manager churn as a control variable. I've collated data on when clubs have
changed manager. The data is for every club that has appeared in the Premier
League since it started in 1992/3 until the end of the 2012/13 season (21
years). There is one club missing (Wimbledon/MK Dons as they are the only club to shift location significantly in that period - that is if they are the same
club at all). That means there are 44 clubs in the sample.
The table below shows the average number of seasons in which clubs have changed their manager (at least once). It can be seen that over the 21 seasons, clubs changed managers in 8.18 seasons on average. Splitting the time period in two (11 seasons to 2003 and 10 seasons to 2013) there is an almost equal average. When split into three equal periods of 7 seasons there is a notable rise in the average number of seasons with a managerial change to 3.23 in the later period, though there is a dip from the first to second periods. This could explain why there is a sense that the rate has increased dramatically since we are more likely to draw on more recent history for comparison.