Damian W. Betebenner <dbetebenner@nciea.org>,
with contributions from Jonathan Weeks, Jinnie Choi, Marie Huchton, Xin Wei, and Hi Shin Shim
Functions to calculate 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 students 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.

Student Growth Percentile and Percentile Growth
Projection/Trajectory Functions
R (>= 2.7.0), splines, quantreg, grid, gtools
Damian W. Betebenner <dbetebenner@nciea.org>, with
contributions from Jonathan Weeks, Jinnie Choi, Marie Huchton,
Xin Wei, and Hi Shin Shim
Functions to calculate 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 students 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.

R (>= 2.7.0), splines, quantreg, grid, gtools, data.table,
reshape
Damian W. Betebenner <dbetebenner@nciea.org>, with
contributions from Adam Van Iwaarden, Jonathan Weeks, Jinnie
Choi, Marie Huchton, Xin Wei, and Hi Shin Shim
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.