Calculates the recommended van Wiechen milestones based on age and past milestones

Usage

select_vwc(
  txt = "",
  p = 90,
  n = 6,
  session = "",
  format = "1.0",
  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.
p: Reference percentile indicating the expected probability of a positive van Wiechen outcome given child age. Higher values correspond with easier items.
n: Number of van Wiechen items to suggest. By default returns all items within set probability limits.
session: Optional session key if data is already uploaded to sitehost.
format: JSON schema version, e.g., "3.0". Used when uploading.
loc: Deprecated. Use session instead.
...: Ignored

Value

A string of milestones

Author

Arjan Huizing 2025

Examples

fn <- system.file("testdata", "Laura_S.json", package = "james")
select_vwc(txt = fn, p = 50, n = 10)
#>  [1] "ddifmd027" "ddigmm073" "ddifmd023" "ddifmd024" "ddicmm050" "ddifmd026"
#>  [7] "ddicmm047" "ddigmd074" "ddigmd075" "ddicmm048"