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RE: [Fathom] Switching babies
Posted:
Oct 17, 2004 7:05 AM


David,
I think if you put make a collection with four cases in the first column called x. Just make the formula random() and it will pick four random values in the zeroone range
and then in column two "baby" use the formula rank(x) and it will assign each mother a baby.
Then make a variable called "rightbaby" using the formula if (caseindex=baby){1,0} and it will have a one for each right baby, and a zero for each wrong baby..
Now collect a measure called "numright" and make the formula sum(rightbaby) Now resample lots of times and make a graph of how many times each result appears.
I once wrote a similar thing for the ti82 (long time ago) to solve the same problem talking about returning hats... For this interested it is at the very bottom of http://www.pballew.net/#TI82 look for the ten hats
Hope that works... If you have trouble, send me a note off list and I will send an attachment.
Pat Ballew Lakenheath, UK
MathWords http://www.pballew.net/etyindex.html
Original Message From: ownerfathom@mathforum.org [mailto://ownerfathom@mathforum.org] On Behalf Of David Arnold Sent: Sunday, October 17, 2004 7:33 AM To: fathom@mathforum.org Subject: [Fathom] Switching babies
All,
There's a nice example in Workshop statistics. Four mothers have a baby in the hospital. If the babies are returned to their mothers at random, what can happen?
The idea involves permuations, where the order of selection is important. So, 1234 could represent that the first mom got baby 1, the second mom baby 2, the third mom baby 3, and the fourth mom baby 4. Let this represent the fact that all the moms got the correct baby.
Further, the permutation 1243 would represent the fact that the first two moms got the correct baby, but the third and fourth moms had their babies switched.
Can anyone share some ideas on how to simulate this in Fathom?
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