Functions in the SGP package are issued under two different licenses:

  o bubblePlot and studentGrowthPlot are issued under CC BY-NC-SA 3.0: http://creativecommons.org/licenses/by-nc-sa/3.0/us/
  o All other functions are issued under CC BY-SA 3.0: http://creativecommons.org/licenses/by-sa/3.0/us/

In particular note that the bubblePlot and studentGrowthPlot functions are NOT to 
be used for any commericial purpose. This restriction does not apply to the other functions.

Use of this package for any purpose requires attribution: 

Damian W. Betebenner (2011). 
SGP: An R Package for the Calculation and Visualization of Student Growth Percentiles. 
http://cran.r-project.org/web/packages/SGP/
http://sgp.r-forge.r-project.org/
