Sugar-cane Disease Data

SUMMARY:
       The cane data frame has 180 rows and 5 columns.

       The data frame represents a randomized block  design  with
       45  varieties  of sugar-cane and 4 blocks.  The aim of the
       experiment was to classify the varieties  into  resistant,
       intermediate  and susceptible to a disease called "coal of
       sugar-cane" (carvao da cana-de-acucar).  This is a disease
       that  is common in sugar-cane plantations in certain areas
       of Brazil.

       For each plot, fifty pieces of sugar-cane stem were put in
       a solution containing the disease agent and then some were
       planted in the plot.  After a fixed period  of  time,  the
       total  number  of shoots and the number of diseased shoots
       were recorded.

DATA DESCRIPTION:
       This data frame contains the following columns:

n:     The total number of shoots in each plot.
r:     The number of diseased shoots.
x:     The number of pieces of the stems, out of 50,  planted  in
       each plot.
var:   A factor indicating the  variety  of  sugar-cane  in  each
       plot.
block:    A factor for the blocks.

SOURCE:
       The data were kindly supplied by Dr.  C.G.B.  Demetrio  of
       Escola Superior de Agricultura, Universidade de Sao Paolo,
       Brazil.

OTHER REFERENCES:
       Davison, A.C. and Hinkley, D.V. (1997)  Bootstrap  Methods
       and Their Application. Cambridge University Press.