On Sep 24, 2009, at 3:06 AM, David Winsemius wrote:
On Sep 23, 2009, at 5:11 PM, ws wrote:
Webb Sprague <webb.sprague <at> gmail.com> writes:
xtabs(~wkhp, x, exclude=NULL, na.action=na.pass)
wkhp
20 30 40 45 60 <NA>
1 1 10 1 3 4
now this doesn't even work !!!!
Try:
wtf <- factor(x, levels(c(levels(wtf), NA), exclude=NULL)
xtabs (~ wtf, exclude=NULL, na.action=na.pass)
Note: that will mean that sum(is.na(wtf)) will return 0 and
is.na(wtf)<- will no longer have any valid targets.
-- David
table(wtf, exclude=NULL)
wtf
[0,10) [10,20) [20,30) [30,40) [40,50) [50,60)
[60,70) [70,80)
8562 15297 9666 6659 3583 667
1357 238
[80,90) [90,100) [100,110) [110,120) [120,130) [130,140) [140,150)
[150,160)
61 311 57 19 95 7
3 111
[180,190) <NA>
161 62161
Compare:
xtabs (~ wtf, exclude=NULL, na.action=na.pass)
wtf
[0,10) [10,20) [20,30) [30,40) [40,50) [50,60)
[60,70) [70,80)
8562 15297 9666 6659 3583 667
1357 238
[80,90) [90,100) [100,110) [110,120) [120,130) [130,140) [140,150)
[150,160)
61 311 57 19 95 7
3 111
[180,190)
161
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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