Abstract

Frequently measurements are made under conditions which are either hard to specify precisely or difficult to hold constant for any considerable period. Corrections for drifts or shifts arising from these uncontrolled conditions are often based on measurements made upon control or standard samples periodically introduced in the work schedule. These standard samples make possible the adjustment of the measurements on the test samples at the price of diverting effort that might otherwise be spent on test samples. The standard samples may be dispensed with by picking out certain ones of the test samples for measurement at a later time. This paper presents some schedules for the selection of test samples for remeasurement. When the schedule possesses a balanced symmetry the arithmetical operations for adjusting the observations become simple and easy. Furthermore, all the measurements made contribute information on the test sample.

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