Hi All,
I have a small dataset named das (43 cases) in which I am trying to
create a binary outcome (1/0) based on the following code:
if (das$age>65 && das$bmi>30) {das$danger<-1} else das$danger<-0
I am setting a flag called 'danger' to 1 of the subject is over 65
and has a BMI > 30.
I find that my statement evaluates the first record in the data.frame
and then carries that assignment for all. I detected this as I played
around with the values and found that the T/F status of the first
record was always carried dowqn. I have gotten this to work with an
elseif construction, but would like to know what is happening here.
Thanks,
Gerard
Using: Windows Vista and R 2.61
Code and output:
das<- sasxport.get("c:\\personal\\r\\das.xpt")
if (das$age>65 && das$bmi>30) {das$danger<-1} else das$danger<-0
attach(das)
das
The following object(s) are masked from das ( position 3 ) :
age bmi day id male sex status
id age sex bmi status day male danger
1 33001 35 M 27.5 0 365 1 0
2 33002 29 M 34.9 1 22 1 0
3 33003 41 F 23.6 0 365 0 0
4 33004 55 F 27.0 0 365 0 0
5 42001 37 M 39.0 0 365 1 0
6 42002 53 M 26.6 1 124 1 0
7 42003 46 F 45.4 1 287 0 0
8 42004 35 F 36.2 0 365 0 0
9 42005 38 F 24.6 0 365 0 0
10 42006 58 F 28.0 0 365 0 0
11 42007 27 M 25.0 0 365 1 0
12 42008 65 F 24.6 0 365 0 0
13 42009 25 F 28.0 0 365 0 0
14 43001 66 M 27.8 0 365 1 0
15 43002 57 F 34.0 0 365 0 0
16 43003 45 F 38.1 0 365 0 0
17 43004 33 F 53.3 1 62 0 0
18 43005 56 F 36.5 0 365 0 0
19 43006 31 F 22.4 1 1 0 0
20 43007 53 F 32.2 1 21 0 0
21 55001 51 M 29.2 0 365 1 0
22 55002 33 F 18.7 0 365 0 0
23 55003 40 F 30.3 0 365 0 0
24 55004 67 M 31.9 0 365 1 0 <- Problem case should
=1 for danger
25 55005 41 F 35.0 0 365 0 0
26 55006 44 F 37.3 0 365 0 0
27 55007 67 M 28.4 1 1 1 0
28 55008 65 F 28.8 0 365 0 0
29 55009 76 M 18.8 1 225 1 0
30 55010 75 F 21.1 1 39 0 0
31 63001 30 F 24.9 0 365 0 0
32 63002 36 F 47.2 1 377 0 0
33 63003 45 F 32.0 0 365 0 0
34 63004 49 F 32.3 0 365 0 0
35 63005 41 F 20.2 0 365 0 0
36 63006 60 F 28.2 0 365 0 0
37 63007 33 F 24.5 0 365 0 0
38 63008 36 F 28.4 1 56 0 0
39 63009 31 F 22.1 0 365 0 0
40 63010 77 M 26.6 1 9 1 0
41 63011 41 F 32.0 0 365 0 0
42 63012 40 F 38.5 1 92 0 0
43 63013 27 M 20.6 0 365 1 0
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