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?