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2009 Nov 05
2
Using a by() function to process several regression (lm()) functions
...ns in a chamber and are used to measure into rates, usually (not not always), four or five observations per chamber. Data are from several sites and multiple dates. I'd like to run a regression to calculate the rate of emissions, for each date and site. The regression is using concentration ~ Sample_interval (which is in seconds). lm(Concentration ~ Sample_interval, data=df) The data.frame looks something like this: Date Time Site Sample_interval Concentration 10/03/09 5:00 Site 1 0...