| 1. | The surveys are released shortly after the end of the reference period.
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| 2. | Each index measures price changes from a reference period defined to equal 100.0.
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| 3. | The reference period for a sampling frame is generally the most recent available 12 months.
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| 4. | Marine operations with a reference period less than 72 hours can be defined as weather-limited operations.
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| 5. | Early articles on Wikipedia had no references period.
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| 6. | The restorations made in the 20th century used the end of the 17th century as a reference period.
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| 7. | The EU head office also proposes to alter the " reference period " used to calculate a 48-hour workweek.
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| 8. | If unforeseen time has not been identified, the operation reference period is normally set at twice the estimated operation time.
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| 9. | The index reference period, usually called the base year, often differs both from the weight-reference period and the price reference period.
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| 10. | The index reference period, usually called the base year, often differs both from the weight-reference period and the price reference period.
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