Puzzled by the "Variance"
- To: mathgroup at smc.vnet.net
- Subject: [mg86506] Puzzled by the "Variance"
- From: Elements <philyer at gmail.com>
- Date: Wed, 12 Mar 2008 05:29:07 -0500 (EST)
Greeting all I'm puzzled by the function "Variance". We can learn how to calculate variance from this page:http://mathworld.wolfram.com/SampleVariance.html. For example, calculate the sample variance of {1,2,3}. the average of {1,2,3} is 2, then the variance should be ((1-2)^2+(2-2)^2+(3-2)^2)/3=2/3. But mathematica gives that: In[10]:= Variance[{1.0,2.0,3.0}] Out[10]= 1. Why?? -- Best Wishes! Yours Sincerely
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