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# S3 method for fmx
confint(object, ..., level = 0.95)confint.fmx returns a matrix
fmx object
place holder for S3 naming convention
confidence level, default \(95\%\).
confint.fmx returns the Wald-type confidence intervals based on the user-friendly parameters (parm = 'user'),
or the internal/unconstrained parameters (parm = 'internal').
When the distribution has constraints on one or more parameters,
function confint.fmx does not return the confident intervals of for the constrained parameters.