Calculates the D-score and DAZ for each visit — calculate

The function draw_chart() plots individual data on the growth chart.

Usage

calculate_dscore(
  txt = "",
  session = "",
  format = "3.1",
  append = c("ddi", "gs1"),
  output = c("table", "last_visit", "last_dscore"),
  loc = "",
  ...
)

Arguments

txt: A JSON string, URL, or file with BDS data in JSON format. Data should conform to the BDS JGZ 3.2.5 specification.
session: Optional session key if data is already uploaded to sitehost.
format: JSON schema version, e.g., "3.0". Used when uploading.
append: Optional vector of strings indicating which instrument to base D-score calculations on. Currently supports ddi and gs1. Requires JSON schema V3.0 or later.
output: A string, either "table", "last_visit" or '"last_dscore" specifying the result. The default "table" returns with columns: "date" (date), "x" (age), "y" (D-score) and "z" (DAZ). The number of rows equals to the number of visits. If output equals "last_visit" the function returns only the last row. If output equals "last_dscore" the function returns only the D-score from the last row.
loc: Deprecated. Use session instead.
...: Ignored

Value

A table, row or scalar.

Author

Stef van Buuren 2020

Examples

fn <- system.file("testdata", "Laura_S.json", package = "james")
df <- calculate_dscore(txt = fn)
head(df, 4)
#> [1] a   n   p   d   sem daz
#> <0 rows> (or 0-length row.names)