first version of 2nd method working - at least on one file
second version is looping, and a bunch of testing notes
method 2 done -- and matches results from method 1
added notes for how to get mean from a single year using postreSQL
frequency table using postgres is working
added notes on how to use sed to fix problem where blanks were not being read as NAs when loading data into table
Updated Postgres commands so that we now also include columns with carrier and origin and destination
all methods working, and extraneous notes removed and placed in new file. Also, added plot of results from three methods.
cleaned up all notes, comments improved, graphs added
note file added