As my 2011 returns prove, my investment strategy is clearly superlative to any other...and therefore any comments otherwise are clearly either incorrect, or malicious in nature. Having said that, let me address two points:
"That is a difficult problem. I would recommend that you really don't incorporate the pricing of your contributions. BigJohn is probably talking about documenting and using the pricing of IFT transfers - at least the large(ish) ones. Trying to factor in all the salary contributions in any meaningful way would drive one nuts."
Boghie is correct, I use the price data from the date I move into a fund...and even though the value may fluctuate before I move out, I use the move in date price as a way of keeping it simple. Also, I always am either all in or all out...which makes my strategy a little easier to manage.
I agree with Boghie. In an IRA type account like the TSP, where taxes aren't a consideration, selling one day doesn't "lock in" a loss. Until you retire and pull you money out, the game continues to play.
We disagree, I consider it locking in a loss whenever I move out of a stock at a lower price than I bought in. I understand the impact of wild fluxuations between your buy in price and the date you want to sell...but again, I keep it simple while sacrificing some accuracy.
To those that haven't read my posts before (I have been gone a while), rest assured my opening line was in good fun.
Best of Luck
BigJohn