What we're talking about is intraday volatility. You have to quantify what you mean by "super choppy." In what time frame? If from 10-11am the standard deviation is, say, $0.25, would you call that "super-choppy?" For SIRI, that's super-choppy; for FB, that typical, and some would even call it "smooth."
The key is to establish a baseline for the financial instrument in question, and then make decisions from there. If we agree that "smooth" means a standard deviation of $0.05 over time t, and over another period of time t the standard deviation is $0.25, then it's "super-choppy."
Something like this: let's say that a baseline intraday volatility is $0.10 over time t. Then the following makes sense:
Code:
STD LABEL
0.01 dead
0.05 smooth
0.10 baseline
0.15 choppy
0.20 really choppy
0.25 super-choppy
Assuming a period time t = 10 minutes, we can say things like this:
10:00-10:09am: smooth
10:10-10:19am: choppy
10:20-10:29am: dead
10:30-10:39am: super-choppy
10:40-10:49am: smooth
10:50-10:59am: downspike
Also it's important to note that, although the volatility figure may be the same, the actual chart can be radically different. The following two have about the same standard deviation over the same amount of time, and number of data points:
Code:
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o o
o o
o o
o o
o o o o
o
o
o
o
o
Simply put, it's not so easy what you're asking for. I've been noodling on this for a few days now.