Dear R experts,
I am trying to do linear extrapolation on a dataset like the attached document.
I looked at the approx and approxfun function that seem to do this function,
but not fully understand them. I was wondering if someone could help with
writing commands to do the following based on the attached file's example:
ID#1 and ID #2 both have response parameters ("MEASUREMENT" in the Book1.txt
file) for a given time point ("TIME (hours)" in the Book1.txt file). Using
linear extrapolation I would like to be able to compute the percent time spent
in the "MEASUREMENT" range of 9 to 10, for ID#1 and ID#2, together
and individually.
in the attached simple example, if I did the calculation then the results
would be:
1; 66% for ID #1 and 100% for ID#2, individually. This is the 1st value I
would like to compute
2; Combined together the results would be the average of 66% and 100%, which
equals to 83%, This is the 2nd value I would like to compute
all of your help is apreciated,
thanks,
AndrasID# TIME (hours) MEASUREMENT
1 0 8
1 24 9
1 48 10
1 72 9
2 0 9
2 24 10
2 48 10
2 72 10
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