^{The major indexes that track the closest to the TSP funds are below:} 

SPY = C-fund	DJIA = S-fund	EFA = I-fund
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TNX = Inverse to F-fund		VIX = Inverse to Overall Market
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The government Thrift Savings Plan  TSP site updates the fund closing prices every day usually between 8 and 9 o'clock PM EST. you can copy these numbers into an excel spreadsheet (I use this one, try it out) and use the graphing tool to see how each fund is performing graphically. As you can see below, most of the funds trend similar in nature.
All TSP Fund Graphs Comparison

^{See for more insights into what drives the funds.}

^{Want Advise try one of the many TSP advisory services listed on the
Thrift Savings Plan Reference Sites page.}

^{If you want to learn how to forecast your own accounts.; Learn Elliott wave and Fibinacci retracement techniques and use my Fibinacci calculator to predict maximum gains on long trends and individual cycles.}

^{Also see for books that can teach you how to forcast trending markets.}