Data Quality Control



Twelve remeasured plots on Transect 1 with differences calculated for the first plot.
 
Plot 1 Species Jan. dbh Jan. vigor March dbh March vigor Dbh differences
OSVI 12.6 0 21.8 0 0.2
QUAL 62.2 0 62.4 0 0.2
ACRU 7.6 0 7.6 0 0
ACRU 9.5 0 9.1 Sick 0.4
ACRU 9.8 0 9.4 Sick 0.4
ACRU 18.0 0 17.4 0 0.6
ACRU 14.5 5 13.6 5 0.9
BELE 22.9 0 22.6 0 0.3
BELE 16.0 0 16.1 0 0.1
        Average error:

0.3

In some cases, trees were not recorded in either the January or March data. Many of these were dead or snags, suggesting that a dead tree more easily escapes attention than a live tree. Also, many of the missing trees had very small dbhs and could have been left out of the record on one of the days because the measurement may have been below 4.6, our cutoff value. A third possibility for the missing trees may be that they were thought to be in the adjacent transect (Transect 2) on one day of data collection and thought to be in Transect 1 on the other day. Otherwise, the measurements and vigor assessments were very close between the two days.