Description Usage Arguments See Also Examples
Objects of class item
are data vectors with additional information
attached to them like “value labels” and “user-defined missing values”
known from software packages like SPSS or Stata.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | ## The constructor for objects of class "item"
## more convenient than new("item",...)
## S4 method for signature 'numeric'
as.item(x,
labels=NULL, missing.values=NULL,
valid.values=NULL, valid.range=NULL,
value.filter=NULL, measurement=NULL,
annotation=attr(x,"annotation"), ...
)
## S4 method for signature 'character'
as.item(x,
labels=NULL, missing.values=NULL,
valid.values=NULL, valid.range=NULL,
value.filter=NULL, measurement=NULL,
annotation=attr(x,"annotation"), ...
)
## S4 method for signature 'logical'
as.item(x,...)
# x is first coerced to integer,
# arguments in ... are then passed to the "numeric"
# method.
## S4 method for signature 'factor'
as.item(x,...)
## S4 method for signature 'ordered'
as.item(x,...)
## S4 method for signature 'POSIXct'
as.item(x,...)
## S4 method for signature 'double.item'
as.item(x,
labels=NULL, missing.values=NULL,
valid.values=NULL, valid.range=NULL,
value.filter=NULL, measurement=NULL,
annotation=attr(x,"annotation"), ...
)
## S4 method for signature 'integer.item'
as.item(x,
labels=NULL, missing.values=NULL,
valid.values=NULL, valid.range=NULL,
value.filter=NULL, measurement=NULL,
annotation=attr(x,"annotation"), ...
)
## S4 method for signature 'character.item'
as.item(x,
labels=NULL, missing.values=NULL,
valid.values=NULL, valid.range=NULL,
value.filter=NULL, measurement=NULL,
annotation=attr(x,"annotation"), ...
)
## S4 method for signature 'datetime.item'
as.item(x,
labels=NULL, missing.values=NULL,
valid.values=NULL, valid.range=NULL,
value.filter=NULL, measurement=NULL,
annotation=attr(x,"annotation"), ...
)
|
x |
for |
labels |
a named vector of the same mode as |
missing.values |
either a vector of the same mode as |
valid.values |
either a vector of the same mode as |
valid.range |
either a vector of the same mode as |
value.filter |
an object of class |
measurement |
level of measurement; one of "nominal", "ordinal", "interval", or "ratio". |
annotation |
a named character vector,
or an object of class |
... |
further arguments, ignored. |
annotation
labels
value.filter
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | x <- as.item(rep(1:5,4),
labels=c(
"First" = 1,
"Second" = 2,
"Third" = 3,
"Fourth" = 4,
"Don't know" = 5
),
missing.values=5,
annotation = c(
description="test"
))
str(x)
summary(x)
as.numeric(x)
test <- as.item(rep(1:6,2),labels=structure(1:6,
names=letters[1:6]))
test
test == 1
test != 1
test == "a"
test != "a"
test == c("a","z")
test != c("a","z")
test
test
codebook(test)
Test <- as.item(rep(letters[1:6],2),
labels=structure(letters[1:6],
names=LETTERS[1:6]))
Test
Test == "a"
Test != "a"
Test == "A"
Test != "A"
Test == c("a","z")
Test != c("a","z")
Test
Test
as.factor(test)
as.factor(Test)
as.numeric(test)
as.character(test)
as.character(Test)
as.data.frame(test)[[1]]
|
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