Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Representative sampling and random sampling ...

Sankhyā: The Indian Journal of Statistics, Series B (1960-2002) Vol. 55, No. 3, Special Issue Dedicated to the Memory of P. C. Mahalanobis (Dec., 1993), pp. 385-392 (8 pages) The purpose of this paper ...