sds {childsds}

Calculate SDS Values

Description

Calculate SDS values

Usage

sds(value, age, sex, item, ref, type = "SDS", male = "male", female = "female")

Arguments

value

vector of measurement values

age

vector of age values

sex

vector of sex

item

name of the item e.g. "height"

ref

RefGroup object

type

"SDS" or "perc"

male

coding of sex for male

female

coding of sex for female

Details

The function takes a vector of measurement values, and of age and of sex and a RefGroup object as arguments. It calculates the sds or percentile values.

Value

vector containing SDS or percentile values

Author(s)

Mandy Vogel

Examples

anthro <- data.frame(age = c(11.61,12.49,9.5,10.42,8.42,10.75,9.57,10.48),
                     height = c(148.2,154.4,141.6,145.3,146,140.9,145.5,150),
                     sex = sample(c("male","female"), size = 8, replace = TRUE),
                     weight = c(69.5,72.65,47.3,51.6,45.6,48.9,53.5,58.5))
anthro$height_sds <- sds(anthro$height,
                         age = anthro$age,
                         sex = anthro$sex, male = "male", female = "female",
                         ref = kro.ref,
                         item = "height",
                         type = "SDS")

anthro$bmi <- anthro$weight/(anthro$height**2) * 10000
anthro$bmi_perc <- sds(anthro$bmi,
                       age = anthro$age,
                       sex = anthro$sex, male = "male", female = "female",
                       ref = kro.ref,
                       item = "bmi",
                       type = "perc")
data(who.ref)
x <- data.frame(height=c(50,100,60,54),
                sex=c("m","f","f","m"),
                age=c(0,2.9,0.6,0.2))
sds(value = x$height, age = x$age, sex = x$sex, male = "m", female = "f",
    ref = who.ref, item = "height")