Function reference
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          Neary2004
- Population, Prices, and Quantities for 60 countries (1980).
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          ccd()
- CCD (Caves, Christensen, and Diewert) index
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          eks()
- EKS quantity index
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          gk()
- Gheary Khamis world prices and quantity index
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          p_fisher()
- Fisher ideal price index.
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          p_laspeyre()
- Laspeyre price index.
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          p_paasche()
- Paasche price index.
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          pgk()
- Geary Khamis world prices
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          q_fisher()
- Fisher ideal quantity index.
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          q_laspeyre()
- Laspeyre quantity index.
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          q_paasche()
- Paasche quantity index.
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          q_tornqvist()
- Törnqvist quantity index.
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          ygk()
- Geary Khamis quantity index