subset-response_set: Subset 'Response_set' objects

In irt: Item Response Theory and Computerized Adaptive Testing Functions

Subset Response_set objects

Description

Subset Response_set objects

Usage

## S4 method for signature 'Response_set,ANY,missing'
x[i, j, ..., drop = TRUE]

Arguments

x	A Response_set-class object from which to extract element(s) or in which to replace element(s).
i	indices specifying elements to extract or replace.
j	This will not be used in Response_set-class objects.
...	Parameters to be passed to the function.
drop	(From R manual:) For matrices and arrays. If TRUE the result is coerced to the lowest possible dimension (see the examples). This only works for extracting elements, not for the replacement. See drop for further details.

Value

An Response_set-class object.

Author(s)

Emre Gonulates

Examples

resp_set <- sim_resp(ip = generate_ip(n = 12), theta = rnorm(10),
                     output = "response_set")
resp_set[1]
# Create an Response_set using the first and third element:
resp_set[c(1, 3)] # Order is important
resp_set[c(3, 1)]
resp_set[-2]
resp_set[c(TRUE, FALSE, TRUE)]
resp_set[c("S2", "S1")]
# Recycle, i.e. get all elements
resp_set[TRUE]
# Recycle, i.e. get all even elements
resp_set[c(FALSE, TRUE)]

# Use logical expressions
resp_set[resp_set$examinee_id %in% c("S3", "S8")]

irt documentation built on Nov. 10, 2022, 5:50 p.m.