[R] Multiple missing values

[Patrick Burns]

I can think of a few solutions, none perfect.

* You could have a master dataset that has the
missing value codes you want, and a dataset that
you use which is a copy of it with real NA's in it.

* You could add an attribute that gives the types
of missing values in the various positions.  The
downside is that attributes tend to disappear with
subsetting.

* If you only have two types, you might be able to
get away with using NaN as the second type of NA.

On 14/02/2010 14:33, John wrote:
> Does anyone know, or know documentation that describes, how to declare
> multiple values in R as missing that does not involve coding them as NA? I
> wish to be able to treate values as missing, while still retaining codes
> that describe the reason for the value being missing.
>
> Thanks
>
> John MAcInnes
>
>
>
>
>
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-- 
Patrick Burns
pburns at pburns.seanet.com
http://www.burns-stat.com
(home of 'The R Inferno' and 'A Guide for the Unwilling S User')