Data manipulation

["Khan, Sohail" <khan@cshl.edu>]

Dear list,

I have a data frame as:

id      ratio   abs.pos
a       1.5     25
b       2.5     36
c       1.9     48
d       2.3     57
e       2.9     66
f       1.3     74

I would like to do something like:
abs.pos1 + 10 = x
while x < abs.pos2.....abs.pos3.....abs.pos6
average(ratio1.......ratio6)
print id1       avg.ratio 

otherwise 
abs.pos2+10=y
while y<abs.pos3....abs.pos4....
 average(ratio2,ratio4)
print id2 avg.ratio

Thanks for any suggestions.


Sohail