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13.5 _log Density and Mass Functions
Deprecated: The probability function for the distribution foo will
be applied to an outcome variable y and sequence of zero or more
parameters ... to produce the expression foo_log(y, ...).
Replacement: If y can be a real value (including vectors
or matrices), replace
foo_log(y, ...)
with the log probability density function notation
foo_lpdf(y | ...).
If y must be an integer (including arrays), instead replace
foo_log(y, ...
with the log probability mass function
foo_lpmf(y | ...).