Figure 1. Relationship of frequency 
to dissemination across users 
.
A, B, The results are shown for half-year windows centered on 1998-01-01 for the comp.os.linux.misc group (A) and the rec.music.hip-hop group (B). Red solid line: running median for all words with 
. Red dashed lines: 
th and 
th percentiles for the same words. Blue dashed lines: 
th and 
th percentiles around the expected value of 
for randomly distributed words, determined by Monte Carlo simulations with 
independent shufflings of the text. Black line: analytically calculated ceiling 
(floor effects and the other ceiling, 
, do not pertain within the scale of the figure). The median empirical 
is systematically below the 
th percentile of the estimated random variation. The relationship of median 
to 
is nearly flat up to 
.