[R] How to do a backward calculation for each record in a dataset

Bert Gunter gunter.berton at gene.com
Sun Feb 17 19:18:43 CET 2013


Homework? We don't do homework here.

-- Bert

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,
> Prakasit
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm



More information about the R-help mailing list