monthly boxplot
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 at 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 at 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
Bi?logo
Fone +55 47 9921 4015
+55 41 9921 3934
fandreacci at gmail.com
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______________________________**________________ R-help at 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.
David Winsemius, MD West Hartford, CT
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Brian S. Diggs, PhD Senior Research Associate, Department of Surgery Oregon Health & Science University