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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Interpretation of linear-log regression model (Neep Help)

    Dear All, I had a problem with my data of growth in percentage regarding negative and positive values due to which I could not transform it into...

    Started by b1lal‎, 02-09-2015 06:57 AM
    interpretation, log-linear, regression analysis
    • Replies: 2
    • Views: 884
    02-09-2015, 01:46 PM Go to last post
  2. Help with PCA-Loading Interpretation

    Hey People Im currently learning to use multivariate analysis in my PhD project, and have an Abstract deadline and a Statistician on holiday so I...

    Started by Taraaa‎, 02-09-2015 08:06 AM
    • Replies: 0
    • Views: 735
    02-09-2015, 08:06 AM Go to last post
  3. Writing R^2 strictly in terms of simple correlations among variables

    Say we have the following regression Y_i=\beta_0+\beta_1X_{1i}+\beta_2X_{2i}+\epsilon_i I want to write the multiple R^2 for this regression...

    Started by Jake‎, 10-17-2014 03:45 PM
    • Replies: 8
    • Views: 2,381
    02-07-2015, 07:06 PM Go to last post
  4. Transforming skewed data without decreasing kurtosis

    Have a data set with negative kurtosis and skewness values. Have tried numerous transformations but cannot find a solution that generates acceptable...

    Started by DrJames‎, 02-06-2015 03:09 PM
    • Replies: 4
    • Views: 1,311
    02-07-2015, 12:52 PM Go to last post
  5. Validity of the regression equation.

    Along with this post, I have attached a screenshot of my assignment and I am confused about the validity of regressions equations. I plotted linear...

    Started by Tansai‎, 02-06-2015 12:04 PM
    • Replies: 1
    • Views: 835
    02-06-2015, 01:10 PM Go to last post
  6. Ambulance utilisation: help choosing a method

    Hi, I need some advice in selecting a statistical test please. I am researching ambulance utilisation rates at a population level (defined by a...

    Started by john_martin‎, 02-04-2015 05:16 PM
    • Replies: 8
    • Views: 1,292
    02-06-2015, 04:57 AM Go to last post
  7. Must categorical variables always be dummy coded in linear regression?

    My question is must we always dummy code categorical variables in linear regression. What if I wanted to understand the overall effect of a...

    Started by dce219‎, 02-05-2015 11:05 PM
    • Replies: 2
    • Views: 1,002
    02-06-2015, 04:43 AM Go to last post
  8. Regression Model is not full rank

    Hi all, I am trying to detect relationship of crop yield at the end of the growing seasson (1 dependent variable) using amount of precipitation in...

    Started by szm‎, 11-19-2012 12:18 PM
    full rank, multicollinearity, p-value, problem, regression
    • Replies: 3
    • Views: 9,263
    02-06-2015, 03:08 AM Go to last post
  9. Fixed term is (Intercept) --Dredge function

    Hi, i'm currently running a glm model in R and have attempted to use the following code: Model:...

    Started by arl139‎, 02-05-2015 09:52 PM
    dredge, glm, logistic regression
    • Replies: 2
    • Views: 4,365
    02-05-2015, 11:08 PM Go to last post
  10. Which Blood Pressure Tool better predicts kidney function: help choosing test.

    Hi there, I am trying to see whether there is an advantage of using one blood pressure tool over another at predicting kidney function. Both...

    Started by Robspierre‎, 02-05-2015 06:19 PM
    • Replies: 1
    • Views: 646
    02-05-2015, 10:12 PM Go to last post
  11. Regression Analysis: Heteroskedasticity

    Hello I am a student studying econometrics and at the moment we are studying about heteroskedasticty and autocorrelation. I have been analysing...

    Started by mattonline‎, 02-05-2015 04:14 PM
    • Replies: 0
    • Views: 610
    02-05-2015, 04:14 PM Go to last post
  12. Strategies for managing multicollinearity in hierarchical regression

    Strategies for managing multicollinearity in hierarchical regression Hi, I am doing a thesis project that involves using hierarchical multiple...

    Started by TeenyZ‎, 02-04-2015 07:13 PM
    • Replies: 0
    • Views: 430
    02-04-2015, 07:13 PM Go to last post
  13. range of possible values for regression coefficients given another one?

    i feel like the answer to my question is a 'no' but i'll ask it anyway just to be absolutely sure. say you have 3 variables X, Y and Z each one...

    Started by spunky‎, 01-28-2015 01:36 PM
    regresion, restriction
    • Replies: 3
    • Views: 951
    02-04-2015, 04:11 PM Go to last post
  14. 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 10:48 AM
    gene expression, linear regression
    • Replies: 0
    • Views: 538
    02-04-2015, 10:48 AM Go to last post
  15. 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 08:12 AM
    • Replies: 0
    • Views: 1,037
    02-04-2015, 08:12 AM Go to last post
  16. 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 04:04 PM
    • Replies: 8
    • Views: 1,151
    02-03-2015, 01:16 PM Go to last post
  17. 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 05:05 AM
    • Replies: 6
    • Views: 1,341
    02-02-2015, 11:08 AM Go to last post
  18. 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 05:10 AM
    interaction variables, logistic regression, moderation
    • Replies: 3
    • Views: 975
    01-31-2015, 11:24 PM Go to last post
  19. 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 09:19 AM
    • Replies: 0
    • Views: 746
    01-31-2015, 09:19 AM Go to last post
  20. 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 04:20 PM
    • Replies: 0
    • Views: 762
    01-28-2015, 04:20 PM Go to last post
  21. 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 07:03 AM
    • Replies: 0
    • Views: 764
    01-28-2015, 07:03 AM Go to last post
  22. 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 03:43 PM
    regression
    • Replies: 3
    • Views: 899
    01-28-2015, 12:04 AM Go to last post
  23. 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 02:28 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 2,476
    01-27-2015, 02:01 PM Go to last post
  24. 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 05:50 PM
    • Replies: 2
    • Views: 855
    01-27-2015, 11:13 AM Go to last post
  25. 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 12:49 PM
    2 Pages
    1 2
    backwards, correct, elimination, interaction, term
    • Replies: 15
    • Views: 4,350
    01-27-2015, 10:27 AM Go to last post
  26. 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 07:23 PM
    • Replies: 11
    • Views: 1,441
    01-26-2015, 04:19 PM Go to last post
  27. 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 11:56 AM
    autocorrelation
    • Replies: 1
    • Views: 682
    01-25-2015, 03:01 PM Go to last post
  28. 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 12:36 PM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 3,751
    01-24-2015, 01:58 AM Go to last post
  29. 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 11:54 PM
    • Replies: 4
    • Views: 944
    01-22-2015, 09:43 PM Go to last post
  30. 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 09:34 PM
    • Replies: 5
    • Views: 1,102
    01-21-2015, 07:42 PM Go to last post
  31. 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 04:25 AM
    • Replies: 0
    • Views: 834
    01-20-2015, 04:25 AM Go to last post
  32. 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 06:08 PM
    • Replies: 0
    • Views: 1,076
    01-18-2015, 06:08 PM Go to last post
  33. 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 08:07 AM
    estimate, interpret, linear, model
    • Replies: 1
    • Views: 1,065
    01-18-2015, 09:56 AM Go to last post
  34. 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 02:05 PM
    clinical study
    • Replies: 1
    • Views: 822
    01-16-2015, 02:23 PM Go to last post
  35. 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 09:35 AM
    • Replies: 0
    • Views: 856
    01-16-2015, 09:35 AM Go to last post
  36. 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 02:50 PM
    linear regression, many data sets, one variable regression
    • Replies: 0
    • Views: 683
    01-15-2015, 02:50 PM Go to last post
  37. 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 01:11 AM
    cross correlation, matching data
    • Replies: 0
    • Views: 653
    01-15-2015, 01:11 AM Go to last post
  38. 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 02:31 PM
    • Replies: 5
    • Views: 1,577
    01-14-2015, 03:09 PM Go to last post
  39. 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 04:58 PM
    • Replies: 3
    • Views: 1,616
    01-14-2015, 02:02 AM Go to last post
  40. 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 04:38 PM
    • Replies: 1
    • Views: 749
    01-11-2015, 02:17 AM Go to last post
  41. 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 10:56 AM
    biased standard error
    • Replies: 1
    • Views: 748
    01-10-2015, 09:46 PM Go to last post
  42. 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 07:25 PM
    dataset
    • Replies: 0
    • Views: 667
    01-10-2015, 07:25 PM Go to last post
  43. 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 05:36 PM
    regresion
    • Replies: 2
    • Views: 838
    01-09-2015, 07:34 PM Go to last post
  44. 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: 1,259
    01-07-2015, 06:39 PM Go to last post
  45. 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: 785
    01-07-2015, 04:36 PM Go to last post
  46. 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: 719
    01-07-2015, 01:16 PM Go to last post
  47. (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: 1,982
    01-06-2015, 06:49 AM Go to last post
  48. 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: 2,256
    01-05-2015, 09:37 PM Go to last post
  49. 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: 11,364
    01-05-2015, 01:34 PM Go to last post
  50. 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: 1,801
    01-05-2015, 01:20 PM Go to last post
  51. 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: 1,288
    01-03-2015, 08:13 AM Go to last post
  52. 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: 1,851
    01-03-2015, 06:52 AM Go to last post
  53. 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: 736
    01-03-2015, 06:21 AM Go to last post
  54. 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: 2,175
    12-30-2014, 10:16 PM Go to last post
  55. 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: 1,796
    12-30-2014, 02:46 PM Go to last post
  56. 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: 712
    12-30-2014, 02:34 PM Go to last post
  57. 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: 1,493
    12-29-2014, 08:18 PM Go to last post
  58. 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: 866
    12-27-2014, 08:43 AM Go to last post
  59. 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: 1,564
    12-27-2014, 06:05 AM Go to last post
  60. 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: 924
    12-26-2014, 02:42 PM Go to last post

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