Function to create Knots and Boundaries from supplied data in LONG format.

createKnotsBoundaries(tmp.data,
         knot.cut.percentiles=c(0.2,0.4,0.6,0.8))

Arguments

tmp.data	Data supplied to function in LONG format. See sgpData_LONG for an exemplar. tmp.data must contain, at least, variables 'VALID_CASE', 'CONTENT_AREA', 'SCALE_SCORE', 'GRADE'.
knot.cut.percentiles	A numeric vector of quantiles of 'SCALE_SCORE' to be used as the cut points. Default is to use the 20th, 40th, 60th, and 80th percentiles (i.e., c(0.2,0.4,0.6,0.8)).

Value

Returns a list containing Knots, Boundaries and Loss/Hoss scores.

Examples

not_run({
  ### Run on supplied long data

  DEMO_Knots_Boundaries <- createKnotsBoundaries(sgpData_LONG)

  ### Run as part of prepareSGP

  ### First NULL out knots and boundaries embedded in SGPstateData

  SGPstateData[["DEMO"]][["Achievement"]][["Knots_Boundaries"]] <- NULL
  Demonstration_SGP <- prepareSGP(sgpData_LONG)
})