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<data name="Algal Bloom: Exp Conditions" nickname="ExpCond">
<description>
Data from
  Box, Hunter and Hunter
  "Statistics for Experimenters"
  Wiley 1978
  p. 442-3

"This investigation was concerned with the study of the growth of algal
blooms and the effects of phosphorus, nitrogen, and carbon on algae
growth.  A 2^3 factorial experiment was performed, using laboratory
batch cultures of blue-green Microcystis aeruginosa.  Carbon (as bi-
carbonate), phosphorus (as phosphate), and nitrogen (as nitrate) were
the variable factors.  The response was algal population, measured
spectrophotometrically."

The responses are measured in some absorbance units.

(Source: R. W. Mann, "Significance of Phosphorus, Nitrogen and
Carbon as Regulators of the Growth of the Alga Microcystis aeruginosa,"
Master's Thesis, Department of Civil Engineering, Tufts University,
Medford, Mass., June 1971.)
</description>
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     <level value="1"> 1 </level>
     <level value="2"> 2 </level>
     <level value="3"> 3 </level>
     <level value="4"> 4 </level>
     <level value="5"> 5 </level>
     <level value="6"> 6 </level>
     <level value="7"> 7 </level>
     <level value="8"> 8 </level>
   </levels>
 </categoricalvariable>
 <categoricalvariable name="Phosph">
   <levels count="2">
     <level value="0"> low </level>
     <level value="1"> high </level>
   </levels>
 </categoricalvariable>
 <categoricalvariable name="Nitrog">
   <levels count="2">
     <level value="0"> low </level>
     <level value="1"> high </level>
   </levels>
 </categoricalvariable>
 <categoricalvariable name="Carbon">
   <levels count="2">
     <level value="0"> low </level>
     <level value="1"> high </level>
   </levels>
 </categoricalvariable>
 <realvariable name="Day 4"  min="0.200"  max="0.900" />
 <realvariable name="Day 6"  min="0.200"  max="0.900" />
 <realvariable name="Day 8"  min="0.200"  max="0.900" />
 <realvariable name="Day 10" min="0.200"  max="0.900" />
</variables>
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 <record id="105"> 5  0 0 1  0.479 0.639 0.656 0.679   </record>
 <record id="106"> 6  1 0 1  0.481 0.583 0.631 0.648   </record>
 <record id="107"> 7  0 1 1  0.465 0.657 0.736 0.680   </record>
 <record id="108"> 8  1 1 1  0.451 0.768 0.814 0.799   </record>
</records>
</data>

<data name="Measurements" nickname="Measmnts">
<description>
</description>
<variables count="6">
 <categoricalvariable name="Condition">
   <levels count="8">
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     <level value="2"> 2 </level>
     <level value="3"> 3 </level>
     <level value="4"> 4 </level>
     <level value="5"> 5 </level>
     <level value="6"> 6 </level>
     <level value="7"> 7 </level>
     <level value="8"> 8 </level>
   </levels>
 </categoricalvariable>
 <categoricalvariable name="Phosph">
   <levels count="2">
     <level value="0"> low </level>
     <level value="1"> high </level>
   </levels>
 </categoricalvariable>
 <categoricalvariable name="Nitrog">
   <levels count="2">
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     <level value="1"> high </level>
   </levels>
 </categoricalvariable>
 <categoricalvariable name="Carbon">
   <levels count="2">
     <level value="0"> low </level>
     <level value="1"> high </level>
   </levels>
 </categoricalvariable>
 <realvariable name="Algal Count"  min="0.200"  max="0.900" />
 <realvariable name="Day" />
</variables>
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</data>

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