Missing Values in Logical Expressions
Hm Based on Jim's data your construction gives me correct result.
Umsatz_2011<-c(1,2,3,4,5,NA,7,8,NA,10)
Kunde_2011<-rep(0:1,5)
Check_Kunde_2011 <- ifelse(is.na(Umsatz_2011) == TRUE & Kunde_2011 == 1, 1, 0)
Check_Kunde_2011 <- factor(Check_Kunde_2011, levels = c(1,0), labels = c("Check", "OK"))
table(Check_Kunde_2011)
Check_Kunde_2011
Check OK
1 9
So I presume that the problem lies in your data.
You should provide some sample of your data either by posting result of
str(yourdata)
or
dput(head(yourdata))
if you want some advice why with correct code you did not get appropriate result.
Instead ifelse you can also use
Check_Kunde_2011 <- (is.na(Umsatz_2011)&(Kunde_2011==1))*1
to get desired 0/1 vector.
Cheers
Petr
-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of
G.Maubach at weinwolf.de
Sent: Tuesday, April 26, 2016 10:10 AM
To: r-help at r-project.org
Subject: [R] Missing Values in Logical Expressions
Hi All,
I need to evaluate missing values in my data. I am able to filter these values
and do simple statistics on it. But I do need new variables based on variables
with missing values in my dataset:
Check_Kunde_2011 <- ifelse(is.na(Umsatz_2011) == TRUE & Kunde_2011 ==
1, 1, 0)
Check_Kunde_2011 <- factor(Check_Kunde_2011, levels = c(1,0), labels =
c("Check", "OK"))
The new variable is not correctly created. It contains no values:
table(Check_Kunde_2011)
< table of extent 0 >
I searched the web but could not find a solution.
How can I work with variables and missing values in logical expressions?
Where could I find something about this?
Kind regards
Georg
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