Approximations for the Normal Family Distribution Function Using Micro Computer

마이크로컴퓨터를 이용(利用)한 정규확률군(正規確率群) 분석함수(分布函數)의 근사계산(近似計算)에 관한 연구(硏究)

A different kind of approximation has been developed in connection with calculation of the normal family distributions in digital computer. These approximations usually employ polynomial expressions. They give quite high accuracy, sometimes only within definite limits on the values of the variable. Outside these limits they may give quite poor approximations. In this paper we compare these approximations by criteria of C.P.U. time and accuracy using micro computer. Approximation formulas given by Zelen and Severo (1984) are proven to give the most accurate results within allowable C.P.U. time.