16+-+Introduction+to+Correlated+and+Longitudinal+Data.pdf - Introduction to Correlated and Longitudinal Data Analysis ZACHARY BINNEY DECEMBER 2018 What

16+-+Introduction+to+Correlated+and+Longitudinal+Data.pdf -...

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Introduction to Correlated and Longitudinal Data Analysis ZACHARY BINNEY DECEMBER 2018
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What Is Correlated Data? EXAMPLE: MUSIC CHOICES WHY CORRELATED DATA IS A PROBLEM
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Distribution of Genre Of Your Favorite Songs Music Type Pr(Song) Pop/Rock 42% Rap/Hip-Hop 21% Country 12% Other 25%
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Everybody quietly think of a song. Any song. Scribble the name down. Quick, somebody, yell out the first song that comes into your head! Okay, quick, now somebody else from the other side of the room! Somebody else random! Now me! Independence Assumption: the song the first person shouted out didn’t affect the second song that was a shouted out… …which didn’t affect the third… …which didn’t affect my choice. This playlist is independent data Classic Regression Assumption: Independent Data Music Type Pr(Song) Pop/Rock 42% Rap/Hip-Hop 21% Country 12% Other 25%
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Let’s take our first song… …and build a playlist with it. Pandora break! What’s our playlist look like? Correlated data : the first song tells us a lot about the second song, third song, etc. Correlated Data: Pandora/Spotify Music Type Pr(Song) Pop/Rock 42% Rap/Hip-Hop 21% Country 12% Other 25%
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What’s a public health study analogue for our first playlist? What’s a public health study analogue for our second playlist? Correlated Data: Public Health Source: ; - primary-data-collection/random-sampling/
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