Purpose of Attribution Analysis in Portfolio Management

Jordan is managing a diversified equity portfolio for a client. At the end of the year, Jordan wants to evaluate the portfolio's performance to see if it met the client's expectations. To understand how much of the portfolio's return was due to selection of securities versus allocation to sectors, Jordan performs an attribution analysis.

Attribution analysis helps to identify the sources of return and assess whether performance is a result of skill or market movements. What is the primary purpose of conducting an attribution analysis for Jordan's portfolio?