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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. How to check if vector is close to space spanned by 2 basis vectors (lin. regression)

    Here is the situation: I have measured gene expression data for cells that have been subjected to three different stimuli. This means I have 3 long...

    Started by Rubber‎, 02-04-2015 09:48 AM
    gene expression, linear regression
    • Replies: 0
    • Views: 394
    02-04-2015, 09:48 AM Go to last post
  2. Use of scale () function and conflicting standardized values for fixed effects

    Hi, I'm currently using the scale() function in a glmer model (see below) and I'm having some inconsistencies between my standardized coefficient...

    Started by arl139‎, 02-04-2015 07:12 AM
    • Replies: 0
    • Views: 640
    02-04-2015, 07:12 AM Go to last post
  3. Addressing Heteroskedasticity: OLS (robust), OLS [aweight], VWLS (w/omega)

    Hello dear forum member, Your recent help with my model specification has been invaluable. I also followed your advise on reading the book by...

    Started by kiton‎, 01-31-2015 03:04 PM
    • Replies: 8
    • Views: 1,038
    02-03-2015, 12:16 PM Go to last post
  4. Interpreting the coefficients of my regression model

    Hi all, I am a student at Bournemouth University currently undertaking a research project into the pay-performance sensitivity in AIM companies. I...

    Started by george1660‎, 02-01-2015 04:05 AM
    • Replies: 6
    • Views: 1,061
    02-02-2015, 10:08 AM Go to last post
  5. Logit regression interaction/moderation: what to do about it?

    Hi all! I have a multivariable logit regression model that has two terms showing two-way interaction (the interaction also makes biological...

    Started by Johann Kotze‎, 01-31-2015 04:10 AM
    interaction variables, logistic regression, moderation
    • Replies: 3
    • Views: 787
    01-31-2015, 10:24 PM Go to last post
  6. Linear and Non-Linear three parameter Regression Analysis questions.

    Hello All A short warning for a very long post! Im currently working on my master thesis in mechanical engineering. I need to do, for me, an...

    Started by kbach‎, 01-31-2015 08:19 AM
    • Replies: 0
    • Views: 578
    01-31-2015, 08:19 AM Go to last post
  7. Meta Analysis with Several Regression Studies

    Hi folks, this is my first post. I'm encountering a class of problems that I do not know how to solve. If anyone out there can give me any book...

    Started by Tom Mattson‎, 01-28-2015 03:20 PM
    • Replies: 0
    • Views: 568
    01-28-2015, 03:20 PM Go to last post
  8. Regression help needed

    Hi members, Is there anyone who would be willing to give me 5 hours during the day sometime of some regression / modelling help. Im happy to pay...

    Started by bobastic‎, 01-28-2015 06:03 AM
    • Replies: 0
    • Views: 572
    01-28-2015, 06:03 AM Go to last post
  9. re: basic question on why my predictor is not significant?

    I am puzzle by why my predictor was not significant so I would like to seek your expertise. My regression model does not provide significant on the...

    Started by minhdung‎, 01-27-2015 02:43 PM
    • Replies: 3
    • Views: 730
    01-27-2015, 11:04 PM Go to last post
  10. Unobserved heterogenity

    This is a signficant problem potentially for Cox and logistic regression. I have never found a test for whether it exists. I doubt there is one, but...

    Started by noetsi‎, 01-26-2015 01:28 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 1,953
    01-27-2015, 01:01 PM Go to last post
  11. How do you find the average correlation of a variable that changes over time?

    I'm looking at a data set of movies with the number of mentions on Twitter over time and trying to find if there's a linear correlation with box...

    Started by sosaysi‎, 01-26-2015 04:50 PM
    • Replies: 2
    • Views: 660
    01-27-2015, 10:13 AM Go to last post
  12. Doing correct backwards elimination with interaction terms?

    I'm wondering about this, and I can't find an answer anywhere. My textbook (Agresti and Finlay 2009) clearly says how to do backwards elimination on...

    Started by Lukan27‎, 01-26-2015 11:49 AM
    2 Pages
    1 2
    backwards, correct, elimination, interaction, term
    • Replies: 15
    • Views: 2,873
    01-27-2015, 09:27 AM Go to last post
  13. DV is a RANK with highest 1 and lowest 899 - what is the proper estimation method?

    Hello dear forum members! I want to do a robustness check of the estimates that I have obtained previously using OLS estimation. In that case the...

    Started by kiton‎, 01-25-2015 06:23 PM
    • Replies: 11
    • Views: 1,247
    01-26-2015, 03:19 PM Go to last post
  14. cox regression

    This is interested in surival time to an event and deals with time series data inherently, including the use of lagging indicators in some cases....

    Started by noetsi‎, 01-20-2015 10:56 AM
    • Replies: 1
    • Views: 552
    01-25-2015, 02:01 PM Go to last post
  15. 1 out of 5 predictors is non-linear - can I proceed with OLS estimation?

    Hello dear forum members! My univariate multiple regression model includes 5 predictors + 2 interaction terms. However, examination of the fitted...

    Started by kiton‎, 01-22-2015 11:36 AM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 3,024
    01-24-2015, 12:58 AM Go to last post
  16. Binary Logistic Regression and Generalised Linear Model

    I have basic understanding of statistics and am trying to interpret the output of a generalised linear model. The data used in my analyses...

    Started by jle‎, 01-21-2015 10:54 PM
    • Replies: 4
    • Views: 802
    01-22-2015, 08:43 PM Go to last post
  17. mixed effect models in R using glmer

    Folks, I'm looking for a very basic introduction to mixed effect models in a health care context. Suggestions welcome. Thanks

    Started by tdetz‎, 01-20-2015 08:34 PM
    • Replies: 5
    • Views: 938
    01-21-2015, 06:42 PM Go to last post
  18. Anyone familiar with this statistical paradox?

    I have discovered an interesting statistical paradox. If you familiar with it, please, let me know about its conventional name (or author's name) and...

    Started by Alex777777‎, 01-20-2015 03:25 AM
    • Replies: 0
    • Views: 645
    01-20-2015, 03:25 AM Go to last post
  19. Cool U-shaped relationship by quadratic variable. Interpreting effect size.

    First post, eager to learn. I am trying to interpret a study that tests, among other relationships, if there is a U-shaped relationship between x...

    Started by rj.ter.haar‎, 01-18-2015 05:08 PM
    • Replies: 0
    • Views: 806
    01-18-2015, 05:08 PM Go to last post
  20. Help on interpreting linear regression

    I'm currently working on a larger assignment, and I need some input how to interpret the results from my/a linear regression. I'm pretty sure I get...

    Started by Lukan27‎, 01-18-2015 07:07 AM
    estimate, interpret, linear, model
    • Replies: 1
    • Views: 753
    01-18-2015, 08:56 AM Go to last post
  21. Question What type of regression I need to use?

    :confused: I am doing a medical research in which I am going to compare two methods of calculation of RBC life span. The older method is a...

    Started by Shahriar‎, 01-16-2015 01:05 PM
    clinical study
    • Replies: 1
    • Views: 646
    01-16-2015, 01:23 PM Go to last post
  22. Probit regression with misclassified binary dependent variable in R

    Is there a generalized linear mixed-effects model implementation for R that could handle misclassified binary data? Unless I have overlooked...

    Started by jackmendoza‎, 01-16-2015 08:35 AM
    • Replies: 0
    • Views: 719
    01-16-2015, 08:35 AM Go to last post
  23. Simple Linear Regression - Many Data Sets

    We have to predict a future value for one variable based solely on past instances of that variable. This has to be done for many different data...

    Started by Firewoofie‎, 01-15-2015 01:50 PM
    linear regression, many data sets, one variable regression
    • Replies: 0
    • Views: 579
    01-15-2015, 01:50 PM Go to last post
  24. Finding a patch in a series.

    Hello! I wonder if anybody can help me. I am working on a personal project and I want to find the best match for a patch in a larger series. I...

    Started by yaraeovento‎, 01-15-2015 12:11 AM
    cross correlation, matching data
    • Replies: 0
    • Views: 548
    01-15-2015, 12:11 AM Go to last post
  25. Do I need to control for Type 1 errors?

    Hi guys, the situation I have is, a reviewer has asked me to reduce my mediation model (MPLUS) as he says I have too many tests going on. In fairness...

    Started by DrFurbs‎, 01-10-2015 01:31 PM
    • Replies: 5
    • Views: 1,361
    01-14-2015, 02:09 PM Go to last post
  26. Regression: cor(X1, Yhat) = cor(X1, Y)/R How to show?

    Hello everyone. I am taking a class in regression that's way over my head. We are working with the sample model Y = b0 + b1X1 + b2X2 + e. In it I am...

    Started by will22‎, 01-13-2015 03:58 PM
    • Replies: 3
    • Views: 1,162
    01-14-2015, 01:02 AM Go to last post
  27. Comparing different, related measures of the same thing to see which is most sig?

    I want to start out saying my stat knowledge is weak. I am writing my Masters thesis and I'm struggling to understand how to get the answers I want....

    Started by OkieSpladle‎, 01-10-2015 03:38 PM
    • Replies: 1
    • Views: 626
    01-11-2015, 01:17 AM Go to last post
  28. SE MultiLevel Models

    Not accounting for dependence in observations and not using the appropriate cross-sectional multilevel model results in parameter estimate's standard...

    Started by hlsmith‎, 01-10-2015 09:56 AM
    biased standard error
    • Replies: 1
    • Views: 663
    01-10-2015, 08:46 PM Go to last post
  29. Unbalanced panel dataset

    I need some clarification on how unbalanced panel data should be organized. For instance, suppose you have sample of total N products' prices and...

    Started by john_f‎, 01-10-2015 06:25 PM
    • Replies: 0
    • Views: 554
    01-10-2015, 06:25 PM Go to last post
  30. Data problem

    I need a little help about a guidance how to represent "unlimited" as a value in regression variable. For example, some phone plans includes...

    Started by john_f‎, 01-09-2015 04:36 PM
    • Replies: 2
    • Views: 636
    01-09-2015, 06:34 PM Go to last post
  31. 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 10:22 PM
    • Replies: 4
    • Views: 941
    01-07-2015, 05:39 PM Go to last post
  32. 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 09:50 AM
    • Replies: 3
    • Views: 664
    01-07-2015, 03:36 PM Go to last post
  33. 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 12:16 PM
    • Replies: 0
    • Views: 597
    01-07-2015, 12:16 PM Go to last post
  34. (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 06:32 PM
    • Replies: 6
    • Views: 1,427
    01-06-2015, 05:49 AM Go to last post
  35. 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 04:55 PM
    • Replies: 10
    • Views: 1,731
    01-05-2015, 08:37 PM Go to last post
  36. 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: 9,483
    01-05-2015, 12:34 PM Go to last post
  37. 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 10:20 AM
    • Replies: 2
    • Views: 1,243
    01-05-2015, 12:20 PM Go to last post
  38. 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 05:58 PM
    • Replies: 6
    • Views: 1,023
    01-03-2015, 07:13 AM Go to last post
  39. 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 02:37 PM
    • Replies: 9
    • Views: 1,363
    01-03-2015, 05:52 AM Go to last post
  40. How to find: Best fit regression Model

    Thank you so much in advance!

    Started by Niklas1392‎, 01-03-2015 05:21 AM
    best fit, linear regression, regression analysis
    • Replies: 0
    • Views: 530
    01-03-2015, 05:21 AM Go to last post
  41. 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 09:09 AM
    • Replies: 7
    • Views: 1,318
    12-30-2014, 09:16 PM Go to last post
  42. 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 12:32 PM
    • Replies: 12
    • Views: 1,166
    12-30-2014, 01:46 PM Go to last post
  43. 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 08:40 AM
    • Replies: 4
    • Views: 648
    12-30-2014, 01:34 PM Go to last post
  44. 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 02:30 PM
    • Replies: 5
    • Views: 1,172
    12-29-2014, 07:18 PM Go to last post
  45. 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 07:30 AM
    logit validation
    • Replies: 1
    • Views: 727
    12-27-2014, 07:43 AM Go to last post
  46. 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 12:41 AM
    data, non-linear, options, patient, regression
    • Replies: 6
    • Views: 1,353
    12-27-2014, 05:05 AM Go to last post
  47. 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 06:52 AM
    complete separation, logistic regression, spss
    • Replies: 1
    • Views: 807
    12-26-2014, 01:42 PM Go to last post
  48. 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 02:18 PM
    • Replies: 6
    • Views: 1,297
    12-26-2014, 01:21 PM Go to last post
  49. 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 09:05 AM
    compensation, controls, matching, patients, regression
    • Replies: 5
    • Views: 1,020
    12-26-2014, 03:51 AM Go to last post
  50. 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 03:40 PM
    endogenous, regression, variable
    • Replies: 3
    • Views: 967
    12-22-2014, 04:05 AM Go to last post
  51. 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 11:44 AM
    fixed effects model, logistic regression, multicollinearity, regression, regression assumption
    • Replies: 0
    • Views: 846
    12-20-2014, 11:44 AM Go to last post
  52. 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 07:26 PM
    • Replies: 3
    • Views: 890
    12-19-2014, 09:45 PM Go to last post
  53. 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 02:53 PM
    • Replies: 7
    • Views: 2,769
    12-19-2014, 03:27 PM Go to last post
  54. 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 12:35 PM
    logistic regression, logit, multilevel analysis, multilevel model, multilevel modeling
    • Replies: 0
    • Views: 626
    12-19-2014, 12:35 PM Go to last post
  55. 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 09:45 AM
    likert scale, multiple regression, ordinal logistic reg, regression analysis
    • Replies: 3
    • Views: 984
    12-18-2014, 01:17 PM Go to last post
  56. 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 10:31 AM
    goodness of fit, mnl, mnl model
    • Replies: 1
    • Views: 699
    12-18-2014, 10:40 AM Go to last post
  57. 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 09:59 AM
    • Replies: 0
    • Views: 540
    12-18-2014, 09:59 AM Go to last post
  58. 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: 1,715
    12-18-2014, 09:19 AM Go to last post
  59. 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 12:00 PM
    • Replies: 0
    • Views: 687
    12-16-2014, 12:00 PM Go to last post
  60. 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 08:47 AM
    • Replies: 3
    • Views: 693
    12-16-2014, 10:18 AM Go to last post

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