Interpolation
1. If you are above 95th percentile say >95.
2. If you are below 5th percentile say <5.
3. If you are between 5th and 50th percentile: x = your measurement
50[45*(x50th)/(5th50th)]
tells you your interpolated percentile
Derivation:
(x50th)/(5th50th) tells you how far you are from 50th
There are 45 percentile points between 5th and 50th
45*(x50th)/(5th50th) tells you the number of percentile points you
are from 50th.
4. If you are between 95th and 50th percentile:
x = your measurement
50+[45*(x50th)/(95th50th)]
tells you your interpolated percentile
Derivation:
(x50th)/(95th50th) tells you how far you are from 50th
There are 45 percentile points between 95th and 50th
45*(x50th)/(95th50th) tells you the number of percentile points you
are from 50th.
