Bruce, Try something like this
df$limlo <- ifelse(df$BG>=100, df$BG-(df$BG*0.15), df$BG-15) df$limhi <- ifelse(df$BG>=100, df$BG+(df$BG*0.15), df$BG+15) plot(seq(df$BG), df$BG, ylim=range(df$limlo, df$limhi)) arrows(seq(df$BG), df$limlo, seq(df$BG), df$limhi, length=0.1, angle=90, code=3) Jean On Tue, May 7, 2013 at 8:54 AM, Bruce Miller <batsnc...@gmail.com> wrote: > Hi all, > > I am trying to set up logical function(s) to deal with two adjustments > to a blood glucose value. > I have been dinking around in Excel and assume this will be much easier > in R. > > DF is date-time, BG value in mg/dL,test strip > 4/3/13 19:20 105 Aviva-491350 > 4/4/13 21:03 74 Aviva-491350 > 4/6/13 17:40 81 Aviva-491640 > 4/6/13 17:40 82 Aviva-491350 > 4/6/13 22:48 106 Aviva-491640 > 4/6/13 22:48 102 Aviva-491350 > 4/7/13 5:32 87 Aviva-491350 > 4/7/13 5:32 103 Aviva-491640 > > > What I need are the high and low ranges based on "acceptable" standards > of the measured values. > > The logical expressions need to be > IF BG =>100 then "High limit" would = (BG+(BG*.15)) > IF BG =>100 then "Low limit" would = (BG-(BG*.15)) > and > IF BG <100 then "High limit" would = (BG+15) > IF BG <100 then "Low limit" would = (BG-15) > > The standards are written as: 95% of the individual glucose results > shall fall within Ä 15 mg/dL of the reference results at glucose > concentrations less than 100 mg/dL and within Ä 15% at glucose > concentrations greater than or equal to 100 mg/dL. > > Then I need to plot the measured value and also show the high & low > "acceptable" values. > > Thanks for any who respond. > > Bruce > > > [[alternative HTML version deleted]] > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > [[alternative HTML version deleted]]
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
