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21 The Io9issSc aodel that considers expomae as an ordinal<br />
cateqorical variable w fitced to the data. These aodels<br />
provided esc.imetc of tife effect of each of the Lewis of<br />
eQImICe Yslnq Lero C1pML^e as the [e!ere11C^8 rJtH]oC( .<br />
31 In order to test for a lLr.ar trer.4 in the levels of the<br />
catcqory, a third eodsl as fitted . This inclVded as the<br />
reqressx veriabie the oasrca~tml dif`ere.oes cf the mid-points<br />
of the atavo
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