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<dwinsem...@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<dwinsem...@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
fandrea...@gmail.com
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David Winsemius, MD
West Hartford, CT
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--
Brian S. Diggs, PhD
Senior Research Associate, Department of Surgery
Oregon Health & Science University
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