Andras Farkas
2012-May-21 11:36 UTC
[R] linear extrapolation using data from imported text file
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, ? Andras -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: Book1.txt URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20120521/a2b76c39/attachment.txt>