Fix R Warning: aggregate function missing

This warning occurs when you use the dcast function to convert a data frame from long to wide format, but more than one value can be placed in the individual output cells of the wide data frame. You can stop this warning from occurring by specifying the aggregate...

How to Calculate Implied Volatility in R

Implied volatility tells us the expected volatility of a stock over an option’s lifetime. Implied volatility is directly influenced by the supply and demand of the options and the market’s expectation of the direction of the price of the underlying...