For the automated monitoring of manufacturing yield a single sided "Runs rules" on decreasing n in a row AND continous number of samples n below target line is needed. Currently the only option we have in Statistica is this functionality for double sided problems, means increasing / decreasing AND below / above target line. this does not help since yield trend data are running to maximum 100%. So the best way to enable SPC for single sided data is to split up the Runs Rules on "Increasing/Decreasing trend" and "On the same side of center line"