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fix some typos in man/coerce_index.Rd #418

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fix some typos in man/coerce_index.Rd #418

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2 changes: 1 addition & 1 deletion man/coerce_index.Rd
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Expand Up @@ -18,7 +18,7 @@ check_index( x )
\details{
Varying effect models often require index variables that begin at 1 and comprise only integers. These variables are used to lookup specific parameter values inside of the model. For example, it is common to define varying intercepts with a linear model like \code{a0 + a_id[id[i]]}. Here the variable \code{id} is an index variable. It has one value for each case, defining which individual applies to that case.

When raw data exist as factors, these index variables much be converted to integers. This is trickier than it sounds, because R uses an internal integer represntation for factors, \code{levels}, that can conflict with ordinary integer representations.
When raw data exist as factors, these index variables must be converted to integers. This is trickier than it sounds, because R uses an internal integer representation for factors, \code{levels}, that can conflict with ordinary integer representations.

The function \code{coerce_index} deals with that complication. When the input is a single vector of factors, it returns an integer vector beginning at 1 and with contiguous values.

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