Hi,
I'm not really even sure how to phrase this question, so here is a
sample of exactly what I want to do. In the following data set I would
like to select the entry from the group of samples 1 that has the
lowest DOpt. Do the same for the group of samples 2. I would then like
to get the average for the CFU/100ml values of the two samples together
but only for the two values that correspond to the lowest DOpt from
each of the sample sets. Basically I can group based on one field to
determine the record I want to use, but by grouping I loose the detail
of that record. Any suggestions are greatly appreciated.
Location Sample Volume ml Count CFU/100ml DOpt
BL 1 0.1 1 1000 29
BL 1 1 13 1300 17
BL 1 10 75 750 45
BL 2 0.1 2 2000 28
BL 2 1 18 1800 12
BL 2 10 93 930 63