Journal on Policy & Complex Systems Vol. 2, Issue 2, Fall 2015 | Page 43

Journal on Policy and Complex Systems
Average Age of Producers

Figure 4 illustrates the means and standard deviations of the age of producers

( green bars ) participating under each policy option . The average producer age was significant ( F ( 4,4995 ) = 179 , p < 0.001 ) across the five different policies . In the figure , means that do not share a ( lower case ) letter are significantly different , as calculated by post-hoc analysis . There was a large ( d = 1.07 ) difference between Policy 1 ( No Management ) and Policy 2 ( Supply & Demand ), and a medium ( d = 0.73 ) difference between Policy 1 and Policy 4 ( Price ). There was a medium ( d = 0.70 ) difference between Policy 2 and Policy 3 ( Size ), and a medium ( d = −0.79 ) difference between Policy 2 and Policy 5 ( Size & Price ). All other pairwise combinations showed a small effect size ( 0.20 < d < 0.50 ), except for the negligible effect size between Policies 3 and 5 .
Average Producer Size

Figure 5 illustrates the means for the number of participating producers by

size : small producers ( blue ), medium producers ( green ), and large producers ( red ), under each policy option .
Figure 5 . Average size category of producers under each policy option . Means from each producer size category that do not share a letter are significantly different .
Small producers . The number of small producers ( blue bars in Figure 5 ) was significant ( F ( 4,4995 ) = 86.3 , p < 0.001 ) across the five different policies . In the figure , means that do not share a ( upper case ) letter are significantly different , as calculated by post-hoc analysis . There were small difference between the following pairs of means : between Policy 1 ( No Management ) and Policy 2 ( Supply & Demand ) ( d = 0.44 ), and between Policy 1 and Policy 4 ( Price ) ( d = 0.33 ). There
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