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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Exclamation GLM diagnostic plots in r

    I am trying to fit a Gamma glm in R. getting very weird diagnostics even though all variables are significant. Please advise as to how i can improve...

    Started by doy_h(r)‎, 06-04-2015 02:56 PM
    • Replies: 3
    • Views: 3,108
    06-05-2015, 07:49 AM Go to last post
  2. Residual plots (against y vs y hat)

    I'm reading up on residual analysis and am trying to apply to some data using multiple regression. The residual plot (std res vs the regression...

    Started by Value Ninja‎, 06-02-2015 05:33 PM
    • Replies: 3
    • Views: 5,941
    06-05-2015, 02:39 AM Go to last post
  3. Replication in linear regression. General Estimating Equations (GEE) a good option?

    or is it the only option? I've been collecting hosts in 3 different habitats, about 20 hosts every sampling trip. I've been recording prevalence...

    Started by Saccharo‎, 06-03-2015 03:02 PM
    general estimating, linear regression, replications
    • Replies: 3
    • Views: 2,355
    06-04-2015, 01:03 PM Go to last post
  4. Ordered Probit Model

    I am using the ordered probit model in my regression, and I have some questions. 1. What are the basic assumptions? 2. which tests should be run?...

    Started by Ellinor Hjelvik‎, 06-03-2015 07:29 PM
    • Replies: 0
    • Views: 1,607
    06-03-2015, 07:29 PM Go to last post
  5. Interpretation of Cross validation (in Logistic Regression) results

    Hello! I am faced again with Logistic Regression, and in particular binary LR, in a study that I am faced with trying to assess the impact of some...

    Started by gianmarco‎, 06-03-2015 01:53 AM
    • Replies: 0
    • Views: 2,568
    06-03-2015, 01:53 AM Go to last post
  6. Comparing coefficients in Logistic Regression

    Hello ! I would like to have guidance on what follows. I was fitting a Logistic Regression model, and I got the coefficients for the model's...

    Started by gianmarco‎, 07-29-2014 07:08 AM
    • Replies: 14
    • Views: 9,607
    06-02-2015, 09:08 AM Go to last post
  7. Getting VIF from R

    Hello! I was wondering how to get the VIF value for predictors in R (namely, in the context of Logistic Regression). I have read that there is a...

    Started by gianmarco‎, 06-02-2015 08:25 AM
    • Replies: 1
    • Views: 2,782
    06-02-2015, 08:38 AM Go to last post
  8. Find the Most Important Variables In Predictive Models

    Hi, I have a target variable Y, and twenty predictors (input variables) X1,X2,...,X20. I can predict Y by its predictors X1,X2,...,X20....

    Started by mojassameh‎, 06-02-2015 06:56 AM
    • Replies: 1
    • Views: 1,283
    06-02-2015, 07:16 AM Go to last post
  9. Ordinal vs Multinomial

    I am interested why predicted probabilities for ordinal and multinomial regressions differ? Can we explain this difference in terms of multinomial...

    Started by Dannysaf‎, 05-31-2015 05:25 PM
    • Replies: 0
    • Views: 1,200
    05-31-2015, 05:25 PM Go to last post
  10. step wise regression and bootstrap method

    anyone able to help me with an article i am critiquing? I wanted to do mediation model and I think the authors have used incorrect method but not...

    Started by howanru‎, 05-30-2015 08:15 PM
    • Replies: 1
    • Views: 1,255
    05-31-2015, 05:53 AM Go to last post
  11. Logistic Regression as Data Transform?

    Hello everyone, new here, glad to be here! I have what might be an unorthodox question. I use the matlab function 'mnrfit' ...

    Started by hcc‎, 05-30-2015 10:09 PM
    anova, data transformation, logistic regression, matlab, normal distribution
    • Replies: 1
    • Views: 1,521
    05-30-2015, 10:18 PM Go to last post
  12. Help with running two level binary logistic regression model

    Hello everyone, It is my first time when I am performing quantitative research. My master thesis is about determining specialist level and...

    Started by Evelina‎, 05-28-2015 09:35 AM
    • Replies: 1
    • Views: 1,233
    05-28-2015, 11:12 AM Go to last post
  13. Including cross-sectional variables in panel data analysis -- can I do that?

    Hello dear forum members, I have a panel data set with a count outcome variable. As far as I understand, Yit is conditional on Xit in panel...

    Started by kiton‎, 05-27-2015 12:16 AM
    • Replies: 3
    • Views: 1,274
    05-27-2015, 02:26 PM Go to last post
  14. Is logistic regression appropriate for this study?

    A study that compares 3 different categorical outcomes

    Started by professorzoom‎, 05-17-2015 07:00 PM
    • Replies: 1
    • Views: 1,299
    05-27-2015, 12:00 AM Go to last post
  15. Post Comando para correlacion contemporanea (modelo efectos aleatorios

    Buenas noches compañeros, busco un comando para el software stata 13.1, para poder estimar la correlacion contemporanea, para el modelo de efectos...

    Started by Juan Carlos 1991‎, 05-25-2015 09:26 PM
    • Replies: 2
    • Views: 1,772
    05-26-2015, 09:14 AM Go to last post
  16. Reporting logistic regression results

    Hi, I have a study that aims to find out the association of a binary outcome (e.g. BP control-Y/N) with categorical independent variables e.g....

    Started by Yi Ling‎, 05-25-2015 02:52 AM
    interpretation, logistic regression
    • Replies: 3
    • Views: 2,941
    05-25-2015, 10:29 PM Go to last post
  17. Significant effect disappears when separate analyses are conducted

    Dear all I have conducted an experiment in which subjects concurrently perform two tasks. Task A stays always the same, while Task B has two...

    Started by Scarlatti‎, 05-21-2015 10:14 PM
    • Replies: 0
    • Views: 1,186
    05-21-2015, 10:14 PM Go to last post
  18. The Dummy Variable Alternative to the Chow Test

    Hello, I'm writing a paper for econometrics. The deadline is approaching, but we have some problems with answering a question about the model that...

    Started by econometrics‎, 05-21-2015 04:34 PM
    • Replies: 0
    • Views: 3,357
    05-21-2015, 04:34 PM Go to last post
  19. Errors on fit parameters with no errors on data

    Hi all Many, maybe all, statistical packages I know of (R, matlab, root, sas) will allow you to fit data with no associated errors, and give you...

    Started by jonascj‎, 05-20-2015 11:38 PM
    errors, fit
    • Replies: 0
    • Views: 1,740
    05-20-2015, 11:38 PM Go to last post
  20. Estimate of Variance

    How does one obtain the best estimate of the variance of observations around the fitted model in SPSS? My thinking is that the best estimate of...

    Started by helppleasestats‎, 05-19-2015 06:36 PM
    fitted model, regression
    • Replies: 0
    • Views: 1,619
    05-19-2015, 06:36 PM Go to last post
  21. Hell Please. Linear Regression Model

    Which of the following is NOT assumed to contribute to uncertainty in predicting y from x in a standard Model I linear regression. a. Uncertainty...

    Started by helppleasestats‎, 05-18-2015 08:57 AM
    help me, linearregression, mcq
    • Replies: 8
    • Views: 1,838
    05-19-2015, 09:42 AM Go to last post
  22. Residual variance of OLS regression from R-Squared?

    Can residual variance of OLS regression be derived from R-Squared, and if so, how?

    Started by BigBugBuzz‎, 05-16-2015 03:04 PM
    r-square, residual
    • Replies: 2
    • Views: 1,906
    05-17-2015, 11:51 AM Go to last post
  23. logistic regression for customer data

    Hey guys, i'm supposed to build a logistic model, but i'm not quite sure how to begin. i have two data sets. One for the customers( all...

    Started by Lisa_‎, 05-16-2015 09:16 AM
    • Replies: 0
    • Views: 1,164
    05-16-2015, 09:16 AM Go to last post
  24. New with Stata - Changes in Beta event study question

    Hello, I am trying to do an event study regarding beta and check if beta changes after stock splits dates. I am planning on checking if the...

    Started by Quatze‎, 05-14-2015 06:16 PM
    • Replies: 0
    • Views: 1,487
    05-14-2015, 06:16 PM Go to last post
  25. Paired/Matched Sample with Hierarchical Moderated Regression Question

    Hello Everyone, I would greatly appreciate some help with this question. I am trying to help a good friend with her dissertation and am now...

    Started by psycgirl‎, 05-14-2015 05:14 PM
    • Replies: 0
    • Views: 1,255
    05-14-2015, 05:14 PM Go to last post
  26. Time series regression with blocks of years?

    I am evaluating the impact of policy changes over time. There are three separate time periods, each representing a number of years, and I want to see...

    Started by katiegud‎, 05-14-2015 06:16 AM
    • Replies: 3
    • Views: 2,430
    05-14-2015, 03:29 PM Go to last post
  27. Independent Variables and Dependent Variable Regression Analysis

    I came across this question which best explain what a need in one of the forum, however it was not answered. Please assist based on the scenario...

    Started by Mosima‎, 05-12-2015 02:39 PM
    • Replies: 7
    • Views: 1,720
    05-14-2015, 01:55 AM Go to last post
  28. GLS regression STATA

    Hi, is there a command in Stata that allows for GLS regression without panel data? or am I missing something? Thanks

    Started by harleystats‎, 05-13-2015 06:00 PM
    regression analysis, regression help
    • Replies: 0
    • Views: 2,870
    05-13-2015, 06:00 PM Go to last post
  29. Nested data structure

    Hi, I wonder whether the community can help. The goal is to run a series of regressions with correctly estimated standard errors. Note that the...

    Started by dnh‎, 05-13-2015 05:59 AM
    • Replies: 0
    • Views: 1,534
    05-13-2015, 05:59 AM Go to last post
  30. Regression with averaged data

    I have data that represents the average for a group, which I would like to use for my response variable. I have different variables that are...

    Started by twotone4‎, 05-12-2015 08:24 PM
    averages, regression
    • Replies: 0
    • Views: 1,989
    05-12-2015, 08:24 PM Go to last post
  31. Logistic regression and significance of continuous variables across 3 periods

    I'm currently working on a logistic regression analysis in R with a binary response variable (0 = non-used; 1 = used location). I am modeling...

    Started by arl139‎, 05-12-2015 07:28 AM
    logistic regression, regresiion
    • Replies: 3
    • Views: 1,791
    05-12-2015, 12:22 PM Go to last post
  32. Multiple Regression - Is it possible to constrain the coefficients to be positive?

    Another stumper ... I am running a multiple regression with two independent variables. The regression results look good, except that one coefficient...

    Started by statburner‎, 05-11-2015 01:08 PM
    • Replies: 6
    • Views: 2,148
    05-11-2015, 07:26 PM Go to last post
  33. Linear regression on a weighted moving average

    Hi, I was hoping to get some advice. I want to run a forecast using linear regression but wanted to account for any potential cyclic variations in...

    Started by Indigosoul‎, 05-11-2015 04:52 PM
    • Replies: 0
    • Views: 1,377
    05-11-2015, 04:52 PM Go to last post
  34. β and b

    Hi, Just starting with regression analysis but am confused with the interchangeability of β and b. Can someone clarify the difference? Thank...

    Started by stats_challenged‎, 05-11-2015 04:49 AM
    • Replies: 3
    • Views: 2,810
    05-11-2015, 04:31 PM Go to last post
  35. Determining if Cook's D is influential

    Hi there, I have been having a lot of difficulty calculating if Cook'd values are influential. I realise that there are no exact rules, but I am...

    Started by tbuzz‎, 05-10-2015 08:55 PM
    • Replies: 0
    • Views: 1,579
    05-10-2015, 08:55 PM Go to last post
  36. Logistic regression - Violations of observations independence

    Hi, I need some help about logistic regression. My participants were divided in 2 groups (control group and experimental group). They then...

    Started by Gorgonzola‎, 05-09-2015 03:56 PM
    • Replies: 0
    • Views: 1,751
    05-09-2015, 03:56 PM Go to last post
  37. Regress help

    Hey everyone, I have a problem I was wondering for help. I have the regression model for a class, and i choose to predict returns on stocks with...

    Started by ko86804n‎, 05-08-2015 01:28 PM
    • Replies: 3
    • Views: 1,717
    05-08-2015, 11:12 PM Go to last post
  38. Combining variables prior to performing regression analysis

    Hello to all. I am running a regression analysis to evaluate if the joint analysis of costs and benefits can explain medicinal plant selection better...

    Started by patri‎, 05-04-2015 05:20 PM
    combining variables, linear regression, multiple regression, simple regression
    • Replies: 3
    • Views: 1,995
    05-08-2015, 05:01 PM Go to last post
  39. Regression Excel Output - Missing Values

    Hey guys, I've attached a screen shot of the table we have to use for my stats final. This is what we had on the midterm earlier this semester...

    Started by schmitam12‎, 05-08-2015 09:06 AM
    • Replies: 0
    • Views: 1,677
    05-08-2015, 09:06 AM Go to last post
  40. Question creating a statistical Analysis for treatment validation with placebo cond.

    Hi there, promising board of infinite knowledge, 1. Randomizing the Conditions This is what I want to do. One individual, two conditions. ...

    Started by LeeFX‎, 05-08-2015 05:03 AM
    • Replies: 0
    • Views: 1,126
    05-08-2015, 05:03 AM Go to last post
  41. One observation per factor level combination in regression

    Hi... I was wondering if you can perform multiple linear regression with a mix of categorical and quantitative variables, if you only have one...

    Started by twotone4‎, 05-07-2015 02:23 PM
    factor, multiple regression, prediction, regression
    • Replies: 2
    • Views: 1,590
    05-07-2015, 09:46 PM Go to last post
  42. Post Help with interpreting results of a bivariate probit regression please

    I have recently run this regression using Stata and the command biprobit. However, I am a complete newbie to statistics and I need some help...

    Started by jemma‎, 05-07-2015 02:47 AM
    • Replies: 0
    • Views: 2,115
    05-07-2015, 02:47 AM Go to last post
  43. Linear Regression - Influence of experience on wage

    Hello Talk-Stats-Members, i am new to the forum and already have a (in my eyes) complex theoretical problem that i hope you can help me with. I...

    Started by Michael_‎, 05-05-2015 02:37 PM
    • Replies: 4
    • Views: 2,473
    05-06-2015, 03:30 PM Go to last post
  44. Interpreting PROCESS Output

    Hi everyone, Does anyone know of any good resources to help interpret the process macro output, specifically for model 14? I have the book but it...

    Started by ck926‎, 05-06-2015 09:48 AM
    • Replies: 3
    • Views: 4,256
    05-06-2015, 10:11 AM Go to last post
  45. [SPSS - Logistic Regression] Resolve the linearity of logit assumption

    I am running a logistic regression and my income variable violates the linearity of the logit assumption. It is not negatively effecting the...

    Started by kdiallo11‎, 05-02-2015 03:37 PM
    linearity of logit, logistic regression, regression assumption
    • Replies: 3
    • Views: 4,942
    05-06-2015, 08:42 AM Go to last post
  46. RESET test Statistic

    Below is my question - I've never done a RESET calculation before so just seeking some guidance on how to start. I believe I need to add a quadratic...

    Started by dingo007‎, 05-05-2015 08:21 PM
    • Replies: 1
    • Views: 1,483
    05-05-2015, 10:13 PM Go to last post
  47. Thumbs up Normally/non-normally distributed data - initial significance testing

    Hi all, I would be grateful if anyone can direct me please. I am looking to 1. look at predictors of my DV (when controlling for confounders)...

    Started by HT3‎, 05-04-2015 11:23 AM
    • Replies: 1
    • Views: 1,144
    05-04-2015, 04:39 PM Go to last post
  48. optimal sample size

    I'm performing a regression analysis (OLS) and I have the luxury that my sample size is very high (5.000 observations) compared to the number of...

    Started by surveyman‎, 05-01-2015 04:27 AM
    • Replies: 6
    • Views: 1,715
    05-04-2015, 11:25 AM Go to last post
  49. Red face how to control foe age-wave1 when running a mixed model analysis

    Hi guys, I am running a linear mixed model in SPSS. My research question is: Does a reward-related personality trait at baseline predict weight...

    Started by fernandamata‎, 05-01-2015 06:57 PM
    • Replies: 0
    • Views: 1,194
    05-01-2015, 06:57 PM Go to last post
  50. P-Values equal to zero

    Hi, I am running simple OLS regressions on forward and spot price data and have been getting p-values equal to exactly 0 (i.e. not 0.0000000234) for...

    Started by harleystats‎, 04-30-2015 09:56 PM
    p value, p values
    • Replies: 1
    • Views: 1,635
    04-30-2015, 10:05 PM Go to last post
  51. How to separate categorical variables in modeling

    Suppose I have a dataset as follows: Product Week Type Num times ad shown Purchases 1 2/2/13 young,old,hipster ...

    Started by lord12‎, 04-30-2015 10:32 AM
    • Replies: 0
    • Views: 994
    04-30-2015, 10:32 AM Go to last post
  52. Probit Regresion

    Hi all. What does categ.(factors) and count data mean in probit regression? Categ.(factors) mean covariate or something like that?

    Started by chivasrom‎, 04-30-2015 07:23 AM
    • Replies: 2
    • Views: 1,586
    04-30-2015, 07:51 AM Go to last post
  53. Logistic Regression: Classification table vs. Chi-square?

    Hello, I'm using binary logistic regression for my bachelor thesis (psychology). My problem is that the classification table does not change...

    Started by kazu‎, 03-27-2013 05:51 AM
    • Replies: 5
    • Views: 5,693
    04-30-2015, 04:31 AM Go to last post
  54. How can you deal with categorical variables that aren't present in your training set?

    Let's say I have the following linear regression: earnings = c0 + age * c1 + male * c2 where "male" is a categorical variable and "female" is...

    Started by billybass‎, 04-29-2015 06:24 PM
    • Replies: 1
    • Views: 1,645
    04-30-2015, 02:37 AM Go to last post
  55. Comparing two linear regression gradients?

    Hi, I am completely new to linear regression so this may sound daft, but I'm wondering if its possible to test for a significant difference between...

    Started by becread95‎, 04-25-2015 08:24 AM
    • Replies: 6
    • Views: 5,044
    04-29-2015, 09:08 AM Go to last post
  56. Comparing Models

    Today I was going to attempt to figure out and write some SAS code to compare nested linear models (variance explained). But I need some basics...

    Started by hlsmith‎, 04-28-2015 09:12 AM
    • Replies: 8
    • Views: 2,287
    04-28-2015, 01:31 PM Go to last post
  57. multilevel modelling: predicting random effects for new clusters

    Hi: I have a query I'm hoping someone may be able to help with. I've chatted to a few people and looked at texts and the literature but haven't...

    Started by sigmundo‎, 04-24-2015 05:06 AM
    • Replies: 9
    • Views: 3,077
    04-28-2015, 11:13 AM Go to last post
  58. 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: 5,473
    04-28-2015, 07:47 AM Go to last post
  59. Interpret continuous variables in binary regression model

    I have produced three binary regression models, each showing the odds ratios (ORs) for an outcome (attendance versus non-attendance) Each...

    Started by jle‎, 04-26-2015 09:38 PM
    • Replies: 7
    • Views: 1,693
    04-28-2015, 01:58 AM Go to last post
  60. Difference-in-Differences(Evaluate effect of a policy implemented gradually)

    Hi I have to do a diff-in-diff estimator in order to evaluate the impact of the policy. The problem is that the policy is gradually implemented...

    Started by adrift‎, 04-25-2015 07:15 PM
    • Replies: 0
    • Views: 1,268
    04-25-2015, 07:15 PM Go to last post

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