Different encounter rate values in ds and dht2, also inconsistent relationships with se.ER and cv.ER

[LHMarshall]

Noticed that the ER's are different in the ds summary versus the dht2 output. The dht2 figure seems intuitive I'll look into the ds summary output.

ER in dht2

88/1842.79
[1] 0.04775368

However, the relation between ER, se.ER and cv.ER makes more sense in the ds model summary

0.01181436/0.04133635 # se.ER/ER
[1] 0.2858104 # cv.ER

The same relationship does not hold in dht2

0.011/0.048 # se.ER/ER
[1] 0.2291667 # cv.ER (reported as 0.237 in the table)

Originally posted by @LHMarshall in #194