Hi
On 22 Apr 2006 at 23:29, Bob Green wrote:
Date sent: Sat, 22 Apr 2006 23:29:02 +1000
To: r-help@stat.math.ethz.ch
From: Bob Green [EMAIL PROTECTED]
Subject:[R] Missing values detected when there are no missing
values
I am hoping for some advice on the following matters.
I have a csv data file with 153 variables x 92 rows. To determine
what the variables looked like I ran the summary command. One
variable had a large number of missing values 54/92. For some
reason, all subsequent 74 variables are reported as having 92 NA
values, irrespective of whether the original csv variable was complete
or not.
I have not seen any answer yet so I try to shot one.
first how do you know there is not any missing value in your csv
file?
Below are the commands I ran:
study1dat - read.csv(c:\\study1r.csv,header=T)
attach(study1dat)
names(study1dat)
summary(study1dat)
You showed what you did but we can not know much about study1r.csv so
my answer is only guess. Let's assume that csv was constructed from
Excel, couldn't be a problem in its construction? Some space in some
columns which are not seen in Excel but are exported to csv and read
to R as NA values?
What does str(study1dat) say about your data?
And are there really , vaues separators and . decimal separators
as required by read.csv?
The second puzzling issue, is that one variable with no missing values
is reported in R as having 3 missing values, whereas there are no
missing values in the csv file. The only errors in reading the data I
received were:
Not when reading but when attaching data frame. Names in your data
frame are same as names of some functions in mentioned packages,
which is not an error, R just tell you that this had happened and you
shall be avare of it.
HTH
Petr
The following object(s) are masked from package:stats :
time
The following object(s) are masked from package:graphics :
screen
The following object(s) are masked from package:datasets :
sleep
The following object(s) are masked from package:base :
pipe
I am happy to send the csv file if required. Any advice that can
offered is appreciated,
Bob
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Petr Pikal
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