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Illustration of Standard Deviation
The less spread out the numbers are, therefore smaller the standard deviation will be, as it is a way of determining the spread of the data. Similarly, the more spread out the numbers are, the bigger the standard deviation will be. For illustration here are two data sets which have similar number of values and also the similar mean, but the standard deviations are quite dissimilar:
>> x1 = [9 10 9.4 9.6];
>> mean(x1)
ans =
9.5000
>> std(x1)
0.4163
>> x2 = [2 17 -1.5 20.5];
>> mean(x2)
>> std(x2)
10.8704
Illustration of Advanced file input and output: For illustration, to refer to the third number in the first element of the cell array: >> subjdata{1}(3) ans =
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