Time interval data and weighting

[fluff]

Hi,

I have a tricky question: I am comparing time interval data between
two groups. To simplify things, I'll use leaves for my example.

Okay. There is a tree. There are three types of leaves on this tree:
Red, Green and Yellow. There are equal numbers of leaves of each
colour.

The leaves fall to the ground one by one. I want to compare the time
intervals between consecutive pairs of same coloured leaves falling to
the ground with consecutive pairs of different coloured leaves falling
to the ground. My data is in seconds. Here is my example :

First data set (Group
1) COLUMN A
time interval between red leaf and another red leaf =
8739 seconds
time interval between yellow leaf and another yellow leaf =
7290749 seconds
time interval between red leaf and another red leaf =
2093730 seconds
time interval between green leaf and another green leaf = 27
seconds

Second data set (Group
2) COLUMN B
time interval between red leaf and a green leaf =
853567seconds
time interval between yellow leaf and a red leaf =
466 seconds
time interval between red leaf and a green leaf =
68086 seconds
time interval between yellow leaf and a green leaf =
4787 seconds

I want to compare the time intervals between column A and column B
( i.e does the data in column A have smaller mean time interval to the
data in column B?) except I have to weight the data, because for
example, there is more chance of a red leaf falling after a non red
leaf (because there are two other different colours). Does this make
sense?

I hope someone can help me with this query.

Many thanks.