Antonio Irpino

5 Questions 14 Answers 0 Followers

Questions related from Antonio Irpino

Given the marginals of a contingency table, what is the maximum observable value for the $\chi^2$ Pearson statistic?

I know that given a R×C contingency table observed on N subjects, the maximum value of $\chi^2$ statistics is N⋅[min(R,C)−1]. But, this value is independent of given margins (namely, row totals...

01 January 2019 5,088 0 View

Cross validation of unsupervised classification, how to do it?

Unsupervised classification (clustering) is a wonderful tool for discovering patterns in data. I know that it is also an ill-posed problem, but is it thinkable to do cross validation, for example...

05 May 2018 3,956 3 View

Can someone advise on evaluating the sensitivity to initialization in weighted k-means?

I am working on a k-means algorithm that embodies a step of variable weighting. In each step is assigned a different weight to each variable according to a contribution to the cluster measure. The...

10 October 2013 6,845 4 View

Cause-effect dilemma?

Last week I came accross this Kaggle challenge: http://www.causality.inf.ethz.ch/cause-effect.php. So, my question is, there existS a "statistical way" to suggest that X is the cause of Y (or...

08 August 2013 5,683 11 View

Density estimation or probability estimation?

I am working on histograms because histogram is a very parsimonious way of storing a distribution of observed values. In order to overcome the problem of the choice of the width of bins, I devised...

04 April 2012 7,398 1 View