Accession Number : ADP001588

Title :   The Perversity of Missing Points in the 2(4) Design,

Corporate Author : ARMY COLD REGIONS TEST CENTER FORT GREELY AK

Personal Author(s) : Russell,Carl T.

Report Date : JUN 1983

Pagination or Media Count : 25

Abstract : The author would like better to understand the impact of missing data on estimability (and variance) in 2 to the n power factorials and 2 to the n-k power fractional factorials. Hoping to find generalizable results, the author examined the 2 to the 4th power design to determine what points could be deleted without losing estimability of main effects and 2-factor interactions (resolution V property). He was guided by a result of P. W. M. John which shows that if a fraction is missing from a 2 to the n power design, then estimable effects are those estimable from half replicates, and the least squares estimates are obtained by averaging the estimates from half replicates.

Descriptors :   *Factorial design, *Statistical processes, Numerical methods and procedures, Computations, Points(Mathematics), Experimental design, Least squares method, Estimates, Field tests

Distribution Statement : APPROVED FOR PUBLIC RELEASE