For the R Programming programming assignment 2: adding a function to calculate the pollutant mean based on a number observations coming from monitors - data in the  data/ProgrammingAssignment2/specdata subdirectory
For the R Programming programming assignment 2: adding a function to calculate the correlation between sulfate and nitrate pollutant observations coming from monitors - data in the  data/ProgrammingAssignment2/specdata subdirectory
For the R Programming programming assignment 2: adding a function to calculate the number of valid observations per monitor station - excluding NAs. Data in the  data/ProgrammingAssignment2/specdata subdirectory