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We present an overview and statistical analysis of the data included inWEBDA. This database includes valuable information such as coordinates,rectangular positions, proper motions, photometric as well as spectroscopicdata, radial and rotational velocities for objects of open clusters in ourMilky Way. It also contains miscellaneous types of data like membershipprobabilities, orbital elements of spectroscopic binaries and periods ofvariability for different kinds of variable stars. Our final goal is to deriveastrophysical parameters (reddening, distance and age) of open clusters basedon the major photometric system which will be presented in a follow-up paper.For this purpose we have chosen the Johnson UBV, Cousins VRI and Stroemgrenuvbybeta photometric systems for a statistical analysis of published data setsincluded in WEBDA. Our final list contains photographic, photoelectric and CCDdata for 469820 objects in 573 open clusters. We have checked the internal(data sets within one photometric system and the same detector technique) andexternal (different detector technique) accuracy and conclude that more than97% of all investigated data exhibit a sufficient accuracy for our analysis.The way of weighting and averaging the data is described. In addition, we havecompiled a list of deviating measurements which is available to the communitythrough WEBDA.Comment: 8 pages, 4 figures, accepted by A&

Analysing the database for stars in open clusters