On Jul 25, 2012, at 9:48 AM, Marion Wenty wrote:
Dear list members,
I have got another problem. I imported an SPSS file with the Memisc
package
using the following commands:
mz <- spss.system.file("myspssfile.sav")
mz <- subset(mz,select=c(
bsex,balt,xurb,dtaet,kartab,bgeb,boseit,bgeblan,xnuts2,kausb,xerwstat,
asbper,asbhh,ajahr,aquartal,bstaat,xwieoft,gew1,apkz,bpkzm,bpkzv))
The memisc package help file for spss.system.file() (actually labeled
"importers") says that there is an S4 method for "subset" there does
not seem to be a separate page describing its behavior or values
Afterwards I checked the measurements of the variables
What does that phrase mean? What code did you actually use?
and they are all
right for most of them (e.g. the variable containing the sex of a
person is
"nominal" and the variable containing the year is "interval"). For
two of
the variables the measurement is not o.k, though. They exclusively
contain
numbers in the SPSS file (e.g. the age of a person) - and no NAs -
but have
got the measurement "nominal"!
Hard to say. There is no R storage mode that is called "nominal".
Perhaps some sort of memisc-specific terminology? Or perhaps something
in your spss dataset... to which you have not provided access? Or the
default setting for the spss.system.file access method? I know that
the Hmisc package's describe() function will report out a variable as
though it were categorical if there are only 8 or fewer unique values.
After looking at further help pages and trying the help pages code, I
am guessing that some of my puzzlement might be answered by reading
the vignettes, but you can do that yourself.
Here's a hackish guess ... try:
?measurement
measurement(mz$age_variable) <- "interval"
# where age_variable is the unstated item in that "select" list
--
David Winsemius, MD
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