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 ±15 mg/dL of the reference results at glucose
concentrations less than 100 mg/dL and within ±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
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