CableTV.com has analyzed almost 60 years of television and determined that 25% of all shows are cancelled during their first season. They looked at all one season wonders broadcast between 1955 and 2013 and broke them down by the number of episodes:
3% – 1-5 Episodes
24% – 6-10 Episodes
33% – 11-15 Episodes
17% – 16-20 Episodes
13% – 21-25 Episodes
Here’s the full infographic:
Canceled: Single Season TV Shows – An infographic by the team at CableTV.com
Harry’s Law was not a one-season show. It lasted two.
The Aaron Spelling graphic omits a lot of his shows. Charmed and Seventh Heaven both had long runs
Kind of amusing how that listing for Betty White doesn’t include “The Betty White Show” which was also a one-season wonder!