Robustness to the unavailability of data in block designs

We present general results for finding or boundingt _maxB , the maximum number of arbitrary whole blocks of observations which can be removed from a block design, and still leave all of the elementary treatment contrasts estimable. The block sizes may be larger than the number of treatments. The results are applied to BBDs, reinforced BIBDs and BBDs, BTIBDs, and a series of variance balanced incomplete block designs with two block sizes. Also given for most of these designs, are results fort _max, the maximum number of arbitrary, scattered observations that can become unavailable, and still leave all of the elementary treatment contrasts estimable.The work was undertaken while Dr. Whittinghill was visiting Ohio State University, and supported by a grant from the Natural Sciences Division, Colby College, Waterville, Maine.     

Forecasting first births

This study is concerned with one aspect of the family cycle, namely, the transition from young married to young married with small children. The focus is on developing models to forecast entries into this latter stage for the purpose of marketing research. "Using ordinary least squares, forecasting models were estimated for (1) total number of first births, (2) number of white first births, and (3) number of nonwhite first births." Models are estimated for both the United States and California using data from official sources.     

NSSM 200 and the world population explosion

This paper was published in the wake of Pope John Paul II's encyclical 'Evangelicum Vitae', which condemns abortion and contraception. The author describes how, in the mid-1970's, the Vatican blocked the implementation of President Nixon's 'National Security Study Memorandum 200', which was intended to combat global overpopulation. The author explains that excessive population growth is considered threatening to U.S. security interests, and concludes that "papal security-survival along with the influence of fundamentalist Protestant opposition to birth control is now pitted against the U.S. and world security-survival."