Timing strategy for Metastock

[andrabr9]

I am having difficulties with this simple formula for metastock. I want to have a signal that could be used on the SPY 500...

Buy with these simple parameters...Entry


SPY>21 EXMA

SPY has risen 3.5% from the lowest point...

SPY> 200 EXMA


Sell ( Exit Long)


SPY<21 EXMA

SPY has fallen 3.5% from the highest point...



Greatly appreciate it...

Andy