student() defines a one-response Student-t distribution with formulas for
location mu, residual scale sigma, and degrees of freedom nu.
Value
A drm_family object.
Details
The nu parameter uses a log link with a lower bound of 2:
nu = 2 + exp(eta_nu). This keeps the fitted distribution in the
finite-variance region while still allowing heavy tails.
Examples
student()
#> $name
#> [1] "student"
#>
#> $family
#> [1] "student"
#>
#> $n_response
#> [1] 1
#>
#> $dpars
#> [1] "mu" "sigma" "nu"
#>
#> $links
#> mu sigma nu
#> "identity" "log" "logm2"
#>
#> attr(,"class")
#> [1] "drm_family"
