Multichannel number counting experiments

The confidence intervals calculated with different statistical methods for thecombined model of number counting experiments have been compared. The Bayesianapproach with flat prior provides the most conservative limit in a vast range ofmodel parameters. The limits calculated with the Feldman-Cousins method aresensitive to the systematics. The results of Hybrid CLs calculations for thecombined model can be the most optimistic but tend to undercover.