%%just use linear regression and you get an ok estimate.
OK;
i seldom look @ that LR or PSAR [parabolic stop + reverse, aka= parabolic time price]
I also seldom look @ PE on qqq. I did sell all my UDOW late this week.
LR on monthly charts may sell in FEB or MAR/SPY, but they tend to sell then no matter what PSAR or LN says.............................................................. Trend=friend