sds_2d: Calculate SDS Values for 2-dimensional matrix of covariates

In childsds: Data and Methods Around Reference Values in Pediatrics

Calculate SDS Values for 2-dimensional matrix of covariates

Description

Calculate SDS values for 2-dimensional matrix of covariates

Usage

sds_2d(
  value,
  age,
  x2,
  sex,
  item,
  ref,
  type = "SDS",
  male = "male",
  female = "female"
)

Arguments

value	vector of measurement values
age	vector of age values
x2	second vector of covariates
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 male

Details

The function takes a vector of measurement values, and of age and a second covariate (like age and height for blood pressure) of sex and a RefGroup object as arguments. It calculates the sds or percentile values. This function is beta.

the function searches for the nearest given point in the reference grid. From there, the SDS/percentile value will be calculated. Different from sds, no interpolation will be applied. The procedure is according to Neuhauser et al. Blood Pressure Percentiles by Age and Height from Nonoverweight Children and Adolescents in Germany. 2011.

Value

vector containing SDS or percentile values

Author(s)

Mandy Vogel

childsds documentation built on March 18, 2022, 7:55 p.m.