostics for a logistic regression model using tolerance and VIF calculations based...

    Started by SuppaiKamo‎, 12-20-2014 12:44 PM
    fixed effects model, logistic regression, multicollinearity, regression, regression assumption
    • Replies: 0
    • Views: 1,476
    12-20-2014, 12:44 PM Go to last post
  22. count data with no zero counts, Poisson?

    Well I appear to have zero deflate data. I will likely treat it as multilevel with clusters, but I was wondering if there was a count approach (e.g.,...

    Started by hlsmith‎, 12-19-2014 08:26 PM
    • Replies: 3
    • Views: 2,754
    12-19-2014, 10:45 PM Go to last post
  23. Why does the coefficient change sign when another variable is added to the OLS model?

    Dear all, I am trying to run an OLS regression in Stata 13, with log of per capita calorie as my dependent variable and age and years of education...

    Started by monzur‎, 12-19-2014 03:53 PM
    • Replies: 7
    • Views: 5,726
    12-19-2014, 04:27 PM Go to last post
  24. Is this logit model a multilevel model, and what is the correct way to model it?

    I am analyzing a sample of about 6000 actions carried out by about 500 multinational companies in about 80 countries during a 6 year period. Actions...

    Started by SuppaiKamo‎, 12-19-2014 01:35 PM
    logistic regression, logit, multilevel analysis, multilevel model, multilevel modeling
    • Replies: 0
    • Views: 1,785
    12-19-2014, 01:35 PM Go to last post
  25. Regression Using Likert Scales (Total Scores)

    I conducted a survey that consisted of 5 different likert scales. I totaled the scores for each scale. I would like to know if the total scores of 4...

    Started by nelson5520‎, 12-18-2014 10:45 AM
    likert scale, multiple regression, ordinal logistic reg, regression analysis
    • Replies: 3
    • Views: 2,240
    12-18-2014, 02:17 PM Go to last post
  26. Goodness of fit measure for a MNL model

    Hello! I have carried out MNL regression with the same model among different samples and I now need to compare the results against each other. In...

    Started by Jüri‎, 12-18-2014 11:31 AM
    goodness of fit, mnl, mnl model
    • Replies: 1
    • Views: 1,691
    12-18-2014, 11:40 AM Go to last post
  27. significance intepretation DOLS

    the insignificant slopes in Time series regression become significant in DOLS. what general explanation can provide? other than- the use of...

    Started by chandana‎, 12-18-2014 10:59 AM
    • Replies: 0
    • Views: 1,159
    12-18-2014, 10:59 AM Go to last post
  28. Bounded or unbounded? Which regression?

    Hi, I have to do a regression analysis with a dependent variable which ranges from -5 to 12. Its distribution is given below. Can anybody suggests...

    Started by sant2910‎, 06-28-2012 08:39 AM
    regression, unbounded
    • Replies: 1
    • Views: 3,685
    12-18-2014, 10:19 AM Go to last post
  29. proving regression with dummy variables gives same estimates as separate models

    See attachment for problem description: To prove this I started by using: vector of Beta estimates for category k = , matrix of estimates for...

    Started by statsmeister‎, 12-16-2014 01:00 PM
    • Replies: 0
    • Views: 1,224
    12-16-2014, 01:00 PM Go to last post
  30. Prediction interval using a function that combines regression parameters

    I have a question about the prediction interval on a function that combines parameters obtained via linear regression. I was wondering if someone...

    Started by gwlucas‎, 12-16-2014 09:47 AM
    • Replies: 3
    • Views: 1,400
    12-16-2014, 11:18 AM Go to last post
  31. Question Fitting curves to dimensionless data sets

    I have a number of data sets that I have made non-dimensional across both the x and y axis, such that they range from 0 to 1. I want to fit curves...

    Started by yccmp‎, 12-16-2014 02:39 AM
    • Replies: 0
    • Views: 1,563
    12-16-2014, 02:39 AM Go to last post
  32. RegressIt: free Excel add-in for regression analysis

    Regression Analysis forum members: I'd like to announce the release of a free Excel add-in for regression and multivariate data analysis which is...

    Started by RegressIt‎, 05-30-2014 03:59 AM
    • Replies: 2
    • Views: 4,992
    12-15-2014, 06:41 PM Go to last post
  33. Question Generate model from known independent & dependent variables. Does this make sense?

    I am on a new job as a statistician, after studying stats some years ago. So please bear with me as I seek a solution to my problem. I'm trying...

    Started by bnew‎, 12-10-2014 04:52 PM
    known variables
    • Replies: 4
    • Views: 2,414
    12-15-2014, 05:56 PM Go to last post
  34. what is correlation???!!!!

    what is the meaning of correlation??????????

    Started by haraharae‎, 09-12-2014 12:45 PM
    • Replies: 4
    • Views: 1,774
    12-14-2014, 11:56 AM Go to last post
  35. Split sample regression vs Regression with interaction term

    Hi, I need some advice on using split sample regression versus regression with interaction term. My objective is to tell the difference, if any,...

    Started by wand‎, 12-12-2014 12:08 PM
    • Replies: 0
    • Views: 3,013
    12-12-2014, 12:08 PM Go to last post
  36. Predictions of new data based on an existing model

    Could someone help how to use an existing model (in this case it is model derived from discriminant analysis) to predict a new data set.

    Started by Cathy Carter‎, 12-10-2014 10:54 PM
    • Replies: 0
    • Views: 1,300
    12-10-2014, 10:54 PM Go to last post
  37. Hints/tips on what I should be looking for for economic signifiance

    uihgiuguiuoiuo

    Started by xinsaneik‎, 12-10-2014 02:21 PM
    • Replies: 0
    • Views: 1,082
    12-10-2014, 02:21 PM Go to last post
  38. Validate a model and select the best model fitted

    Hi, I have a doubt. I have fitted some data to different non linear models minimizing the sum of squares. Then I have calculated the AIC and BIC...

    Started by sanmath‎, 12-10-2014 12:01 AM
    • Replies: 0
    • Views: 1,017
    12-10-2014, 12:01 AM Go to last post
  39. 10 fold cross-validation

    I am looking at how good an experimental measures is to classify control group from a clinical group. I was asked to do 10-fold cross validation....

    Started by Cathy Carter‎, 12-09-2014 03:14 PM
    • Replies: 0
    • Views: 1,993
    12-09-2014, 03:14 PM Go to last post
  40. Post What does R, R square , Adjusted R square, STD error of estimates helps for ?

    Hello After I run out the regression analysis, can someone enlighten me what can I get from R, R square, STD Error estimates and the adjusted r...

    Started by hanialbarni‎, 12-06-2014 11:05 AM
    • Replies: 9
    • Views: 3,546
    12-08-2014, 06:40 PM Go to last post
  41. Help with creating a dummy variable with a categorical variable.

    I am very new to stats and this is not my thing. I need help in a class with creating dummy variables for the variable "education level". Im not...

    Started by cwcannon‎, 12-07-2014 10:06 PM
    • Replies: 1
    • Views: 1,439
    12-08-2014, 02:54 AM Go to last post
  42. Comparison of 2 models with observed data - identical R2?

    Hello! I am trying to compare field data with 2 models, but somehow both models give me identical R2. The models are derived from different sets...

    Started by iloveapple‎, 12-07-2014 06:49 AM
    r2 regression
    • Replies: 0
    • Views: 1,099
    12-07-2014, 06:49 AM Go to last post
  43. Multi-Level Options for Dataset

    Hello, I have a dataset of 15 subjects. Each subject has 12 scores that come from performing 7 tasks, so I have a total of 180 scores. The...

    Started by hlsmith‎, 12-05-2014 09:48 AM
    • Replies: 0
    • Views: 1,346
    12-05-2014, 09:48 AM Go to last post
  44. Regression analysis with nominal dependent variable

    Hello! In short: I'm having issues with figuring out a technique to measure how well does a categorical variable explain variation among a nominal...

    Started by Jüri‎, 12-03-2014 08:30 AM
    analysis, dependent, nominal, regression, variable
    • Replies: 3
    • Views: 1,536
    12-05-2014, 08:38 AM Go to last post
  45. OLS with dummy and few observations (12 mean values from 2.5k observations)

    Hi all :) Maybe you can help me with a problem I have in using OLS regression: I have a dataset of 12 markets, in total ~2.5k trades happened...

    Started by callino‎, 12-04-2014 08:08 AM
    • Replies: 1
    • Views: 1,495
    12-04-2014, 09:17 AM Go to last post
  46. Simple Logistic Regression

    Hey everyone, I had a question with respect to SLR. In Block 0: my classification table predicts 89.3% In Block 1: my classification table...

    Started by natenator‎, 12-02-2014 06:28 PM
    • Replies: 2
    • Views: 1,364
    12-03-2014, 04:31 AM Go to last post
  47. Significance of constant - Mean adjusted values vs. Z scores

    Hello everyone, I am trying to run a regression analysis on 2 Inputs and their relationship with 1 Outcome variable across a number of products. I...

    Started by Londoner‎, 11-30-2014 08:39 PM
    • Replies: 5
    • Views: 1,738
    12-02-2014, 10:23 PM Go to last post
  48. Best model time series regression

    I am about to start using regression models to predict future trends. I am not sure how one choses the best of various alternative models. I assume...

    Started by noetsi‎, 12-02-2014 04:38 PM
    • Replies: 2
    • Views: 1,279
    12-02-2014, 05:44 PM Go to last post
  49. bonferroni correction in multivariate regression

    hi, I just read something that made me think about this, the p-values we calculate in a multiple regression have no adjustment for multiple test (...

    Started by rogojel‎, 11-06-2014 01:00 PM
    2 Pages
    1 2
    bonferroni, multiple regressiom, significance
    • Replies: 27
    • Views: 6,439
    12-01-2014, 06:34 PM Go to last post
  50. What type of regression to use here

    This article shows two regression models an older simpler one and a later more complex one. They never identify the type of regression used. The...

    Started by noetsi‎, 12-01-2014 03:18 PM
    • Replies: 0
    • Views: 1,238
    12-01-2014, 03:18 PM Go to last post
  51. Measurement method for DV changed during longitudinal study

    Hi All, I'm using regression analysis (multilevel linear and logistic) on a measure of children's health behaviours over 5 time-points of data. I...

    Started by Colonel‎, 11-30-2014 07:22 PM
    • Replies: 0
    • Views: 1,255
    11-30-2014, 07:22 PM Go to last post
  52. Measurement method for DV changed during longitudinal study

    Hi All, I'm performing a data analysis on a dataset I didn't do the collection for, and I am contending with some odd decisions made by the people...

    Started by Colonel‎, 11-30-2014 06:36 PM
    • Replies: 0
    • Views: 918
    11-30-2014, 06:36 PM Go to last post
  53. Bootstrap

    Hey, I am new to this forum and I have a question about Bootstrapping. I want to calculate some critical values. The data generating process is...

    Started by rantamblan‎, 11-29-2014 10:45 AM
    • Replies: 2
    • Views: 2,041
    11-30-2014, 05:45 AM Go to last post
  54. Assistance with Linear Regression Model (Model is Not Full Rank)

    Hello all, I'm currently doing a project in a computer statistics class of mine, and I have run into some potential trouble. I'll admit, I'm not...

    Started by BarnabyJones21‎, 11-29-2014 02:44 PM
    • Replies: 0
    • Views: 1,175
    11-29-2014, 02:44 PM Go to last post
  55. Hedonic regression

    What is the rationale behind hedonic quality index and how to interpret it? For any example/explanation beside the Wikipedia, I would be very...

    Started by john_f‎, 11-28-2014 03:25 PM
    multiple regression, regression
    • Replies: 0
    • Views: 1,168
    11-28-2014, 03:25 PM Go to last post
  56. Regression Analysis for comparison of crime rates across a river

    I need a bit of help refining a regression comparing crime rates of counties separated by a river. My current equation looks like: ...

    Started by acoll‎, 11-25-2014 04:43 PM
    • Replies: 1
    • Views: 1,376
    11-27-2014, 10:31 PM Go to last post
  57. Post Newbie question why we use regression ?

    Hello , Can someone explain to me why we use regression analysis , it will help us in understanding what ? , what we will gain from doing regression...

    Started by hanialbarni‎, 11-27-2014 10:00 PM
    • Replies: 2
    • Views: 970
    11-27-2014, 10:28 PM Go to last post
  58. What is the “pdm” stat in the “rms” R package?

    I am new to the world of Regression in statistics and I have been doing a research in which I am building an ordinal logistic regression model (ORM)....

    Started by danielalencar‎, 11-27-2014 07:17 PM
    measurement, orm, pdm, regression, rms
    • Replies: 0
    • Views: 3,122
    11-27-2014, 07:17 PM Go to last post
  59. Interpreting multiple regression beta values

    Basic question here but just want to double check my understanding.. When I do a multiple regression I get beta values b1=0.01 and b2=0.7 This...

    Started by jfw13‎, 11-27-2014 11:43 AM
    beta values, regression
    • Replies: 5
    • Views: 1,517
    11-27-2014, 03:33 PM Go to last post
  60. Guidance needed

    I am in healthcare and I want to predict future volume (primarily just the end of the current month). The problem I have with using a traditional...

    Started by psrs0810‎, 11-24-2014 08:03 PM
    • Replies: 2
    • Views: 1,366
    11-25-2014, 04:42 PM Go to last post

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