skew is the mesaureof data flow to each partation .

suppose i/p is comming from 4 files and size is 1 gb

1 gb= ( 100mb+200mb+300mb+5oomb)

1000mb/4= 250 mb

(100- 250 )/500= --> -150/500 == cal ur self it wil come in -ve value.

calclu for 200,500,300.

+ve value of skew is allways desriable.

skew is a indericet measure of graph.