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?

thanks


-- 
Fernando Andreacci

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