An infinite class of PBIB designs

In this paper, an infinite class of partially balanced incomplete block (PBIB) designs of m+1 associate classes is constructed through the use of a series of row-orthogonal matrices known as partially balanced orthogonal designs (PBOD) of m-associate classes. For the purpose, a series of PBOD is obtained through a method described herein. An infinite class of regular GD designs is also reported.     

Son survivorship motivation and family size in India: A computer simulation

Abstract Many sociologists and demographers have argued that the comparatively large families of six to eight children found in rural India to-day result from ignorance of family planning methods, from tradition, and from passive indecision; and that large reductions in the Indian growth rate to Western levels would occur spontaneously if each Indian family were given access to birth control facilities, materials and information. On the other hand, it has been maintained that large family sizes are functional for rural families in India and other developing countries; and that they result from conscious or unconscious choice based upon enlightened self-interest.