Calculate percentage difference between two columns


 
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# 8  
Old 07-24-2016
Try also (untested)
Code:
awk '{sqrt($2*$2/$3*$3)>1.05}' file

# 9  
Old 07-25-2016
Post#8 was - hmmm - UNTESTED; sorry for that and thanks to RavinderSingh13 for pointing that out!

The percentage is dependent on the reference column, i.e. 10 and 10.5 have a 5% diff if referenced to 10, but 4,76% if reffed to 10.5 . Using col 2 as the reference, try
Code:
awk 'sqrt((1-$3/$2)*(1-$3/$2)) > 0.05'  file

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