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Reference.org
Polychoric correlation
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<p>In <a href="/facts/Statistics/DNPsKGYU">statistics</a>, polychoric correlation is a technique for estimating the <a href="/facts/Correlation/egkluAEm">correlation</a> between two hypothesised <a href="/facts/Normal_distribution/UapjjPyQ">normally distributed</a> continuous <a href="/facts/Latent_variable/ohg99BnW">latent variables</a>, from two observed <a href="/facts/Level_of_measurement/8GAxPxFv">ordinal variables</a>. Tetrachoric correlation is a special case of the polychoric correlation applicable when both observed variables are <a href="/facts/Dichotomous_variable/3UQNkLqs">dichotomous</a>. These names derive from the polychoric and tetrachoric series which are used for estimation of these correlations. </p>