Why is the standard deviation defined using differences^2 instead of differences^4?
8860
Why square the difference instead of taking the absolute value in standard deviation?
32282
Why I am getting different $R^2$ from R LM and manual calculation?
81308
What is the reasoning behind standardization (dividing by standard deviation)?
93521
Why is the expected value (mean) of a variable written using square brackets?
19625
Difference between standard error and standard deviation
18564
Why is the symmetry variation $\delta_s q$ different from the ordinary variation $\delta q$?
154900
Why is $\pi$ = 3.14... instead of 6.28...?
132821
Why are floating point numbers printed so differently?
885
Why is the 2nd derivative written as $\frac{\mathrm d^2y}{\mathrm dx^2}$?
97782
Why are the domains for $\ln x^2$ and $2\ln x$ different?
18975
How to 'sum' a standard deviation?
146616
Why is the squared difference so commonly used?
84018
Why is there not a simpler way to calculate the standard deviation?
30283
What is the demonstration of the variance of the difference of two dependent variables?
99921
unknown standard deviation = range/4
37418
What is a standard deviation?
58541
What does standard deviation tell us in non-normal distribution