[gradsusr] How to calculate "quartile" like value using grads script?

[Brandon Brown]

Hi,

I am newbie, now I want to draw a boxplot, but I don't now how to calculate
the values which ares quartile like.

As you know, quartile calculate q1(25%), q2(50%), q3(75%), and now I want
to calculate q1(15%), q2(25%), q3(50%), q4(75%), q5(85%).

Could any one help me, thanks.

Brown.
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