as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
what is the peg ratio? how is the peg ratio calculated? how is the peg ratio useful for stock investing?
user
peg is price to earnings growth.  i've forgotten how it's calculated, i just remember that a peg ratio of 1-2 is attractive by graham & dodd standards.
assistant