calcZScores: calcZScores
In UppsalaHenrik/pediutils: Some simple utilities for PMX modelling in paediatrics.

A function that calculates height-for-age, weight-for-age, and BMI-for-age Z-scores based on WHO reference data. Please note that height-for-age is only covered for up to 10 years old in the 2007 WHO growth reference. Returns a data frame with the same number of rows as the input data frame.

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calcZScores(df, idVar = "ID", ageVar = "AGE", weightVar = "WT",
  heightVar = "HT", heightConv = 0.01, weightConv = 1, femaleSexVal = 2,
  maleSexVal = 1, sexVar = "SEX", ageUnit = "years", missingVal = -99)

`df`	A data frame with all necessary columns for calculation of Z-scores.
`idVar`	Name of the id column in df. Default is "ID" but it is not case sensitive.
`ageVar`	Name of the age column in df. Default is "AGE" but it is not case sensitive.
`weightVar`	Name of the weight column in df. Default is "WT" but it is not case sensitive.
`heightVar`	Name of the height column in df. Default is "HT" but it is not case sensitive.
`heightConv`	Height conversion factor to meters. Height*heightConv is height in meters. Default is 0.01, meaning that centimeters is expected in data.
`weightConv`	Weight conversion factor to kilograms. Default is 1, meaning that kilograms is expected in data. There is currently no support for stones or pounds.
`femaleSexVal`	The value denoting female sex in the supplied df. Default is 2.
`maleSexVal`	The value denoting male sex in the supplied df. Default is 1.
`sexVar`	Name of the sex column in df. Default is "SEX" but it is not case sensitive.
`ageUnit`	A single string describing the unit for age in the data. "years", "months", or "days" are allowed. Defult is "years" but it is not case sensitive.
`missingVal`	The value that will be inserted in place of Z-scores that cannot be determined. Either because age is out of bounds of the reference WHO data, or because one of the required values for age, weight, or height was missing from input data. Default is -99 according to Perl speaks NONMEM standard.