[R] output data by date?

[John Kane]

I think we need a bit more detall of the code that you are using and the  structure of the data set.  

Would you please supply some sample data (see ?dput for a convenient way to supply data to the R-help list.

Also the output of str() would be useful.

A good guideline for asking a question in the list can be found at  http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example

John Kane
Kingston ON Canada


> -----Original Message-----
> From: kath.regan at gmail.com
> Sent: Wed, 28 Nov 2012 13:13:32 +0100
> To: r-help at r-project.org
> Subject: [R] output data by date?
> 
> Dear Helpers,
> 
> I have a dataset X, with no missing values, everything is in order, R
> reads
> it correctly, and I have already done some statistical analyses on the
> dataset. The data are in order by date (six sampling dates in one year,
> earliest to latest) and I now want to generate boxplots for each
> parameter
> for each date.
> 
> However, R outputs the boxplots in some order that I do not understand
> (eg.
> 10.5.2011, 11.21.2011, 4.5.2011, 5.17.2011, 6.27.2011, 8.16.2011) instead
> of chronologically as the data are in the dataframe.
> 
> I tried reformatting the date field from English (US) to German, just in
> case my R was confused, but still R seems to use its own rules. The data
> do
> not occur in any rank or order with R's way of organizing the dates (not
> highest to lowest, or lowest to highest) so I don't know why it is
> ordering
> the dates as it is.
> 
> This also happened when I ran ANOVAs on the parameters. I got the same
> output (mean values and Tukey HSD significance) using the dates formatted
> in both ways (whew! I would have really been worried, otherwise!) But now
> for the boxplots, which might eventually be included in the paper, I want
> to make it easier for the reader to interpret, so would like to have them
> ordered from earliest (4.5.2011- April, to 11.21.2011 - November.)
> 
> Does anyone have a suggestion for how I can correct this?
> 
> Thanks very much and my apologies if this has been covered before. I
> looked
> before posting my question, however, and couldn't find anything.
> 
> --
> Kathleen Regan
> 
> University of Hohenheim
> 
> Institute of Soil Science and Land Evaluation
> 
> Soil Biology Section
> 
> Emil-Wolff-Str. 27
> 
> D-70593 Stuttgart-Hohenheim
> 
> "Traveler, there is no road. We make the road by walking."
> 
> phone: +49(0)711 459 23118
> 
> fax: +49(0)711 459 23117
> E-mail:kath.regan at gmail.com
> 
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> 
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