OrchardSprays            package:datasets            R Documentation

Potency of Orchard Sprays

Description:

     An experiment was conducted to assess the potency of various
     constituents of orchard sprays in repelling honeybees, using a
     Latin square design.

Usage:

     OrchardSprays

Format:

     A data frame with 64 observations on 4 variables.

       [,1]  rowpos     numeric  Row of the design
       [,2]  colpos     numeric  Column of the design
       [,3]  treatment  factor   Treatment level
       [,4]  decrease   numeric  Response

Details:

     Individual cells of dry comb were filled with measured amounts of
     lime sulphur emulsion in sucrose solution.  Seven different
     concentrations of lime sulphur ranging from a concentration of
     1/100 to 1/1,562,500 in successive factors of 1/5 were used as
     well as a solution containing no lime sulphur. 

     The responses for the different solutions were obtained by
     releasing 100 bees into the chamber for two hours, and then
     measuring the decrease in volume of the solutions in the various
     cells.

     An 8 x 8 Latin square design was used and the treatments were
     coded as follows:

       A  highest level of lime sulphur
       B  next highest level of lime sulphur
       .  
       .  
       .  
       G  lowest level of lime sulphur
       H  no lime sulphur

Source:

     Finney, D. J. (1947) _Probit Analysis_. Cambridge.

References:

     McNeil, D. R. (1977) _Interactive Data Analysis_. New York: Wiley.

Examples:

     require(graphics)
     pairs(OrchardSprays, main = "OrchardSprays data")

