The iShares Russell Midcap Value Index ETF (Ticker: IWS) seeks investment results that, before fees and expenses, correspond generally to the performance the Russell Midcap Value Index, which is a style-set of the Russell Midcap Index. The 800 companies in the Russell Midcap Index are ranked by two variables: the Price-to-book ratio and the I/B/E/S forecast long-term growth mean. Variables are combined to create a composite value score (CVS) for each stock. Rank the stocks by their CVS and apply an algorithm to the distribution to determine style membership weights. 70% are classified as all value or all growth and 30% are weighted proportionately to both value & growth.