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Author: tytthus Big red star, 1000 posts Old School Fool Add to my Favorite Fools Ignore this person (you won't see their posts anymore) Number: of 76390  
Subject: Re: Calculating Personal Rate of Return Date: 3/14/2005 1:56 PM
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    date	purch pri	Numshare	value	cashin/out	return
01/31/04 104.54 0.9565716 $100.00 100
02/29/04 105.98 0.9435743 $201.38 100 1.01
03/31/04 104.01 0.961446 $297.63 100 0.98
04/30/04 102.37 0.9768487 $392.94 100 0.98
05/31/04 103.76 0.9637625 $498.28 100 1.01
06/30/04 105.41 0.9486766 $606.20 100 1.02
07/31/04 101.92 0.9811617 $686.13 100 0.97
08/31/04 102.31 0.9774216 $788.76 100 1.00
09/30/04 102.99 0.9709681 $894.00 100 1.01
10/31/04 104.55 0.9564802 $1,007.54 100 1.02
11/30/04 108.78 0.9192866 $1,148.30 100 1.04
12/31/04 111.64 0.8957363 $1,278.49 100 1.03

Time Weighted Rate of Return 6.79%
Annualized 7.43%

this is what i do (tailored to your numbers). i record the month end value of the portfolio, plus any cash additions or withdraws. the return calculation (final column) becomes: =+(month end value-cashin/out)/previous month end value.

then the time-weighted rate of return is the product of that entire column. you can get CAGR by doing this:

=POWER(Time weighted rateof return+1)/((ending date-begining date)/365.25))-1

not sure if this is exactly what you want....

best,
--morgan
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