The availability of data for the size of the “underground economy” (UE) is important for macroeconomic policy. We use fuzzy set theory and fuzzy logic to construct an annual time-series for the (unobservable) New Zealand UE over the period 1968–1994. Two input variables are used—the effective tax rate and an index of the degree of regulation (REG). The resulting UE time-series is compared with ...

We present a method for identifying errors in EHRs caused by copying and pasting text containing relative dates. Our method utilizes a sequence alignment method for recognizing instances of copy/paste, and regular expressions for relative dates. We furthermore present an analysis of our method on the MIMIC-II dataset. Introduction Electronic health records (EHR) are a powerful enabling technolo...

This paper considers an MIG/c queueing system serving a finite number (J) of distinct customer classes. Performance of the system, as measured by the vector of steady-state xpected waiting times of the customer classes (the performance vector), may be controlled by adopting an appropriate priority discipline. We show that the performance space, the set of performance vectors which are achievabl...

The study of Latino public opinion has renewed interest in the relationship between language and survey response. However, extant research generally relies on statistical methods that cannot distinguish between two related yet distinct types of language effects in Latino surveys: (1) differences in attitude and (2) differences in measures of attitude. The former reflects varied levels of a late...