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.
In this article, we will look at how the volatility can be calculated using excel. We will take the historical data for S&P 500 for the past three months and use the data to calculate the volatility. Step 1: Get the Data. We have downloaded the price data for S&P500 in a spreadsheet. The data contains many things such as Close, Open, High, Low, and %change.