Descriptive statistics for call groups, calls, and pulses, including means (X¯), standard deviations (SDs), ranges, and coefficients of variation.

†For calls per call group and pulses per call, the values reported in the columns headed X¯ and SD, respectively, are the median and interquartile range. Note, however, that coefficients of variation for these two properties are computed from the X¯ and SD.