createKnotsBoundaries

Data supplied to function in LONG format. See sgpData_LONG for exemplar. tmp.data must contain, at least, variables 'VALID_CASE', 'CONTENT_AREA', 'SCALE_SCORE', 'GRADE'

tmp.data

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)).

knot.cut.percentiles

The function createKnotsBoundaries creates Knots, Boundaries and Loss/Hoss scores for subsequent use and embedding in SGPstateData.

documentation

Functions to calculate student growth percentiles and
        percentile growth projections/trajectories for students using
        large scale, longitudinal assessment data.  Functions use
        quantile regression to estimate the conditional density
        associated with each student's achievement history.  Percentile
        growth projections/trajectories are calculated using the
        coefficient matrices derived from the quantile regression
        analyses and specify what percentile growth is required for
        students to reach future achievement targets.

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

Description

Usage

Arguments

Value

Examples