Can someone please answer if this is ok? "(abs(X)) = 1/n sum(abs(Xi)), w/ i = 1..n"

johanonsjo

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Can someone please answer if this is ok? "(abs(X)) = 1/n sum(abs(Xi)), w/ i = 1..n"

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since X = 1/n sum(Xi), where i = 1..n

ex, n = 3, X = 1,2,3.

1+2+3 = 6, 6/3 = 2.

is it possible to write,

_____
(abs(X)) = 1/n sum(abs(Xi)), where i = 1..n

//abs = Absolute value.
Sum = Summation//
[h=1][/h]
[h=1][/h]
 
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since X = 1/n sum(Xi), where i = 1..n

ex, n = 3, X = 1,2,3.

It's confusing to use the same symbol X for two different things.

Instead of
X = 1,2,3, I think you meant:

X1 = 1
X2 = 2
X3 = 3

1+2+3 = 6, 6/3 = 2.

is it possible to write,

abs(X) = 1/n sum(abs(Xi)), where i = 1..n

It's okay to write that, as long as Xi remains non-negative. In such a case, Xi = |Xi|.

But, if any Xi is negative, then sum(Xi) sum(|Xi|) and you cannot write that. :cool:
 
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