[R] lattice strip.custom in plot for multiple groups

[David Winsemius]

> On Dec 18, 2015, at 12:22 PM, Luigi Marongiu <marongiu.luigi at gmail.com> wrote:
> 
> Dear all,
> I am plotting the count of some data subdivided in different groups.
> the variables i am using are:
> A = tests performed
> B = positive/negative results (but in this case the results are all
> positive, so all 1)
> C = multiple (1) or single (0) test applied
> D = count of instances
> E = cases (1) or controls (0)
> 
> the plot looks the way I need and it is created with lattice's
> barchart. However the strip should indicate "cases"/"controls" and
> instead only shows "E"/"E" so I think I messed somewhere.
> Would you know what did I missed?
> Thank you
> L
> 
> The example:
>>>> 
> A <- c('a',    'b',    'c',    'd',    'a',    'b',    'c',    'd',
> 'b',    'c',    'd',    'b',    'c',    'd')
> B <- c(1,    1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
>  1,    1,    1)
> C <- c(0,    0,    0,    0,    1,    1,    1,    1,    0,    0,    0,
>  1,    1,    1)
> D <- c(4,    120,    7,    23,    4,    24,    3,    12,    7,    1,
> 1,    5,    0,    0)
> E <- c(0,    0,    0,    0,    0,    0,    0,    0,    1,    1,    1,
>  1,    1,    1)
> DF <- data.frame(A, B, C, D, E, stringsAsFactors = FALSE)
> library(lattice)
> barchart(
>    A ~ D|E,
>    DF,
>    groups = C,
>    stack = TRUE,
>    main = "Comparison of test results",
>    xlab = "Count",
>    col = c("yellow", "orange"),
>    par.settings = list(
>        strip.background = list(col="light grey"),
>        superpose.polygon=list(col= c("yellow", "orange"))
>    ),
>    scales = list(
>        alternating = FALSE
>    ),
>    key = list(
>        space="top",
>        columns=2,
>        text=list(c("Single infections", "Multiple infections"), col="black"),
>        rectangles=list(col=c("yellow", "orange"))
>    ),
>    strip = strip.custom(factor.levels = c("Cases","Controls"),

Also need to set the logical flag strip.levels to TRUE.

strip = strip.custom(factor.levels = c("Cases","Controls"), 
                      strip.levels=TRUE,
                        par.strip.text = list(cex = 1)

If you do not want the variable name "E" displayed then set the correct flag to FALSE. See: 

?strip.custom

-- 
David


>                         par.strip.text = list(cex = 1)
>    )
> )
> 
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David Winsemius
Alameda, CA, USA