ormat that is compatible
with R data.frame methods. This data must have at least one column named
`subject` that has a unique identifier for each subject's data.</p>
<p>Additionally the user should provide a function that when given a set of
parameter estimates and the data for a single subject return the log of the
likelihood of that data given the parameter estimates.</p>
<p>The final piece of required information is a list of the names of each
parameter that should be estimated. There is also the capabil