Historically speaking

How is historical trading-day volatility measured?

Step 1:
A) Calculate the absolute change in closing prices as the data set.
B) Calculate the percentage change in closing prices as the data set.

Step 2:
C) Calculate the standard deviation of the data set.
D) Calculate the variance of the data set.

Step 3:
E) Multiply it by \( \sqrt{ 260} \).
F) Multiply it by \( \sqrt{365} \).

Image credit: Google Finance
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