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hobbstime
2006 Mar 20
2
subsetting and NAs
R-help,
I'm getting some unexpected behavior with subsetting a data frame
(aircraft flight data) that I can't sort out.
Here is a simplified version of my data frame and problem:
> flight
FlightID TailNo FlightDate HobbsTime FlightCost Date year
1 4497 6009K <NA> 2.2 330.0 <NA> NA
2 4498 6009K <NA> 0.8 120.0 <NA> NA
3 4499 6009K <NA> 0.9 135.0 <NA> NA
4 4500 6009K...