But if the use of the lottery as an instrumental variable works in practice as it is expected to work in statistical theory, it would already have corrected for these differences. (educationnext.org)
In recent work, he linked economic theory with statistical theory to study how best to measure teacher quality, an important input to education reform policies. (edimpactlab.com)
No known statistical theory suggests that limiting the number of principal components used in regression leads to good predictions, although this practice has been found to work well in many applications. (nap.edu)