CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Competitive search for longest empty intervals (short version)

Peter Damaschke (Institutionen för data- och informationsteknik, Datavetenskap, Algoritmer (Chalmers))
20th Canadian Conference on Computational Geometry CCCG 2008 p. 219-222. (2008)
[Konferensbidrag, refereegranskat]

A problem arising in statistical data analysis and pattern recognition is to find a longest interval free of data points, given a set of data points in the unit interval. We use the inverse length of the empty interval as a parameter in the complexity bounds, since it is small in statistically relevant cases. For sorted point sets we get nearly optimal strategies. While the asymptotic complexities are trivial, achieving an optimal number of operations appears to be difficult. Constant factors can be of practical interest for huge data sets. We derive deterministic and randomized upper and lower bounds. Matching bounds and smooth trade-offs between the different operations (reads, comparisons, subtractions) are open questions. For unsorted point sets, the complexity is at least linear. Therefore we also use statistical inference to get approximate solutions in sublinear time.

Nyckelord: empty intervals, data mining, group testing, randomized algorithm



Denna post skapades 2008-09-03. Senast ändrad 2015-02-11.
CPL Pubid: 73477