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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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: 2,976
    12-30-2014, 02:46 PM Go to last post
  2. 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: 914
    12-30-2014, 02:34 PM Go to last post
  3. 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: 2,303
    12-29-2014, 08:18 PM Go to last post
  4. 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: 1,402
    12-27-2014, 08:43 AM Go to last post
  5. 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: 2,127
    12-27-2014, 06:05 AM Go to last post
  6. 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: 1,491
    12-26-2014, 02:42 PM Go to last post
  7. 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: 2,029
    12-26-2014, 02:21 PM Go to last post
  8. 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: 1,542
    12-26-2014, 04:51 AM Go to last post
  9. 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: 1,858
    12-22-2014, 05:05 AM Go to last post
  10. 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: 1,397
    12-20-2014, 12:44 PM Go to last post
  11. 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: 2,395
    12-19-2014, 10:45 PM Go to last post
  12. 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: 5,461
    12-19-2014, 04:27 PM Go to last post
  13. 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: 1,576
    12-19-2014, 01:35 PM Go to last post
  14. 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: 2,043
    12-18-2014, 02:17 PM Go to last post
  15. 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: 1,382
    12-18-2014, 11:40 AM Go to last post
  16. 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: 1,056
    12-18-2014, 10:59 AM Go to last post
  17. 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: 3,479
    12-18-2014, 10:19 AM Go to last post
  18. 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: 1,137
    12-16-2014, 01:00 PM Go to last post
  19. 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: 1,232
    12-16-2014, 11:18 AM Go to last post
  20. 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: 1,448
    12-16-2014, 02:39 AM Go to last post
  21. 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: 4,701
    12-15-2014, 06:41 PM Go to last post
  22. 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: 2,065
    12-15-2014, 05:56 PM Go to last post
  23. what is correlation???!!!!

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

    Started by haraharae‎, 09-12-2014 12:45 PM
    • Replies: 4
    • Views: 1,583
    12-14-2014, 11:56 AM Go to last post
  24. 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: 2,738
    12-12-2014, 12:08 PM Go to last post
  25. 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: 1,194
    12-10-2014, 10:54 PM Go to last post
  26. 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: 1,019
    12-10-2014, 02:21 PM Go to last post
  27. 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: 935
    12-10-2014, 12:01 AM Go to last post
  28. 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: 1,869
    12-09-2014, 03:14 PM Go to last post
  29. 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: 3,281
    12-08-2014, 06:40 PM Go to last post
  30. 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: 1,358
    12-08-2014, 02:54 AM Go to last post
  31. 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: 997
    12-07-2014, 06:49 AM Go to last post
  32. 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: 1,123
    12-05-2014, 09:48 AM Go to last post
  33. 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: 1,410
    12-05-2014, 08:38 AM Go to last post
  34. 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: 1,394
    12-04-2014, 09:17 AM Go to last post
  35. 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: 1,236
    12-03-2014, 04:31 AM Go to last post
  36. 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: 1,651
    12-02-2014, 10:23 PM Go to last post
  37. 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: 1,055
    12-02-2014, 05:44 PM Go to last post
  38. 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: 6,063
    12-01-2014, 06:34 PM Go to last post
  39. 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: 1,144
    12-01-2014, 03:18 PM Go to last post
  40. 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: 1,139
    11-30-2014, 07:22 PM Go to last post
  41. 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: 841
    11-30-2014, 06:36 PM Go to last post
  42. 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: 1,887
    11-30-2014, 05:45 AM Go to last post
  43. 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: 1,100
    11-29-2014, 02:44 PM Go to last post
  44. 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: 1,084
    11-28-2014, 03:25 PM Go to last post
  45. 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: 1,287
    11-27-2014, 10:31 PM Go to last post
  46. 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: 919
    11-27-2014, 10:28 PM Go to last post
  47. 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: 2,896
    11-27-2014, 07:17 PM Go to last post
  48. 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: 1,399
    11-27-2014, 03:33 PM Go to last post
  49. 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: 1,287
    11-25-2014, 04:42 PM Go to last post
  50. Panel Data: Add Fixed Effects Before or After Controls?

    Hi all, I'm using 51 entities with seven independent variables. Is it typically better to add entity/time fixed effects at the beginning or at the...

    Started by GWStudent‎, 11-25-2014 12:27 AM
    panel data
    • Replies: 0
    • Views: 1,274
    11-25-2014, 12:27 AM Go to last post
  51. Smile Running multple, multiple regressions? which statistical test should i use?

    I have done a study on whether personality and demographics predict interaction on facebook brand pages. I have used a Big five personality scale...

    Started by arnika‎, 11-21-2014 09:22 AM
    correlation, regression, spss
    • Replies: 5
    • Views: 1,982
    11-22-2014, 08:18 AM Go to last post
  52. Regression analysis with independant variable (error) and multiple dependant variable

    So I took a lot of data (~10000) on a machine (3D printer). For each reading, I got the error and a lot of different parameter (speed, voltage,...

    Started by Elok‎, 11-18-2014 01:25 PM
    2 Pages
    1 2
    linearity, regression analysis
    • Replies: 26
    • Views: 6,144
    11-21-2014, 08:24 AM Go to last post
  53. Analyse a variable as continuous and as categorical

    Hello everybody I performed a univariate analysis of a set of predictors. My plan was to include the significant predictors in a multivariate cox...

    Started by noob‎, 11-20-2014 04:01 PM
    • Replies: 3
    • Views: 1,761
    11-21-2014, 08:14 AM Go to last post
  54. Double Regression?

    I am looking at two years of financial info by month. I need to project out next month - however, at the end of our one fiscal year there was a...

    Started by psrs0810‎, 11-20-2014 10:11 AM
    • Replies: 1
    • Views: 980
    11-20-2014, 03:08 PM Go to last post
  55. Mathematical calculation in Access

    I have a math problem and I want to ask me pomognete.I working on complex desktop database.My main point is making the application for the simulation...

    Started by j235‎, 11-18-2014 04:38 PM
    • Replies: 1
    • Views: 1,181
    11-18-2014, 05:16 PM Go to last post
  56. SVAR parameter standard errors

    Hi everyone, How to calculate the standard errors of SVAR parameters. I know how to estimate it for contemporaneous parameter. I want to know how...

    Started by cjiang3‎, 11-17-2014 12:55 PM
    svar, var
    • Replies: 2
    • Views: 2,775
    11-18-2014, 09:27 AM Go to last post
  57. REGRESSION are these real findings or outcomes of preexisting differences?

    Hi guys, I have a N=138 sample that consists of 56 participants form one country and 82 from another country. When i run a stepwise regressions...

    Started by coffeehipster‎, 11-15-2014 07:55 PM
    • Replies: 2
    • Views: 1,429
    11-17-2014, 07:27 PM Go to last post
  58. Dummy variables (and poster!)

    Hi, Could someone please help me understand dummy variables? If I had a variable which was “Religion” that was coded: 1 = Catholic 2 =...

    Started by Kenny‎, 11-16-2014 12:42 PM
    • Replies: 1
    • Views: 1,133
    11-16-2014, 03:52 PM Go to last post
  59. Interaction/Moderation Question

    So I know that the terms interaction and moderation are used pretty much interchangeably. However, is it possible for variables to interact without...

    Started by RER31‎, 11-14-2014 09:36 PM
    • Replies: 4
    • Views: 1,798
    11-16-2014, 08:42 AM Go to last post
  60. Reporting results of non-linear regression with centered variables

    Hi I have a regression y = a + b1(x) + b2(x^2) + ...bn + e when i run the regression b1 and b2 are significant (and of opposite sign) but...

    Started by steve1‎, 11-04-2014 11:55 AM
    • Replies: 3
    • Views: 3,215
    11-14-2014, 11:12 AM Go to last post

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