[R] How to do a backward calculation for each record in a dataset
gunter.berton at gene.com
Sun Feb 17 19:18:43 CET 2013
Homework? We don't do homework here.
On Sun, Feb 17, 2013 at 5:10 AM, Prakasit Singkateera
<asltjoey.rsoft at gmail.com> wrote:
> Hi Experts,
> I have a dataset of 3 columns:
> customer.name product cost
> John Toothpaste 30
> Mike Toothpaste 45
> Peter Toothpaste 40
> And I have a function of cost whereby
> cost = 3.40 + (1.20 * no.of.orders^2)
> I want to do a backward calculation for each records (each customer) to
> find his no.of.orders and create a new column named "no.of.orders" in that
> dataset but I don't know how to do.
> Please help me.
> Thank you everyone,
> [[alternative HTML version deleted]]
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Genentech Nonclinical Biostatistics
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