Massimiliano Grassi

9 Questions 19 Answers 0 Followers

Questions related from Massimiliano Grassi

Generalized linear model with limited-range count dependent variable. Which probability distribution?

I have data regarding an experiment. The dependent variable is a count variable ranged 0-5 (n of consecutive days out of 5 in which a subjects experienced a certain condition). I also have two...

31 March 2017 9,888 8 View

In cross-validation, which is the AUC population parameter I really want to estimate?

I’ve found a lot of different procedures to calculate the AUC confidence interval of a cross-validated model. it may sound quite theoretical but it is not clear to me which parameter these CI...

07 February 2017 4,401 6 View

Which Bootstrap for Confidence Interval of AUC with Leave-Pair-Out-Cross-Validation?

I have to calculate the CI of the AUC (Roc) for a series of classifiers (e.g. Lasso, Random Forest, SVM) learned using the same test dataset, in order to identify the best model for this problem...

21 December 2016 6,317 3 View

Moderator Analyses and Metaregression in case of No Heterogeneity?

Hi everyone and thank you in advance for you answers. I'm conducting a metaregression and it turned out that some outcomes shows no heterogeneity among effect-sizes (random-model, DerSimonian and...

10 May 2016 4,259 6 View

How can I calculate a multi-centric ICC (intra-class correlation) variation before and after an agreement training?

Hi and thank you to everybody. I have data regarding a training that aimed to improve the agreement among raters. Raters gave a dichotomous judgment (presence/absence).The study is multi-centric:...

30 June 2015 5,893 3 View

Is it possible to calculate p-value with Bias-Corrected and Accelerated Bootstrapped CI of a Regression Coefficient?

Hi everyone, I'm running a regression model (multiple predictors) with bootstrap resampling. I asked for Bias-Corrected and Accelerated confidence interval (as usually preferred to a percentile...

25 May 2015 2,993 3 View

Is wild bootstrap valid in a “bordeline" case t-test?

I have to compare the mean levels of a continuos variable y (ranging 1-20) subdividing my sample in two groups according to a dichotomous variables (i.e gender). Sample sizes of the two groups are...

09 April 2015 9,468 4 View

What do you think is the most correct procedure for Socio-demographic covariates in regression models and neuropsychological tests?

The following is a recurrent issue in our study and by now no consensus have been reached in my team.   We made our subjects to perform some neuropsychological tests. An italian validation sample...

19 September 2014 4,892 3 View

Intra-class correlation: any test to statistically compare its increase?

I have to compare two ICC calculated by the same three judges on the same sample of subjects (presence/absence of a certain physical dysfunction) after and before a training to improve the judges'...

13 February 2014 3,713 6 View