Analysis, stratified estimation

Tool for stratified estimation of accuracy and area for an arbitrary
number of map categories. For more information, please refer to:
Olofsson, P., Foody, G. M., Stehman, S. V., & Woodcock, C. E. (2013).
Making better use of accuracy data in land change studies: Estimating
accuracy and area and quantifying uncertainty using stratified
estimation. Remote Sensing of Environment, 129, 122-131.