trajectory summary

[pennekampster]

We could use the median instead of the mean; probably good idea to check some of the within trajectory variation

[opetchey]

I don't understand this. Can you expand?

[pennekampster]

It's just that the mean would be more strongly affected by, say an erroneous measurement of size due to merging of an individual with a large debris particle, than the median. I am also not sure all traits we average are normally distributed.

[opetchey]

I see. Agree. Suggest we put a switch in the function, for summarise with median or mean, with median as the default.

[pennekampster]

Issue fixed by Marco.