# Dataset: tribol_tox.dat
#
# Source: P.S. Hewlett(1969). "The Toxicity to Tribolium Castaneum
# (Herbst) (Coleoptora, Tenebrionidae) of Mixtures of Pyrethrins
# and Piperonyl Butoxide: Fitting a Mathematical Model,"
# Journal of Stored Products Research, Vol. 5, Issue 1, pp1-9.
# 
# Description: Results of experiments varying pyrethrin and piperonyl
# butoxide concentrations on mortality of beetles (tribolium castaneum).
# Model fit (did not include control (0,0) in fit):
#
# Y* = a + b1*log(pyrethrin) + b2*(pip_but)/(b3+pip_but)
# 
# Y* = 5 + z(Mortality proportion)    ("centerd" probit)
# 
# Variables/Columns
# pyrethrin concentration   4-8
# piperonyl butoxide concentration  10-16
# number beetles exposed     20-24
# number mortalities    28-32
#
    1.5       0     150     138
    1.06       0     149      75
    0.75       0     150      32
     1.1    0.25     151     129
    0.78    0.25     151      65
    0.55    0.25     150      19
     0.8     2.5     149     143
    0.57     2.5     150     112
     0.4     2.5     140      37
    0.65      10     150     141
    0.46      10     150     117
    0.32      10     149      56
       0       0     200       1