Most country funds, like other index funds, are market-weighted, meaning their exposure to different stocks is based on the total value of the stocks' shares outstanding in comparison with the market capitalization of other shares in that market.

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But that data needs treating with caution. uSwitch, a comparison site that compiled the figures, says the data is based on sales plus deal popularity.

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For an apples-to-apples comparison of network programs of differing lengths, the series are ranked based on ad revenue per average 30 minutes.

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See Figure 1 for a comparison of both variants of Case-Shiller and their corresponding analogues based on the Zillow Home Value Index.

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To create a basis for comparison, MetroPCS is assumed to be included for the full 2013 financial year based on a pro forma calculation.

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