Dear colleagues,
What did I not understand ?
->my intention
I want to create a new variable:
In plain language:
If someone is taking anithypertensive treatment (med.hyper==1)
table(med.hyper)
med.hyper
0 1
472 97
I want to subtract 5 mmHg (rr.dia.2m-5) from the measured diastolic
blood pressure (rr.dia.2m)
if not treated - the value of the measured diastolic blood pressure
should remain the same
->my code (data frame is attached !)
rr.dia2.corr<-if(med.hyper==1)
{
rr.dia.2m-5
} else
{
rr.dia2.corr==rr.dia.2m
}
R warning
Warnmeldung:
In if (med.hyper == 1) { :
Bedingung hat Länge > 1 und nur das erste Element wird benutzt
"Only first condition is use"
which you can see from the result (simply 5 mm was subtracted and the
second condition was taken into account)
> describe(rr.dia.2m)
rr.dia.2m
n missing unique Mean .05 .10 .25 .50
.75 .90 .95
546 26 110 85.32 67.00 71.50 77.62 84.50
92.00 99.25 105.00
lowest : 45.0 57.0 60.0 61.0 62.0, highest: 127.5 128.5 129.5 142.5
146.5
> describe(rr.dia2.corr)
rr.dia2.corr
n missing unique Mean .05 .10 .25 .50
.75 .90 .95
546 26 110 80.32 62.00 66.50 72.62 79.50
87.00 94.25 100.00
lowest : 40.0 52.0 55.0 56.0 57.0, highest: 122.5 123.5 124.5 137.5
141.5
--------------------
OS windows
R version 2.10.1 (2009-12-14)
attached R modules: design+hmisc
------------------
Thank you so much
Peter
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