Empty zero-event sequences are represented with a black square south-west of the bottom left translation zone.
However, the two event sequences given in your example are NOT zero-event sequences. They each have a start event, namely full_time
and part_time
. Such patterns are represented with a square on the first coordinate axis, respectively in regard of full_time and part_time.
If you don't use the embedding trick, they will appear as isolated squares with size proportional to their frequencies. With option ltype = "non-embeddable"
, the pattern will be embedded in some other pattern starting with the same event. This is reflected with the start square bigger than the next one on the same path.
So in your case, if say the first one is the most frequent pattern: With ltype = "unique"
, you should have a relatively large isolated square next to full_time on the first coordinate. With ltype = "non-embeddable"
, you should have an even bigger square next to full_time, but with a path continuing to some point on the second coordinate where you should observe a smaller square (where it represents fewer cases than at the start point).
Hope this helps.