ageGrid                 Creates an age grid according to a specified
                        format.
boys7482                Growth of Dutch boys
cdc.hgt                 Reference tables from CDC 2000
extractLMS              Extracts LMS values from a gamlss object.
nl3.bmi                 Reference tables from Third Dutch Growth Study
                        1980
nl4.hgt                 Reference tables from Fourth Dutch Growth Study
                        1997
who.wgt                 Reference tables from WHO 2006
wp.twin                 Superposes two worm plots
y2z                     Conversion between measurements y and z-scores
