Something like that. Ack. Also known as "rho", apparently.

>i think its the sum of squared item values divided by the number of items???
>
>>I'll try but I know the result is going to suck. Do you remember the calculation itself? I used to, but the STD() function spoiled me.
>>
>>
>>How about a cursor instead of an array....
>>>The Std Dev calculation is going to be a killer anyway..
>>>
>>>>I thought of that but this routine is called potentially hundreds of times in a single method call and the i/o would kill the app.
>>>>
>>>>>Why don't you take the contents of the array and jam it into a cursor?
>>>>>
>>>>>>Hi All.
>>>>>>
>>>>>>I'm in a bit of a problem here. I need to compute the standard deviation on an array of values. I know it's easy to do it on table data: CALCULATE STD(numfield). But what is the actual textbook formula? Anyone got a mathematics textbook handy or a darn good memory?