It worked, thanks.

On Tue, Aug 9, 2011 at 4:15 PM, Brian Diggs <diggsb@ohsu.edu> wrote:

> On 8/9/2011 10:32 AM, Fernando Andreacci wrote:
>
>> Hi, I got what I want using
>>
>>
>> lines(varmeasure ~ vardates)
>>
>> but, as I'm using as.Date(vardates) in my boxplot code
>>
>> boxplot(varmeasure ~ as.Date(vardate))
>>
>> I want to change how vardate is displayed
>> I used strftime(as.Date(vardate), format="%m/%Y") and it worked well,
>> However it mixed the inital and final dates.
>>
>> My data has measuraments from october 2010 to june 2011.
>>
>> If I use  boxplot(varmeasure ~ as.Date(vardate)), data is displayed from
>> 2010 to 2011.
>>
>> if I use boxplot(varmeasure ~ strftime(as.Date(vardate), format="%m/%Y"))
>> data is displayed mixing 2010 and 2011 months in order to get jan to dez
>> display.
>>
>>
>> I need a way to keep my data display from oct 2010 to june 2011 but I also
>> need a way to change how X scale is displayed.
>>
>> How can do it?
>>
>
> Make the "date" variable a factor with the right format and the levels in
> chronological order:
>
> vardates <- c("10/1/2010", "10/1/2010", "10/1/2010", "10/1/2010",
>        "10/1/2010", "10/1/2010", "10/1/2010", "10/1/2010", "10/1/2010",
>        "11/1/2010", "11/1/2010", "11/1/2010", "11/1/2010", "11/1/2010",
>        "11/1/2010", "11/1/2010", "11/1/2010", "11/1/2010", "12/1/2010",
>        "12/1/2010", "12/1/2010", "12/1/2010", "12/1/2010", "12/1/2010")
> varmeasure <- c(0.0, 26.0,  0.2, -0.2, -1.2, -0.8,  0.0,  4.4, -0.6,
>        0.2, 14.4, -0.2, 4.8, 4.0, 2.8, 3.2, 3.8, 3.2, -11.4, 0.2, 0.4,
>        3.0, 0.6, 6.2)
>
> vardates <- as.Date(vardates, format="%m/%d/%Y")
> vardates.fmt <- factor(strftime(vardates, format="%m/%Y"),
>        levels=strftime(sort(unique(**vardates)), format="%m/%Y"))
>
> boxplot(varmeasure ~ vardates)
> boxplot(varmeasure ~ vardates.fmt)
>
>  Thanks
>>
>> On Tue, Aug 9, 2011 at 12:32 PM, David Winsemius<dwinsemius@comcast.**net<dwinsemius@comcast.net>
>> >wrote:
>>
>>
>>> On Aug 9, 2011, at 10:17 AM, Fernando Andreacci wrote:
>>>
>>>  It worked, thanks.
>>>
>>>>
>>>> Is there a way to put a trend line through the boxplots?
>>>>
>>>>
>>> You have not shown us how you set the data up or made the boxplots. A
>>> "trend line through boxplots" seems be a bit ambiguous, since the
>>> x-variable
>>> needs to be a factor and  a factor variable would not necessarily have
>>> either a scale or an order. So the answer with the available information
>>> cannot be anymore specific than "it depends".
>>>
>>> --
>>> David.
>>>
>>>
>>>>
>>>> On Tue, Aug 9, 2011 at 10:58 AM, David Winsemius<dwinsemius@comcast.**
>>>> net <dwinsemius@comcast.net>
>>>>
>>>>> wrote:
>>>>>
>>>>
>>>>
>>>>  On Aug 9, 2011, at 9:46 AM, Fernando Andreacci wrote:
>>>>>
>>>>> I'm trying to make a monthly boxplot using this:
>>>>>
>>>>>
>>>>>> boxplot(varmeasure ~ vardates)
>>>>>>
>>>>>> vardates = [1] 10/1/2010 10/1/2010 10/1/2010 10/1/2010 10/1/2010
>>>>>> 10/1/2010
>>>>>> 10/1/2010
>>>>>> [8] 10/1/2010 10/1/2010 11/1/2010 11/1/2010 11/1/2010 11/1/2010
>>>>>> 11/1/2010
>>>>>> ....
>>>>>>
>>>>>> varmeasure =  [1]   0.0  26.0   0.2  -0.2  -1.2  -0.8   0.0   4.4
>>>>>>  -0.6
>>>>>> -0.2  14.4  -0.2
>>>>>> [13]   4.8   4.0   2.8   3.2   3.8   3.2 -11.4   0.2   0.4   3.0   0.6
>>>>>> 6.2
>>>>>> ....
>>>>>>
>>>>>>
>>>>>> they have same size.
>>>>>>
>>>>>>
>>>>>> My problem is that R is ploting ordered by months and not by year and
>>>>>> by
>>>>>> months
>>>>>>
>>>>>> I'm getting 1/1/2011, 10/1/2010, 11/1/2010, 2/1/2011
>>>>>>
>>>>>> How can I plot it in chronological order?
>>>>>>
>>>>>>
>>>>>>  By converting those character strings to dates. At the moment you
>>>>> seem to
>>>>> believe that R has the ability to "know" that you want these strings to
>>>>> be
>>>>> dates.
>>>>>
>>>>> ?as.Date
>>>>> ?Dates
>>>>>
>>>>> --
>>>>>
>>>>> David Winsemius, MD
>>>>> West Hartford, CT
>>>>>
>>>>>
>>>>>
>>>>>
>>>> --
>>>> Fernando Andreacci
>>>> Biólogo
>>>> Fone +55 47 9921 4015
>>>>       +55 41 9921 3934
>>>> fandreacci@gmail.com
>>>>
>>>>        [[alternative HTML version deleted]]
>>>>
>>>> ______________________________****________________
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>>>> https://stat.ethz.ch/mailman/****listinfo/r-help<https://stat.ethz.ch/mailman/**listinfo/r-help>
>>>> <https://stat.**ethz.ch/mailman/listinfo/r-**help<https://stat.ethz.ch/mailman/listinfo/r-help>
>>>> >
>>>>
>>>> PLEASE do read the posting guide http://www.R-project.org/**
>>>> posting-guide.html<http://www.**R-project.org/posting-guide.**html<http://www.R-project.org/posting-guide.html>
>>>> >
>>>>
>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>
>>>>
>>> David Winsemius, MD
>>> West Hartford, CT
>>>
>>>
>>>
>>        [[alternative HTML version deleted]]
>>
>>
>>
>>
>>
>
> --
> Brian S. Diggs, PhD
> Senior Research Associate, Department of Surgery
> Oregon Health & Science University
>
>
> ______________________________**________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/**listinfo/r-help<https://stat.ethz.ch/mailman/listinfo/r-help>
> PLEASE do read the posting guide http://www.R-project.org/**
> posting-guide.html <http://www.R-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>

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