2.2 Seasonal activity of movements
Time series were constructed with the sum of the monthly number of
active premises, movements, and animals in the study period (36 months).
The absence of serial correlations was then assessed using partial
autocorrelation plots. A Mann-Kendall seasonal trend test (Pohlert,
2020) was applied to determine the statistical significance of the
overall (full time series) and seasonal trends (months). Pettitt’s test
(Pettitt, 1979) was performed to detect a single point of change in the
time series.