Glitch activity as a function of various pulsar parameters (all of them combinations of frequency ν and its time-derivative ). Black dots are the values calculated according to Eq. (1), for rotation-powered pulsars grouped in bins of width 0.5 in the logarithm (base 10) of the variable on the horizontal axis. The crosses denote bins (groups of pulsars) with no detected glitches, and the gray squares represent individual magnetars.