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POStata: Identifying unique observations that differ on all variables, by group
 

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    <p>My Stata dataset contains observations on constituent components of products created by different players in a simulation. I would like to retain only the products (created by each player) that consist of distinct and unique components, i.e. identify the observations (by player_id) which differ on ALL variables. </p> <p>The data are:</p> <blockquote> <blockquote> <blockquote> <pre> +---------+-----------+------------+------------+------------+ | Product | Player id | Component1 | Component2 | Component3 | +---------+-----------+------------+------------+------------+ | 1 | 1 | 1 | 2 | 3 | | 2 | 1 | 1 | 5 | 9 | | 3 | 1 | 7 | 8 | 9 | | 4 | 2 | 4 | 5 | 6 | | 5 | 2 | 4 | 5 | 9 | | 6 | 2 | 7 | 8 | 9 | +---------+-----------+------------+------------+------------+ </pre> </blockquote> </blockquote> </blockquote> <p>The desirable outcome should allow me to have the following outcome:</p> <blockquote> <blockquote> <blockquote> <blockquote> <pre> +---------+-----------+------------+------------+------------+ | Product | Player id | Component1 | Component2 | Component3 | +---------+-----------+------------+------------+------------+ | 1 | 1 | 1 | 2 | 3 | | 3 | 1 | 7 | 8 | 9 | | 4 | 2 | 4 | 5 | 6 | | 6 | 2 | 7 | 8 | 9 | +---------+-----------+------------+------------+------------+</pre> </blockquote> </blockquote> </blockquote> </blockquote> <p>As one can see, Product 2 should be removed because it has common component 1 with product 1 and common component 3 with product 3; similarly product 5 should be removed because it shares components 1 and 2 with product 4, and component 3 with product 6.</p> <p>The remaining products (by player) should be kept because they draw on distinct non-overlapping components. </p>
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