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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Multivariate linear regression analysis (multiple dependent variable, one independent

    I am trying to determine the reason why(and how many) people with health insurance do not fully use all of its benefits(like free flu vaccines). I am...

    Started by p_s‎, 08-03-2014 11:18 PM
    6 Pages
    1 2 3 ... 6
    • Replies: 75
    • Views: 19,435
    09-21-2014, 06:00 AM Go to last post
  2. Logistic regression

    As far as I know logistic regression does not have beta weights, that is slopes which show which variable has the relatively greatest impact on the...

    Started by noetsi‎, 01-23-2013 01:14 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 55
    • Views: 9,983
    04-10-2013, 10:12 AM Go to last post
  3. Multivariate normality

    I know various methods of determing if the bivariate relationship of two variables are normal. But, as Dason has drilled into me, its multivariate...

    Started by noetsi‎, 06-21-2013 04:16 PM
    4 Pages
    1 2 3 ... 4
    multivariate normality, outliers
    • Replies: 50
    • Views: 11,062
    09-02-2013, 10:04 PM Go to last post
  4. Assumptions of logistic regression

    Anyone know a good authoritative source for the assumptions of logistic regression? They differ obviously from OLS and I have not found a good source...

    Started by noetsi‎, 11-22-2011 01:43 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 47
    • Views: 84,297
    11-29-2011, 07:40 PM Go to last post
  5. Understanding Multilevel Model

    I'm slowly working through multilevel models and have a pretty specific question/though checking. Here's some R code: library(lme4);...

    Started by trinker‎, 02-17-2014 11:18 PM
    4 Pages
    1 2 3 ... 4
    multilevel model
    • Replies: 47
    • Views: 10,087
    02-23-2014, 11:48 PM Go to last post
  6. Linear regression with non-normal data?

    It is my understanding that for linear regression both data sets must be normally distributed. One of my two sets of data (x) is normally...

    Started by GrungyGoose‎, 11-13-2011 11:23 AM
    3 Pages
    1 2 3
    normality, regression
    • Replies: 43
    • Views: 81,219
    07-15-2013, 10:15 PM Go to last post
  7. Post [R] Between subjects repeated measures ANOVA help. Level: Novice.

    Dear community, I am fairly new to the field of statistics and R and I apologise if my problem seems to be too basic. In my research I have...

    Started by pickle‎, 02-17-2013 09:25 AM
    3 Pages
    1 2 3
    • Replies: 40
    • Views: 9,700
    03-02-2013, 09:23 PM Go to last post
  8. heteroskedasticity and non normal residuals in linear regression - please help!

    Dear All I'm struggling with a linear model. My dependent variable is change in central anterior chamber depth of the eye with time. ...

    Started by SiBorg‎, 09-26-2012 01:23 PM
    3 Pages
    1 2 3
    • Replies: 35
    • Views: 9,396
    10-21-2012, 11:36 AM Go to last post
  9. Comparing coefficients from two separate regressions

    I have done my best to do an extensive literature review to answer this question, but I've frustratingly found nothing. So I would appreciate any...

    Started by dlh8‎, 02-09-2014 08:35 PM
    3 Pages
    1 2 3
    • Replies: 33
    • Views: 6,672
    02-18-2014, 03:01 PM Go to last post
  10. 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: 14,339
    02-15-2012, 12:22 AM Go to last post
  11. 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: 6,194
    01-24-2015, 01:58 AM Go to last post
  12. Regression questions

    Hey everybody. I want to start out by saying Thank You for taking the time to look at my thread. I have completed my Stats course and now I am on to...

    Started by USMstudent85‎, 10-12-2011 11:13 AM
    2 Pages
    1 2
    • Replies: 28
    • Views: 7,105
    10-18-2011, 10:31 AM Go to last post
  13. Dealing with violations of the assumptions.

    I thought I had this covered in detail, but if so I apparently lost it. When you discover you have non-normal residuals the first suggestion is...

    Started by noetsi‎, 04-21-2015 03:51 PM
    2 Pages
    1 2
    • Replies: 28
    • Views: 5,488
    04-28-2015, 07:47 AM Go to last post
  14. Question Vote Fraud in Iowa??? Tell me how this is statistically possible please!

    NOTE: UPDATED, PLEASE SEE MY COMMENT #26 ON PAGE TWO. Ok... Please be easy on me... One, I'm new here. Two, it has been a long time...

    Started by presence‎, 02-21-2012 10:10 PM
    2 Pages
    1 2
    • Replies: 27
    • Views: 6,405
    10-08-2012, 01:53 PM Go to last post
  15. 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: 6,841
    12-01-2014, 06:34 PM Go to last post
  16. 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: 7,018
    11-21-2014, 08:24 AM Go to last post
  17. Hosmer and Lemeshow Test is significant

    Hi all, can anyone tell me if one can still use a model which reports a H&L test with significant chi-square? (I have a very large sample - + 100...

    Started by PedroR‎, 05-14-2013 06:19 PM
    2 Pages
    1 2
    • Replies: 25
    • Views: 21,092
    05-16-2013, 09:49 AM Go to last post
  18. Binary Logistic Regression in R

    Warning: this is going to be a long post. Acknowledgement: Thanks to The Ecologist for getting me started on what I hope is the right road. This...

    Started by jerh‎, 12-04-2008 11:10 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 23,729
    12-16-2008, 03:21 AM Go to last post
  19. how to prove COV(y bar, estimated beta1) in linear regression equals 0

    Yi=Xi*beta1 + beta0 + error Prove: COV(average of Yi, estimated beta1) = 0 Thanks!

    Started by hehe1223‎, 06-27-2010 07:30 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 44,049
    09-10-2015, 12:27 AM Go to last post
  20. Link function for proportional outcome

    I have a data set where the outcome variable is percent passing (ELA and Math tests) for school districts. I will use a 2 level multilevel model...

    Started by trinker‎, 04-18-2014 12:09 PM
    2 Pages
    1 2
    distribution, link, multilevel
    • Replies: 24
    • Views: 5,103
    05-06-2014, 06:39 PM Go to last post
  21. Question Graphically check linearity in logit regression

    Hi all, I am running a logit regression where the outcome variable is binary. I am interested in checking, graphically, whether the relationship...

    Started by Phaedrus‎, 07-21-2014 07:50 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 18,459
    04-19-2016, 10:59 AM Go to last post
  22. What is the difference between an interaction effect and a moderator in regression?

    I hear these two concepts a lot in the literature. I have no idea what the difference is between a moderator and an interaction term. While I am...

    Started by noetsi‎, 01-28-2016 01:56 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 4,080
    02-24-2016, 03:02 PM Go to last post
  23. Postive correlation but negative coefficient in regression??

    Im a little confused by some results I have..... I have two predictor variables and an outcome variable. The first predictor is positively...

    Started by statto‎, 08-20-2011 09:39 AM
    2 Pages
    1 2
    rho/beta conflict, suppression
    • Replies: 23
    • Views: 57,444
    10-07-2016, 04:31 AM Go to last post
  24. Standard or Hierarchical Regression?

    I would like to predict creativity (DV) through involvement (IV), after controlling for team size and gender. Questions 1) Do I use hierarchical...

    Started by funnyman‎, 03-16-2015 11:40 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 6,246
    04-22-2015, 03:06 AM Go to last post
  25. ANOVA with multiple imputed Data

    Hello :) I used multiple imputation on my data to get a complete data set. I want to do a ANOVA now. Does anybody know how to do that correctly? ...

    Started by froop91‎, 09-06-2017 04:37 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 1,287
    09-15-2017, 04:15 AM Go to last post
  26. Hypotheses testing if R=1

    Dear all, Since the R value of my regression model is one, I can neither conduct a t-test nor a F-test. Is this a problem with regard to...

    Started by yosi‎, 04-09-2014 06:12 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 25,923
    04-11-2014, 02:30 PM Go to last post
  27. Need help with regression statistics analysis

    Hello I need serious help. I did my last project fine. I've followed all my instructions for this final project, and did everything, but the part to...

    Started by HeavenSoldier‎, 04-04-2006 01:46 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 7,721
    04-19-2006, 10:20 PM Go to last post
  28. What test if no linearity

    Dear forum members, I am currently struggling with my research about boardmembers and their influence on the strategy. From other articles I...

    Started by Jdijkers‎, 11-18-2013 10:14 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 3,506
    11-18-2013, 04:15 PM Go to last post
  29. Hypothesis

    If you got this model: mode 1) y=a +b1x1 + b2x2 + u and this: mode 2) y=a + b1(x1-x2) + u What do you call the restriction there has...

    Started by Mikkelsoeren‎, 08-14-2011 05:31 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 5,838
    08-15-2011, 09:21 AM Go to last post
  30. how to calculate the significance of an R2 increase (based only on results in paper)

    Recently I have come across several articles that report OLS results of models with increasing numbers of variables. In the articles the R2 and...

    Started by PeterV‎, 11-16-2011 04:35 AM
    2 Pages
    1 2
    fit summary, model comparison, model selection, regression, significance of reg
    • Replies: 19
    • Views: 22,454
    11-17-2011, 09:27 AM Go to last post
  31. Probit Regression?

    So I was working on a Logistic Regression with binary DV, but now it turns out that the DV is actually probabilities such that they are between 0 and...

    Started by Autobot‎, 08-16-2012 09:24 AM
    2 Pages
    1 2
    • Replies: 19
    • Views: 3,154
    08-17-2012, 12:01 PM Go to last post
  32. Interaction effect in a logistic regression between cont and cat variables.

    Hi guys, I am conducting a logistic regression on whether a participants test positive or not to HIV (1=positive; 0 Negative) in a sample of...

    Started by Marvin85‎, 04-17-2013 09:48 AM
    2 Pages
    1 2
    interaction effect, logistic, suppressor effect
    • Replies: 19
    • Views: 6,100
    04-30-2013, 10:28 AM Go to last post
  33. Logistic regression diagnostic questions

    I have a set of 42 variables which I am trying to determine the relative importance of. Well I already did but now I am trying to determine if...

    Started by noetsi‎, 03-18-2013 09:41 AM
    2 Pages
    1 2
    • Replies: 19
    • Views: 6,090
    03-20-2013, 10:40 AM Go to last post
  34. A question about OR

    Hello everybody I have a question about interpretation of OR in logistic regression. My result is like this: Dependent variable is satisfaction...

    Started by badibad‎, 05-21-2014 06:24 AM
    2 Pages
    1 2
    • Replies: 19
    • Views: 4,742
    05-25-2014, 02:58 AM Go to last post
  35. Use of partial regression plots to check for non-linearity

    These are commonly recommended to detect non-linearity in interval level predictors. I ran these in SAS and I have a difficult time interpreting the...

    Started by noetsi‎, 03-11-2016 01:53 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 4,374
    03-14-2016, 03:28 PM Go to last post
  36. Dummy Variables

    Is there a limit to the number of independent variables that can be dummy coded for multiple regression as well as linear regression. In other words,...

    Started by stats2013‎, 08-19-2012 09:53 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 5,103
    08-20-2012, 05:15 PM Go to last post
  37. Proper Interpretation of odds ratio less than 1 for my study

    Hello everyone, This is for a PhD, research in psycholinguistics. I have done logistic regression analyses where some chosen predictor...

    Started by MariaF‎, 07-22-2013 04:08 PM
    2 Pages
    1 2
    odds ratio invertibility, odds ratio less than 1
    • Replies: 18
    • Views: 33,611
    03-25-2016, 03:55 PM Go to last post
  38. All my coefficients are statistically significant

    Hi All, I am running a fixed effects model in stata, but all my independent variables are statistically significant. I am wondering if I am doing...

    Started by royalstatus‎, 09-23-2013 05:24 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 5,973
    10-03-2013, 06:21 PM Go to last post
  39. Normality

    I did a test of normality in STATA on my dependent variable. The rest was significant thus violations of normality. After taking the log, there is...

    Started by Jazz3‎, 04-21-2017 11:37 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 1,854
    04-26-2017, 05:39 AM Go to last post
  40. Why a simple linear regression (OLS)

    Hi! This forum is so helpful :tup: I just can't seem to find an answer to my question though. I am planning on doing a multiple regression...

    Started by Jazz3‎, 03-02-2017 08:08 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 5,178
    03-08-2017, 04:04 AM Go to last post
  41. which regression model for time series?

    Hi guys, please help. I need to do regression analysis for demographic data. I am not sure whether linear or logistic regression would be...

    Started by Sylviastat‎, 02-28-2011 02:40 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 11,212
    03-02-2011, 10:59 AM Go to last post
  42. Skew in data

    I have a huge data set, 10,000 points is common. I have significant skew in my data and some large outliers. Some authors argue addressing skew with...

    Started by noetsi‎, 03-14-2016 08:43 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 3,339
    03-18-2016, 05:06 PM Go to last post
  43. Necessary to rank transform ANCOVA?

    Hi all, I'm hoping you can shed some light. My data are non-parametric, so I thought I'd have to use ranks in order to do ANCOVA, but then I read...

    Started by StatsN00bie‎, 08-15-2016 06:21 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 3,527
    08-25-2016, 01:10 AM Go to last post
  44. Relative impact of an X on Y.

    This is probably the most important question I get asked to do, and I have never found a great answer for it (of course there may not be one). If you...

    Started by noetsi‎, 03-13-2017 10:33 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 3,835
    03-14-2017, 03:32 PM Go to last post
  45. How can this be true [linear versus logistic regression]

    This comes from a government study that was used to generate something of great importance, funding and related factors for a major government...

    Started by noetsi‎, 01-07-2017 01:31 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 6,394
    01-15-2017, 02:51 PM Go to last post
  46. Model for regression with multiple binomial predictors?

    Hi everyone, I was wondering what model to pick when all the predictors are binomial distributions. I have a website that's being visited...

    Started by Junes‎, 08-02-2017 03:47 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 937
    08-04-2017, 04:18 PM Go to last post
  47. Beta positive - Slope of best fit line negative

    hello, scratching my head over some regression output i'm getting from Excel. as you can see from below, the best fit line on my indeptendent...

    Started by flatliner‎, 11-29-2011 07:03 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 10,565
    12-01-2011, 03:20 PM Go to last post
  48. GLM: Assumptions and choosing a model

    Hello all, I have a question that I would be interested in hearing other's opinions/feedback. I have monthly cost data from 2006 to 2011 (72...

    Started by lancearmstrong1313‎, 08-22-2012 07:30 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,962
    08-24-2012, 06:26 PM Go to last post
  49. Angry How to choose data for your regression

    Hi guys, I'm developing a statistical method to analyse a player's performance in tennis (annotation). To do this I need to decide on certain...

    Started by ianhargreaves80‎, 07-17-2013 12:22 PM
    2 Pages
    1 2
    regression analysis, spss
    • Replies: 16
    • Views: 4,946
    07-19-2013, 12:16 PM Go to last post
  50. 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: 3,946
    01-27-2015, 02:01 PM Go to last post
  51. Fill in multiple missing values given correlation matrix

    I have a correlation matrix: mat <- round(cor(mtcars), 2) mpg cyl disp hp drat wt qsec vs am gear carb mpg 1.00...

    Started by trinker‎, 04-26-2016 09:51 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,193
    05-01-2016, 09:39 PM Go to last post
  52. Multiple Groups Regression

    Hello to all who view my thread. And thank you in advance for any assistance. I am trying to compare changes in the associations between multiple...

    Started by adzzz‎, 02-13-2009 11:11 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 12,638
    07-20-2012, 04:22 PM Go to last post
  53. Regression when outcome is a rank?

    Is there a particular kind of regression if the outcome is a ranking? I'm wondering if my best bet would be to use the central limit theorem and use...

    Started by zeloc‎, 12-07-2011 08:06 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 20,911
    12-14-2011, 02:36 PM Go to last post
  54. Binomial regression with x as the dependent variable and n as an independent variable

    Hi all I have a sample size of 100. Out of 100 a certain number are successful at stage one. Of those successful at stage one some are successful...

    Started by emily.stats‎, 03-05-2012 04:24 PM
    2 Pages
    1 2
    binomial, challenge
    • Replies: 15
    • Views: 4,567
    03-08-2012, 05:59 PM Go to last post
  55. hierarchical regression for controlling variables?

    For my dissertation, my supervisor told me to do a regression analysis and control for 2 variables. So should I report in my dissertation that I have...

    Started by veggie‎, 08-02-2012 03:24 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 12,866
    08-07-2012, 09:41 AM Go to last post
  56. [SPSS] Multivariable logistic regression - how to transform to achieve linearity?

    Hi, I am doing a project to identify variables that can predict rehospitalisations. There are a few categorical and continuous variables that I...

    Started by Odd90‎, 07-20-2013 05:28 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 15,473
    08-12-2013, 07:05 PM Go to last post
  57. PLS HELP! Regression with non-normally distributed errors

    Hello Everyone, I'm desperatelly looking for help regarding an regression analysis I'd like to conduct. Apparently the residuals/error terms of...

    Started by CheersToStata‎, 07-26-2013 05:03 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,277
    07-26-2013, 02:51 PM Go to last post
  58. Regression Methods

    Hello, I have 1 dependent variable and 30 independent variables. I used forward method for selecting the important variables. The Adjusted R square...

    Started by Bahareh‎, 11-01-2013 03:01 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,646
    11-07-2013, 04:59 PM Go to last post
  59. Bayesian approach for logistic regression models? (the case of low-count cells)

    so... now that i'm a PhD student my advisor wants me to help out people with their projects. as fate may have it, the same problem has arisen both in...

    Started by spunky‎, 12-09-2013 04:26 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,866
    12-10-2013, 01:54 PM Go to last post
  60. 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: 7,359
    01-27-2015, 10:27 AM Go to last post

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