growthcleanr (version 2.2.0)

sd_median: Calculate median SD score by age for each parameter.

Description

Calculate median SD score by age for each parameter.

Usage

sd_median(param, sex, agedays, sd.orig)

Value

Table of data with median SD-scores per day of life by gender and parameter.

Arguments

param

Vector identifying each measurement, may be 'WEIGHTKG', or 'HEIGHTCM'.

sex

Vector identifying the gender of the subject, may be 'M', 'm', or 0 for males, vs. 'F', 'f' or 1 for females.

agedays

Numeric vector containing the age in days at each measurement.

sd.orig

Vector of previously calculated standard deviation (SD) scores for each measurement before re-centering.

Examples

# Run on 1 subject
df_stats <- as.data.frame(syngrowth)
df_stats <- df_stats[df_stats$subjid == df_stats$subjid[1], ]

# Get the original standard deviations
measurement_to_z <- read_anthro(cdc.only = TRUE)
sd.orig <- measurement_to_z(df_stats$param,
                       df_stats$agedays,
                       df_stats$sex,
                       df_stats$measurement,
                       TRUE)

# Calculate median standard deviations
sd.m <- sd_median(df_stats$param,
                  df_stats$sex,
                  df_stats$agedays,
                  sd.orig)