volunteer bias:

Defined by Janet Shibley and John D . DeLamater in Understanding Human Sexuality (1997): ' A problem in sex research caused by some people refusing to participate, so that those who are in the sample are volunteers who may in some ways differ from those who refuse to participate .'
See Also: adultism, gender-free language, heterosexism, nonsexist language, pre-woman, woman of size, womanist

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