Is the mean variance a standard deviation? -- The variance is the mean variance, but the standard deviation is not the mean variance. The interpretation of the standard deviation of 99% on the network is incorrect.

Searching on the Internet and finding an explanation of the standard deviation or mean deviation, almost 99% means that the two are one thing.

 

Mean variance, mean variance. From the name, there is no square root here. Why is it a standard deviation?

Is it true that some of our textbooks are completely confused?

 

Mean Squared Error
,
Or Mean Square Deviation

Http://en.wikipedia.org/wiki/Mean_squared_error

Http://planetmath.org/encyclopedia/MeanSquareDeviation.html

Http://dictionary.reference.com/browse/mean+square+deviation

 

Variance)

:

Http://en.wikipedia.org/wiki/Variance

 

 

Standard deviation (root mean deviation) (rmsd )(

Standard Deviation

, Or
Root-mean-square deviation


)

Http://en.wikipedia.org/wiki/Root_mean_square_deviation

Http://en.wikipedia.org/wiki/Standard_deviation

 

 

From the detailed explanations and formulas in the above join, we can see that variance and MSE are a concept under some common conditions. But they are not standard deviations.