Item Response Theory and Computerized Adaptive Testing Functions

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Documentation for package ‘irt’ version 0.1.3

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$-method Get slots from an 'Item-class' object.
$-method Get slots of the an 'Item-class' object.
$-method Access slots of a 'Testlet-class' object
$<--method Set values to parameters or components of 'Item-class' object
$<--method Set values to parameters or components of 'Item' class.
$<--method Set values to parameters or components of 'Item' class.
add_misc Add or change a named value to 'misc' slot of an 'Item-class', 'Itempool-class' or 'Testlet-class' object.
add_misc-method Add or change a named value to 'misc' slot of an 'Item-class', 'Itempool-class' or 'Testlet-class' object.
as.data.frame.Item Convert an 'Itempool-class' object into a 'data.frame'.
as.data.frame.Itempool Convert an 'Itempool-class' object into a 'data.frame'.
as.data.frame.Testlet Convert an 'Itempool-class' object into a 'data.frame'.
as.Itempool Coerce a given object to 'Itempool-class' object
as.list.Itempool This function converts Itempool objects to a list object
biserial Calculate biserial correlation
c-method Concatenate 'Item', 'Itempool' or 'Testlet' objects and return an Itempool object.
calculate_exposure_rates Calculate exposure rate of items for CAT
calculate_overlap_rates Calculate overlap rate of items for CAT
cat_sim Computerized Adaptive Test (CAT) Simulation
cat_sim_fast Computerized Adaptive Test (CAT) Simulation (Parallel Computing)
create_cat_design Computerized Adaptive Test (CAT) Simulation Design
dif Evaluate Differential Item Functioning (DIF) of a test
distractor_analysis Distractor Analysis Function
est_ability Ability Estimation of an examinee
est_bilog Run BILOG-MG in batch mode
generate_ip Generate a random 'Itempool' object
generate_item Generate a random Item object
generate_testlet Generate a random Testlet object
get_cat_administered_items Get administered items from a CAT output
get_cat_response_data Extracts the response data of CAT output.
get_max_possible_total_score Calculate the maximum score of a set of items
info Calculates the information of an "Item" object
info-method Calculates the information of an "Item" object
ipd Item Parameter Drift
irt A Collection of Item Response Theory (IRT) and Computerized Adaptive Testing (CAT) Functions
is.Item Check whether an object is an 'Item-class'
is.Itempool Check whether an object is an 'Item-class'
is.Testlet Check whether an object is an 'Item-class'
item Create an 'Item' object
Item-class An S4 class to represent an Item
itempool Create an 'Itempool' object
Itempool-class An S4 class to represent an Itempool
item_analysis Item Analysis Function
item_fit Calculate item-fit indices
length-method Find the length of an 'Itempool-class' object
person_fit Calculate person-fit indices
person_fit-method Calculate person-fit indices
plot.Item Plot Item Characteristic Curve of an 'Item' object
plot.Itempool Plot Item Characteristic Curves or Test Characteristic Curve of an 'Itempool' object
plot_distractor_icc Plot Empirical Item or Test characteristic curve
plot_empirical_icc Plot Empirical Item or Test characteristic curve
plot_info Plot Item Information Function
plot_resp_loglik Plot the Log-Likelihood of a response string
prob Calculate the probability of a correct response
prob-method Calculate the probability of a correct response
resp_lik Likelihood of a response string
resp_lik-method Likelihood of a response string
resp_loglik Log-likelihood of a Response String
resp_loglik-method Log-likelihood of a Response String
rsss Convert raw score to scale score and vice versa
sim_resp Generate responses for a given model
sim_resp-method Generate responses for a given model
summary.cat_output Summarizes the raw output of cat_sim
testlet Creates a 'Testlet-class' object
Testlet-class An S4 class to represent a Testlet