[R] merge question

[Dr Eberhard W Lisse]

Rolf,

I hear you. 

But, after reflection, ie I looked at my situation again, it is great :-)-O

el


Sent from Dr Lisse's iPad mini

> On Jun 30, 2014, at 0:48, Rolf Turner <r.turner at auckland.ac.nz> wrote:
> 
> 
>> On 30/06/14 10:32, Dr Eberhard W Lisse wrote:
>> 
>> Thanks,
>> 
>> I then set NA to 0, and can do the sutraction,
>> 
>> great.
> 
> Not so great.  I haven't gone through the issues underlying this post, but replacing NA by 0 will almost surely yield nonsense.  "Missing" is ***not*** the same thing as "zero".  Pretending that it is will have disastrous consequences.  Think through what you are trying to do more clearly.
> 
> cheers,
> 
> Rolf Turner