[R] median for time data

[uvilla]

Thanks you both

Jannis now it is working!!. I just have one mor request, please!
How I'm suppose to make a boxplot with anfang, when working with times, it
just have on the y axis some decimal number which make no sense. i need the
time to appear in the y axis in order to see the median in the boxplot


Thanks again!!!



Jannis v. Buttlar wrote:
> 
> 
> 
> uvilla schrieb:
>> When I use strptime() I just get NA NA NA
>> I`m new at using R, must finisth this work thoug
>> 
>> I guess Im doing totally wrong, actually everytime i try to use "POSIXct"
>> it
>> doesn`t work
>> 
> 
> If you have a look at help(strptime) you find that you have to specify 
> the format in which you time is written.
> 
> Try
> 
> strptime("08:10:10","%H:%M:%S")
> 
> The stuff after the comma in the "" is the way to give strptime the
> format.
> 
> Now you only have use
> 
> strptime(vectorwithyourtime,"%H:%M:%S")
> 
> and you should get a vector with R format times out of it. It uses 
> todays date though but for your calculations this should work. This 
> POSIXct format is not very handy to use though, so you perhaps better 
> consider using library(chron) as Gabor suggested.
> 
> 
> 
> 
>> Thanks a lot
>> 
>> 
>> 
>> Jannis wrote:
>>> Hi,
>>>
>>>
>>> try to convert this to the R time format "POSIXct" or "POSIXlt" via 
>>> strptime(). Then you can simply substract them. I am not sure whether a 
>>> median can be calculated though (should be possible as POSIXct stores 
>>> the value as seconds since 1970....)
>>>
>>> Best
>>> Jannis
>>>
>>> uvilla schrieb:
>>>> Hi everybody
>>>>
>>>> How do I do to calculate the median and average of a colum of time data
>>>> like
>>>> this: "8:50:10". I also need to plot the time difference between two
>>>> colums
>>>> Thanks a lot
>>> ______________________________________________
>>> 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.
>>>
>>>
>>
> 
> ______________________________________________
> 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.
> 
> 

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