[R] Two graphs on one using barchart

From: Spilak,Jacqueline [Edm] <Jacqueline.Spilak_at_ec.gc.ca>
Date: Mon, 28 Apr 2008 16:49:53 -0600

> Hi R users
> Here is an example of my data (only a small part)
>
> Year Season A_Time R_Time O_Time All_Time AandR_Time
> A_number R_number O_number AandR_number all_number
> 1999 Winter 9.590741 35.312963 42.759524 23.228431 18.164815
> 18 9 7 27
> 34
> 2000 Winter 9.899537 47.945000 59.744444 20.301333 18.170290
> 36 10 3 46
> 49
> 2001 Winter 12.861364 26.239583 52.350000 23.376068 16.428889
> 22 8 8 30
> 38
> 2002 Winter 11.954902 40.245833 49.025000 19.294025 17.343651
> 34 8 6 42
> 48
> 2003 Winter 6.843750 43.753704 50.533333 16.873246 11.954359
> 56 9 10 65
> 75
> 2004 Winter 7.866216 25.808333 48.381481 16.628931 10.369767
> 37 6 9 43
> 52
> 2005 Winter 11.225194 26.504762 31.432353 17.684804 13.364333
> 43 7 17 50 67
> 2006 Winter 11.080000 46.388889 23.820370 17.922414 16.964815
> 15 3 9 18
> 27
> 2007 Winter 12.461628 40.722727 25.557576 20.078788 18.218519
> 43 11 22 54
> 76
>
> At the moment I am plotting (using barchart) the A_Time data grouped
> by season then by year.
> Here is my code that does this.
>
> barchart(A_Time ~ factor(Season), data= .summary_response, main =
> plottitle1, xlab= "Season", ylab= "Time in Minutes", origin = 0,
> groups= Year)
>
> I want to add the A_number data to the plot that I have so far and I
> want it as little line bars that match up to the bars already on the
> graph with the axis for the A_number on the right side of the graph
> and with a different scale.
> Any help to do this is greatly appreciated.
> Thanks in advance
> Jacqueline

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