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Extended-Hours Data Changes Parabolic SAR

This week, I have been using both E-Trade Pro and thinkorswim (TD Ameritrade's software) to chart the stock market. I noticed that the Parabolic SAR on E-Trade looks drastically different than TD Ameritrade's data. I've provided some screen shot below for comparison.

This first screen shot is from E-Trade Pro.

Attached Image:

SCO E-Trade Pro Chart.png

Fri, 23 Oct 2015 00:10:41 -0700

This second screen shot is from thinkorswim (TOS).

Attached Image:

SCO thinkorswim Chart.png

Fri, 23 Oct 2015 00:11:43 -0700

Note that E-Trade Pro has a nice smooth curve on the third column, which is actually Monday, Oct 19. (There is a bug in E-Trade Pro, where after midnight, it pushes the day label left, but doesn't push the chart left.)

On the TOS chart, the second column, which is Monday, Oct 19, the Parabolic SAR is choppy.

After scratching my head for a few days, I finally figured out the discrepancy between the two software. TOS display extended trade session data by default, which changes the Parabolic SAR values. You can disable the extended trade session data by going into "Chart Settings" and disabling "Show Extended-Hours Trading session" (see screen shot below).

Attached Image:

Chart Settings.png

Fri, 23 Oct 2015 00:19:54 -0700

After you do that, you'll see a chart similar to the E-trade Pro chart (see screen shot below).

Attached Image:

thinkorswim Chart without Extended Sessions.png

Fri, 23 Oct 2015 00:22:52 -0700

Interesting enough, the two chart are just slightly different. But the thinkorswim chart is identical to the chart on E-Trade's web site (see screen shot below).

Attached Image:

SCO Chart on E-Trade Site.png

Fri, 23 Oct 2015 00:25:30 -0700

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