Ranking: Difference between revisions
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==Metrics== | ==Metrics== | ||
See https://medium.com/swlh/rank-aware-recsys-evaluation-metrics-5191bba16832 | |||
===Cumulative Gain=== | ===Cumulative Gain=== | ||
Suppose you have a list of results <math>x_1,..., x_n</math> with relevency <math>r_1,...,r_n</math>.<br> | Suppose you have a list of results <math>x_1,..., x_n</math> with relevency <math>r_1,...,r_n</math>.<br> | ||
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\end{equation} | \end{equation} | ||
</math> | </math> | ||
===Mean Reciprocal Rank=== | |||
{{main | Wikipedia: Mean reciprocal rank}} | |||
If you only have one correct answer which is placed in rank <math>i</math> then the reciprocal rank is <math>1/i</math>.<br> | |||
For multiple queries and results, the mean reciprocal rank is simply <math>\mean(1/rank)</math>. | |||