Subject: Re: Random selection of 10% From: Charles Wilt Date: Wed, 30 Jan 2013 17:17:26 -0500 List-archive: List-help: List-id: Midrange Systems Technical Discussion List-post: List-subscribe: , List-unsubscribe: ,

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

-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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