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Example 34
For each flower, the Posterior Predictive Distributions window shows the probability
that that flower is setosa, versicolor, or virginica.
For the first 50 flowers (the ones that actually are setosa), the probability of
membership in the setosa group is nearly 1. We expected that result because the setosa
flowers were clearly separated from flowers of other species in the scatterplot shown
earlier.
Most of the versicolor flowers (starting with case number 51) were also correctly
classified. For example, flower number 51 has posterior probability 0.95 of being
versicolor. However, classification errors do occur. Case number 71, for example, is
misclassified. It is a versicolor flower, but it is estimated to have a 0.74 probability of
being virginica.