R help - Nov 2012 - strip.custom() with more than one conditioning variable

Suppose I wanted to plot the barley data like this:

    dotplot(variety ~ yield | year+ site, barley,
            strip = strip.custom(style = 4))

The factor levels are far too long for that to be useful.  I can
overcome that problem if I shorten the levels like this:

    dotplot(variety ~ yield | year + site, barley,
            strip = strip.custom(style = 4,
              factor.levels =  substring(levels(barley$site), 1, 1)))

But that messes up the year levels.  So I try to have it influence
only the site levels:

    dotplot(variety ~ yield | year+ site, barley,
            strip = strip.custom(which.given = 2, style = 4,
              factor.levels =  substring(levels(barley$site), 1, 1)))

But then the year strip is omitted altogether.  How do I specify
a different list for different which.given numbers?

In this case, I know I could simply redefine the levels in the factor
but that's not an option where I wish to apply this method.

TIA
Patrick

Hi Patrick

Not sure what you finally want to achieve but will this do?

I have reduced the size of the text to make them readible

  dotplot(variety ~ yield | year+ site, barley,
             strip = strip.custom(which.given = 2, style = 4,
                           factor.levels = paste(levels(barley$year), 
substring(levels(barley$site), 1, 1)),
                           par.strip.text = list(cex = 0.75))
)

Regards

Duncan


Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2351
Email: home: mackay at northnet.com.au



At 06:53 16/11/2012, you wrote:
>Suppose I wanted to plot the barley data like this:
>
>     dotplot(variety ~ yield | year+ site, barley,
>             strip = strip.custom(style = 4))
>
>The factor levels are far too long for that to be useful.  I can
>overcome that problem if I shorten the levels like this:
>
>     dotplot(variety ~ yield | year + site, barley,
>             strip = strip.custom(style = 4,
>               factor.levels =  substring(levels(barley$site), 1, 1)))
>
>But that messes up the year levels.  So I try to have it influence
>only the site levels:
>
>     dotplot(variety ~ yield | year+ site, barley,
>             strip = strip.custom(which.given = 2, style = 4,
>               factor.levels =  substring(levels(barley$site), 1, 1)))
>
>But then the year strip is omitted altogether.  How do I specify
>a different list for different which.given numbers?
>
>In this case, I know I could simply redefine the levels in the factor
>but that's not an option where I wish to apply this method.
>
>TIA
>Patrick
>
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