Build Faster Excel Workflows Using FILTER, IFS, XLOOKUP, and LET for Real-World Data

Learn the difference between Excel COUNT and COUNTA, plus TEXTBEFORE and TEXTAFTER tricks, so you clean text and totals with ...
IEEE

A Sum and Difference Beam Antenna for UAV with A Single Segment Parallel-Strip line Σ-Δ Comparator

Abstract: A sum and difference beam antenna with a novel parallel-strip line Σ-Δ comparator for unmanned aerial vehicle (UAV) is proposed in this paper. The new type of Σ-Δ comparator, which is more ...
National Bureau of Economic Research

Harvesting Differences-in-Differences and Event-Study Evidence

This paper surveys econometric innovations related to differences-in-differences estimators and to event-study models with time-varying treatment effects. Our discussion highlights tricky ...