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What does PSD stand for?

PSD stands for period standard deviation

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The spreadsheet above shows an example for a 10-period standard deviation using QQQQ data. Notice that the 10-period average is calculated after the 10th period and this average is applied to all 10 periods. Building a running standard deviation with this formula would be quite intensive. Excel has an easier way with the STDEVP formula. The table below shows the 10-period standard deviation using this formula.
The calculation of the Standard Deviation can be accomplished in six steps. For example, to calculate a 10-period standard deviation.
<P>Standard Deviation&nbsp;- Definition for&nbsp;Standard Deviation from Morningstar -&nbsp;This statistical measurement of dispersion about an average, depicts how widely a mutual fund's returns varied over a certain period of time.</P>