infinitybenzo

On a semi related note i have a question...

The formua:

Option Duration = (Delta)(Duration of Underlying)(Price Underlying / Price Option)

The sign of the delta in this case would be dependent upon the type of the option correct?

(+) for calls
(-) for puts

is this right?

and if so, is it the opposite when you're the seller of the option

i.e.,

(-) for calls
(+) for puts?