conception ratio

1. in human demography, the proportion of males to females conceived, which is about 150:100. Male embryos are more vulnerable than female embryos, and the ratio of live births (the birth ratio) is about 105 boys to 100 girls in the United States. See sex ratio.

2. in animal husbandry, the ratio of the number of times a female becomes pregnant to the number of times she is mated.

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Psychology term of the day

December 26th 2024

factor method

any means by which latent variables (factors) are extracted or identified in factor analysis. Widely used factor methods include principal components analysis, which seeks to find a set of linear combinations called components that help explain the correlations among variables; and principal-axis factor analysis, in which underlying dimensions or factors are sought to explain the correlations among variables after separating out communality and putting aside the error variance in a set of variables.