Singh, I J2015-07-202015-07-201981-06Singh I J. A conception dependent probability distribution of couple fertility. Journal of Biosciences. 1981 Jun; 3(2): 207-214.http://imsear.searo.who.int/handle/123456789/160131A probability distribution for the number of conceptions during a specified period of time is derived assuming that the fecundability as well as the proportion of incomplete conceptions vary between conceptions. A procedure for finding the estimate of some of the parameters has been outlined. The probability model was tested with the date from the Varnasi survey.enFecundabilitycomplete conceptionrest periodfertilityArticle