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I used a four year simple moving average (SMA) of BRK price (four years because Jim used 16 quarters
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where 'SMA' is a simple moving average of BRK price over the past four years.
Yahoo historical only gives daily, weekly, and monthly. Not yearly.
So how did you do it? Just take the average of the last four December closing prices? Daily average of the last 4 years?
If/when I attempt to redo your interesting table, I'd be inclined to do monthly, maybe the last 48 months closing prices.
