[R] median Q?

[Joshua Wiley]

Look at ?by

for example

by(data=v2, INDICES=v1, FUN=median, na.rm=TRUE)

This will calculate the median of v2 (age) for each level of the
indices v1 (in your case M and F).


If you are only interested the median for a single level, Mohamed's
solution is simpler.

Josh


On Wed, Apr 21, 2010 at 8:10 AM, Vlatka Matkovic Puljic
<v.matkovic.puljic at gmail.com> wrote:
> I have additional Q:
>
> v1 is gender (M=1 and F=2)
> v2 is age
>
> I want R to calculate median only for M (1),
> but my comand is not good :)
>
> while(v1=1){median(v2,na.rm=TRUE)}
> Error: unexpected '=' in "while(Q2="
>
> 2010/4/21 Vlatka Matkovic Puljic <v.matkovic.puljic at gmail.com>
>>
>> Thank you!
>>
>> 2010/4/21 Joshua Wiley <jwiley.psych at gmail.com>
>>>
>>> Hello,
>>>
>>> summary() removes NAs by default.  You can get the same results using
>>>
>>> median(year, na.rm=TRUE)
>>>
>>> see ?median
>>>
>>> HTH,
>>>
>>> Josh
>>>
>>> On Wed, Apr 21, 2010 at 6:40 AM, Vlatka Matkovic Puljic
>>> <v.matkovic.puljic at gmail.com> wrote:
>>> > Hi,
>>> >
>>> > I have dataset n1 and v1 (years).
>>> > when i ask
>>> > median(year)
>>> > [1] NA
>>> >
>>> > but if i put summary of dataset n1:
>>> > summary(n1)
>>> > R produces median (together with min/max/mean....)
>>> >
>>> > why it is so?
>>> >
>>> >
>>> > --
>>> > **************************
>>> > Vlatka Matkovic Puljic
>>> > 095/8618 171
>>> >
>>> >        [[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.
>>> >
>>>
>>>
>>>
>>> --
>>> Joshua Wiley
>>> Senior in Psychology
>>> University of California, Riverside
>>> http://www.joshuawiley.com/
>>
>>
>>
>> --
>> **************************
>> Vlatka Matkovic Puljic
>> 095/8618 171
>
>
>
> --
> **************************
> Vlatka Matkovic Puljic
> 095/8618 171
>



-- 
Joshua Wiley
Senior in Psychology
University of California, Riverside
http://www.joshuawiley.com/