This article develops some general theory for testing the rank of a matrix. Applications include tests of interaction in two-factor experiments that are more powerful than the usual F test for certain ...

This is a preview. Log in through your library . Journal Information PNAS is the world's most-cited multidisciplinary scientific serial. It publishes high-impact research reports, commentaries, ...

Sometimes, to appreciate a new technology or technique, we have to get into the weeds a bit. As such, this article is somewhat more technical than usual. But the key message that new libraries called ...