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  2. Count-distinct problem - Wikipedia

    en.wikipedia.org/wiki/Count-distinct_problem

    In computer science, the count-distinct problem [1] (also known in applied mathematics as the cardinality estimation problem) is the problem of finding the number of distinct elements in a data stream with repeated elements. This is a well-known problem with numerous applications.

  3. Determining the number of clusters in a data set - Wikipedia

    en.wikipedia.org/wiki/Determining_the_number_of...

    The average silhouette of the data is another useful criterion for assessing the natural number of clusters. The silhouette of a data instance is a measure of how closely it is matched to data within its cluster and how loosely it is matched to data of the neighboring cluster, i.e., the cluster whose average distance from the datum is lowest. [8]

  4. Cluster analysis - Wikipedia

    en.wikipedia.org/wiki/Cluster_analysis

    Cluster analysis or clustering is the task of grouping a set of objects in such a way that objects in the same group (called a cluster) are more similar (in some specific sense defined by the analyst) to each other than to those in other groups (clusters).

  5. Element distinctness problem - Wikipedia

    en.wikipedia.org/wiki/Element_distinctness_problem

    Elements that occur more than / times in a multiset of size may be found by a comparison-based algorithm, the Misra–Gries heavy hitters algorithm, in time (⁡). The element distinctness problem is a special case of this problem where k = n {\displaystyle k=n} .

  6. It's the end of the road for these cars: Models that won't ...

    www.aol.com/news/end-road-cars-models-wont...

    A number of car models won't ring in the new year. The Ford Edge, Toyota Venza and Mini Clubman are just some of the vehicles that won't make it past model year 2024 in U.S. markets.

  7. Teen escapes 12 years after abduction; school bus driver arrested

    www.aol.com/teen-escapes-12-years-abduction...

    A Colombian school bus driver has been arrested on rape and kidnapping charges after a girl he allegedly snatched over a decade ago managed to escape, authorities said Thursday.

  8. Woman Issues Stern Warning After Senior Dog's Scary ... - AOL

    www.aol.com/woman-issues-stern-warning-senior...

    The bed seems like a good idea. It's big, it's furry, and it's pretty darn cute. It looks like a dog's paw.But it's not great for small dogs, as the woman learned recently.

  9. Letter frequency - Wikipedia

    en.wikipedia.org/wiki/Letter_frequency

    The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. AD 801–873 ), who formally developed the method (the ciphers breakable by this technique go ...