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Spot-futures pricing model (with time to maturity and volatility)

I am looking for price model for spot and futures Maybe you can recommend something intresting? Price can include (time until expiration) and volatility in spot,price of spot What i should looking for?

Maybe books which can describe correlation between spot and futures?

Something like this paper "Time-Varying Spot and Futures Oil Prices Dynamics"  
http://www.brunel.ac.uk/__data/assets/pdf_file/0015/82032/1006.pdf

HOW futures become equal to spot price.  
http://www3.cs.stonybrook.edu/~skiena/691/2007/lectures/lecture3.pdf  
F=S*EXP(r*T) where F -forwad price S price for basic(for example stock or commodities oil) T-time period  
But i am looking for price model near time expiration(maturity of futures) wheref tures price almost equal to spot price and will be soon(after few hors,day) equal to spotprice)


http://www.investopedia.com/ask/answers/06/futuresconvergespot.asp  
Why do futures' prices converge upon spot prices during the delivery month? (i need formula for this)




Relationship between the price volatility and the time- to-maturity of a futures contract Futures price

What i should read,what you can recommend for price models of futures and spot?(like Black Scholes but for spot-futures only) What quants use for modeling futures price Maybe some R packages?