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watered
2011 Jan 17
4
Extraction and replacement of data in a data frame
...ur clients.
The groundwater levels are measured by pressure sensors lowered into the
monitoring wells. After a certain time, the sensors were lowered further
into the well, thus creating a disparity in the measurements.
The data frame I import into R looks something like this:
Date Waterhead (mm)
10-01-01 100
10-01-02 105
10-01-03 101
10-01-04 99
10-01-05 85
10-01-06 200
10-01-07 199
10-01-08 195
10-01-09 185
10-01-10 170
For example, on the 10-10-06, the sensor was lowered by 115 mm.
When I download the csv file, I download the data from the begi...