Re: Random selection of 10%

[Charles Wilt <charles.wilt@xxxxxxxxx>]

I don't there's any need to know total number of cases...

Simply hard code a number between 1-10 into your code...
for each package generate a random number between 1 and 10.

If the numbers match, inspect that package.

You'll average a 10% inspection rate.

Charles


On Wed, Jan 30, 2013 at 4:36 PM, Nathan Andelin <nandelin@xxxxxxxxx> wrote:

> You'll need a random number generator that returns a number based on
> "from" and "to" parameters.
>
> Do you know the total number of "cases" per day? Can you identify each one
> sequentially? Do you need to generate a list of case sequence numbers?
>
> total_cases = 100;
> inspect_cases = total_cases / 10;
>
> for i = 1 to inspect_cases;
>  inspect_this = random(1:total_cases);
>  (store inspect_this somewhere)
> endfor;
>
> If your random() function ever returns a duplicate value, you'll need to
> discard it and decrement "i".
>
> -Nathan
>
>
>
> ----- Original Message -----
> From: Bill Reger <billr@xxxxxxxxxxxxxx>
> To: midrange-l@xxxxxxxxxxxx
> Cc:
> Sent: Wednesday, January 30, 2013 9:09 AM
> Subject: Random selection of 10%
>
> We would like to audit 10% of the Cases that flow down the shipping
> conveyor - checking that the contents of the Case matched what was
> (supposedly) packed.
>
> Now obviously we could count each Case and pull every 10th Case for audit.
> But it would not take long for someone to figure this out - and if they
> were so inclined - only short Cases other than the 10th in line.
>
> Is there an algorithm/logic that we could employ to randomly pull Cases
> that would equate to 10% over the course of a day but not be every 10th
> Case?  (My logic brain is on strike today and I can't think of a way to
> design this.)
>
> Bill
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