Black-Scholes converted for Binomial Tree

Description
This model enables you to convert an annualized standard deviation in the Black-Scholes model to get up and down movements in the binomial tree.

Needed inputs:
- Annualized Standard deviation
- Riskless rate
- Dividend yield
- Number of periods each year

- Value of option today

Note: this model is being shared with the authorization of Professor Aswath Damodaran from NYU Stern Business School (www.damodaran.com)