X4 is being subtracted, not added.
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Sent from my phone. Please excuse my brevity.
On August 29, 2015 5:24:55 PM PDT, David Winsemius <dwinsem...@comcast.net>
wrote:
>
>On Aug 29, 2015, at 11:35 AM, Shant Ch via R-help wrote:
>
>> Hello Dr. Berry,
>>
>> I know the theoretical side but note we are not talking about
>expectation of sums rather expectation of ABSOLUTE value of the
>function (X1/3+X2/3+X3/3-X4), i.e. E|X1/3+X2/3+X3/3-X4| , I don't
>think this can be handled for log normal distribution by integrals by
>hand.
>>
>
>To Shnant Ch;
>
>I admit to puzzlement (being a humble country doctor). Can you explain
>why there should be a difference between the absolute value of an
>expectation for a sum of values from a function, in this case dlnorm,
>that is positive definite versus an expectation simply of the sum of
>such values?
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