Finance: Beta

haha..
2:30 "to calculate beta you need this big computer.."
haha
beta= ratio of st. dev on your stock under consideration to st dev of major index (proxy for mkt) times coeff. corr between rates of return on your stock relative to rates of retrun on your market proxy say: S&P 500 , or better NYSE (2000 stocks)
anyway
or just Cov bet stok and mrk, diveded by variance of mkt
simple as that .. no computers no nothing, hahaha
though it's a cool video
really funny one
thank you
r.

at 0:28 it is written you can..but it shoul be:

At a certain point you CAN'T diversify your portfolio's risk away.

very simple but effective

nice

Thanks

its help