117 citations · 323 across the 20 of their papers we have counts for
4 papers · 1 filter
The Effect of Class Imbalance on Precision-Recall Curves
Christopher K I Williams
In this note I study how the precision of a classifier depends on the ratio of positive to negative cases in the test set, as well as the classifier's true and false positive r…
VAEs in the Presence of Missing Data
Mark Collier, Alfredo Nazabal, Christopher K. I. Williams
Real world datasets often contain entries with missing elements e.g. in a medical dataset, a patient is unlikely to have taken all possible diagnostic tests. Variational Autoencode…
Data Engineering for Data Analytics: A Classification of the Issues, and Case Studies
Alfredo Nazabal, Christopher K. I. Williams, Giovanni Colavizza +2
Consider the situation where a data analyst wishes to carry out an analysis on a given dataset. It is widely recognized that most of the analyst's time will be taken up with \emph{…
An Evaluation of Change Point Detection Algorithms
Gerrit J. J. van den Burg, Christopher K. I. Williams
Change point detection is an important part of time series analysis, as the presence of a change point indicates an abrupt and significant change in the data generating process. Wh…