Table 1. Example of data—calculating metrics.

Participant	Active days	Total days linked to iNaturalist	First Day to 31st January 2020	Activity Ratio	Relative Activity Duration	Variation in Periodicity (days)	Variation in Periodicity (normalised)
User152	451	1043	1056	.43	.99	2.07	0
User 25	168	362	524	.46	.69	2.42	0
User35	18	415	1056	.04	.39	72.76	.08
User82	3	360	1387	.01	.26	252.44	.29
User52	1	1	105	1.00	.01	N/A	N/A

The first four columns show the participant username, the number of active days, total days linked to iNaturalist, number of days between their first contributing day and the date that data were downloaded. The last four columns are calculations of the participation metrics (activity ratio, relative activity duration and variation in periodicity), based on the information given in the first columns. For example, User152 was active 451 out of the 1043 days that they were linked to iNaturalist (Activity ratio = 0.43).