Here is a bit more data ... shows outliers.
Ex. purchased I fund on Oct 26, 2008 and sold it on Nov 8, 2008.
The closing TSP price for I was 12.0689 on Oct 26 and $14.2075 on Nov 8, 2008. $14.2075/12.0689 = 17.72 % increase in your investment for that buy/sell transaction. Please let me know if there is a flaw in this logic. Thx DB Annie
[TABLE="width: 624"]
[TR]
[TD="class: xl79, width: 64, bgcolor: #FFFFCC"]
YEAR[/TD]
[TD="class: xl75, width: 73, bgcolor: #E4DFEC"]
Purchase Date[/TD]
[TD="class: xl76, width: 57, bgcolor: #E4DFEC"]
Fund Purchased[/TD]
[TD="class: xl77, width: 84, bgcolor: #FDE9D9"]
Sale Date [/TD]
[TD="class: xl78, width: 67, bgcolor: #FDE9D9"]
Fund Sold [/TD]
[TD="class: xl87, width: 61, bgcolor: #EBF1DE"]
ORIGINAL METHOD [/TD]
[TD="class: xl85, width: 69, bgcolor: transparent"]
TSP DATA - DATE[/TD]
[TD="class: xl85, width: 89, bgcolor: transparent"]
G[/TD]
[TD="class: xl85, width: 74, bgcolor: transparent"]
F[/TD]
[TD="class: xl85, width: 64, bgcolor: transparent"]
C[/TD]
[TD="class: xl85, width: 64, bgcolor: transparent"]
S[/TD]
[TD="class: xl86, width: 64, bgcolor: transparent"]
I[/TD]
[/TR]
[TR]
[TD="bgcolor: transparent, align: right"]
2008[/TD]
[TD="class: xl71, bgcolor: transparent, align: right"]
26-Oct[/TD]
[TD="class: xl65, bgcolor: transparent"]
I[/TD]
[TD="class: xl67, bgcolor: transparent, align: right"]
8-Nov[/TD]
[TD="class: xl82, bgcolor: yellow"]
I[/TD]
[TD="class: xl89, bgcolor: yellow"]
17.72%[/TD]
[TD="class: xl71, bgcolor: transparent, align: right"]
26-Oct[/TD]
[TD="bgcolor: transparent, align: right"]
12.666[/TD]
[TD="bgcolor: transparent, align: right"]
11.8262[/TD]
[TD="bgcolor: transparent, align: right"]
9.7438[/TD]
[TD="bgcolor: transparent, align: right"]
11.0751[/TD]
[TD="class: xl80, bgcolor: yellow, align: right"]
12.0689[/TD]
[/TR]
[TR]
[TD="bgcolor: transparent, align: right"]
2008[/TD]
[TD="class: xl71, bgcolor: transparent, align: right"]
8-Nov[/TD]
[TD="class: xl65, bgcolor: transparent"]
F[/TD]
[TD="class: xl67, bgcolor: transparent, align: right"]
20-Nov[/TD]
[TD="class: xl65, bgcolor: transparent"]
F[/TD]
[TD="class: xl88, bgcolor: transparent"]
0.44%[/TD]
[TD="class: xl71, bgcolor: transparent, align: right"]
8-Nov[/TD]
[TD="bgcolor: transparent, align: right"]
12.6801[/TD]
[TD="bgcolor: transparent, align: right"]
11.9223[/TD]
[TD="bgcolor: transparent, align: right"]
10.7031[/TD]
[TD="bgcolor: transparent, align: right"]
12.4456[/TD]
[TD="class: xl80, bgcolor: yellow, align: right"]
14.2075[/TD]
[/TR]
[TR]
[TD="bgcolor: transparent, align: right"]
2008[/TD]
[TD="class: xl71, bgcolor: transparent, align: right"]
20-Nov[/TD]
[TD="class: xl65, bgcolor: transparent"]
S[/TD]
[TD="class: xl67, bgcolor: transparent, align: right"]
3-Dec[/TD]
[TD="class: xl82, bgcolor: yellow"]
S[/TD]
[TD="class: xl89, bgcolor: yellow"]
18.63%[/TD]
[TD="class: xl71, bgcolor: transparent, align: right"]
20-Nov[/TD]
[TD="bgcolor: transparent, align: right"]
12.6972[/TD]
[TD="bgcolor: transparent, align: right"]
11.9749[/TD]
[TD="bgcolor: transparent, align: right"]
8.6601[/TD]
[TD="class: xl80, bgcolor: yellow, align: right"]
9.425[/TD]
[TD="bgcolor: transparent, align: right"]
11.4821[/TD]
[/TR]
[TR]
[TD="bgcolor: transparent, align: right"]
2008[/TD]
[TD="class: xl71, bgcolor: transparent, align: right"]
3-Dec[/TD]
[TD="class: xl65, bgcolor: transparent"]
C[/TD]
[TD="class: xl68, bgcolor: transparent, align: right"]
23-Dec[/TD]
[TD="class: xl65, bgcolor: transparent"]
C[/TD]
[TD="class: xl88, bgcolor: transparent"]
-0.77%[/TD]
[TD="class: xl71, bgcolor: transparent, align: right"]
3-Dec[/TD]
[TD="bgcolor: transparent, align: right"]
12.7136[/TD]
[TD="bgcolor: transparent, align: right"]
12.2147[/TD]
[TD="bgcolor: transparent, align: right"]
10.032[/TD]
[TD="class: xl80, bgcolor: yellow, align: right"]
11.1811[/TD]
[TD="bgcolor: transparent, align: right"]
12.9203[/TD]
[/TR]
[TR]
[TD="bgcolor: transparent, align: right"]
2008[/TD]
[TD="class: xl73, bgcolor: transparent, align: right"]
23-Dec[/TD]
[TD="class: xl74, bgcolor: transparent"]
I[/TD]
[TD="class: xl81, bgcolor: #F2DCDB, align: right"]
3-Jan[/TD]
[TD="class: xl74, bgcolor: transparent"]
I[/TD]
[TD="class: xl88, bgcolor: transparent"]
7.16%[/TD]
[TD="class: xl73, bgcolor: transparent, align: right"]
23-Dec[/TD]
[TD="bgcolor: transparent, align: right"]
12.7329[/TD]
[TD="bgcolor: transparent, align: right"]
12.5474[/TD]
[TD="bgcolor: transparent, align: right"]
9.9545[/TD]
[TD="bgcolor: transparent, align: right"]
11.5214[/TD]
[TD="bgcolor: transparent, align: right"]
13.5765[/TD]
[/TR]
[/TABLE]