Vanguard Mid-Cap Value ETF(AMEX:VOE)

The fund passively provides exposure to the broad US mid-cap value market. It doesn't stray into small-caps as many peer funds do, although it may emphasize different sectors. The underlying index is constructed using a multi-factor model that classifies value securities in the mid-cap market based on book-to-price, forward earnings-to-price, historic earnings-to-price, dividend-to-price ratio, and sales-to-price ratio. Securities are scored and ranked based on the composite of these five factors, which is also the basis for their weighting. The index is fully reviewed on a quarterly basis.