Hi. Here is another link to an empirical 17 year study of PSAR...

Hi. Here is another link to an empirical 17 year study of PSAR versus other Technical Indicators on the S&P 500, which concluded, and I am paraphrasing here, 'PSAR method results domonstrate statistical significance at a 95% confidence level, and is far more adept at positioning a trader long or short, and by using the PSAR as the buy and sell signal, a trader will significantly outperform the market' which may or may not be of assistance to you. cheers

http://www.swdsi.org/swdsi2010/sw2010_preceedings/papers/pa153.pdf