A small independent stock broker has created four sector portfolios for her clients. Each portfolio always has

Question:

A small independent stock has created four sector portfolios for her clients. Each always has five that may change from year to year. The volatility (coefficient of variation) of each stock is recorded for each year. Are the main effects significant? Is there an interaction?

A small independent stock broker has created four sector portfolios

Stocks
Stocks or shares are generally equity instruments that provide the largest source of raising funds in any public or private listed company's. The instruments are issued on a stock exchange from where a large number of general public who are willing... Broker
A broker is someone or something that acts as an intermediary third party, managing transactions between two other entities. A broker is a person or company authorized to buy and sell stocks or other investments. They are the ones responsible for... Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...