Displaying 1 result from an estimated 1 matches for "index_pollut".
2008 Jun 24
2
subscripting in data frames with NA
Dear list:
Given
> str(b3)
'data.frame': 159 obs. of 6 variables:
$ index_pollution : num 8.228 10.513 0.549 0.915 10.416 ...
$ position_descrip: chr "2" "2" "2" NA ...
$ position_geo : chr "3" "0" "3" "3" ...
$ institution : Factor w/ 3 levels "digesa","mem",..: 3 3 3 3...