Two cases may occur:
Wouldn't there be 4 cases?
- numTags = 0, pulseCount = NA: No tags and no radio pulses
- numTags = 0, pulseCount > 0: No tags detected, but radio pulses detected (likely radio noise)
- numTags > 0, pulseCount = NA: Tags were detected, but no radio pulses were detected. (!! I don't think this option should make sense, but the activity table has a few rows that meet this condition)
- numTags > 0, pulseCount > 0: Tags and radio pulses detected (makes sense - this is the case where tagged birds are detected)