Creates the inverse cumulative density function from a current
distribution suitable for censored or interval response variable data.
This is a dummy function identical to the uncensored one but it is needed for
consistency in centile estimation from censored data.
for extra arguments
This is dummy function, used only to calculate centiles from censored response
This function is not supposed to be used on its own but is used by the function
Returns a modified q family function. The argument of the original function q function are the same.
For an example see
Rigby, R. A. and Stasinopoulos D. M. (2005). Generalized additive models for location, scale and shape,(with discussion), Appl. Statist., 54, part 3, pp 507-554.
Stasinopoulos D. M., Rigby R.A. and Akantziliotou C. (2006) Instructions on how to use the GAMLSS package in R. Accompanying documentation in the current GAMLSS help files, (see also http://www.gamlss.org/).
Stasinopoulos D. M. Rigby R.A. (2007) Generalized additive models for location scale and shape (GAMLSS) in R. Journal of Statistical Software, Vol. 23, Issue 7, Dec 2007, http://www.jstatsoft.org/v23/i07.
#see the help for function cens for an example
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