See related link. You can use Excel, if you dataset is not too big. Generally, if I have a table of data, with n columns corresponding to n variables with N observations, I can calculate the covariance of columns a and b, using excel covar function, covar(range of first data values, range of second data values) To keep things organized, you may want to name the ranges of your columns and use them as the arguments in the covar.
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what should a security plan address
Probability and Severity are the two factors determine the risk level in the Risk Assessment Matrix.
risk matrix is a 2*2 table (high,low) or 3*3(high,medium,low) showing the impact of risk on vertical lines and showing probability of the event happening,giving rise to risk,on horizontal lines.in this way you can show your risks in a digram so more understandable in a grid...risk profile is the level of risk an organization is able to accept
This years' sales plus last years' sales divided by 2
(0.6745 * Standard deviation)/ (n^1/2) :)