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Why Does an Observational Study Have a Greater Risk of Selection

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Why does an observational study have a greater risk of selection bias than an experimental study?


Definitions:

Same-Sex Couples

Romantic partnerships between two individuals of the same sex or gender identity.

Heterosexual Counterparts

Individuals or counterparts of the opposite sex in the context of heterosexual relationships or comparisons.

Lesbian Mothers

Women who identify as lesbians and are mothers, either through biological means, adoption, or as step-parents.

Median Age

A statistic that divides a population into two equal groups, such that half the population is younger than this age and the other half is older.

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