If strep bacteria causes the infection, it can remain contagious for up to 2 weeks without treatment. However, antibiotics can shorten the contagious period and li â¦ mits to about 24 to 48 hours once the therapy starts.     http://health.top54u.com/post/How-Long-is-Tonsillitis-Contagious.aspx.
Calculate Options Implied Volatility in Excel. Implied Volatility Function: Returns the annualized volatility of an underlying security implied by the market price of a European call or put option on that security, based on Black-Scholes valuation. Description of parameters.
So why is volatility so important to options traders? First off, volatility is the measure of the variation of a financial instrument over time. In other words, itâs a metric for measuring how much a stock or option (or something else) moves over a certain period of time. The higher the volatility, the more the instrument moves on average.