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A Dirichlet moved so its mode sits at given fractions

Source: R/sim_self_test.R
dirichlet_mode_at.Rd

The concentration (the sum of alpha) is kept, so the prior keeps its strength and loses its pull at frac. A Dirichlet whose concentration is at or below its number of cells has no interior mode and is returned as given.

Usage

dirichlet_mode_at(alpha, frac)

Arguments

alpha

Concentration vector.

frac

Fractions summing to one, the same length.

Value

The moved alpha.