Here at StrictlyDB we use the following criteria to classify these categories:

Bottom 2

A dance is counted as a bottom 2 dance when, after performing it, a couple were announced as being in the bottom 2 and at risk of elimination (and in the dance-off when this is used). For double dance weeks, both dances are counted as bottom 2 with the exception of Week 1 and Week 2 bottom 2 positions where Week 1 results are carried over; for these, only the Week 2 dance is counted as a bottom 2 routine. Week 1 dances are classified separately as ‘Week 1’ unless there was a bottom 2/elimination in the first week of a Series (as in Series 2-7), where they are counted as bottom 2 or elimination dances depending on the outcome.

Elimination

A dance is counted as an elimination dance when, after performing it, a couple were eliminated. This can either be as the result of a dance-off, of a bottom leaderboard position after judges’ scores and public votes are combined, or of a public vote alone (as in the Series 8 & 9 Final night eliminations). For double dance weeks where there was no dance-off, both dances are counted as elimination routines but where a dance-off was held, only the losing dance style performed in the dance-off is counted as an elimination dance (the other is counted as a bottom 2 dance).