REFS is
a mine of invaluable information for the private investor.
Selecting shares without its help is like trying to
clap with one hand tied behind your back.
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Standard
deviation calculation
Standard deviation is a statistical measure of variance from the
mean value, and is known as the 'root mean square deviation'. The method of calculation
is demonstrated in a fully-worked
illustration. The standard deviation measures the degree to which individual
numbers tend to spread about their mean, or average, value. In statistical analysis,
it is accepted that for a given sample of measurements, two-thirds of the sample
normally fall within one standard deviation of the mean. For example, if there
are 18 estimates, it can be assumed that 12 of them lie within plus or minus one
standard deviation of the average.
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