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Why do some of the frequencies or percents jump around so much between years when they have relatively large numbers?

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Why do some of the frequencies or percents jump around so much between years when they have relatively large numbers?

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The large jumps in frequencies and percents in some categories between years is due to the over sampling and weighting methods that the data goes through. For more information about the sampling and weighting techniques please see the About PRAMS page.

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