lazy.girt: Some generalized IRT functions for lazy boys and girls

Description

The following are the classes of the functions.

Item Parameter Estimation and Equating

• guIRT: Item Parameter Estimation of Unidimensional IRT
  
  est_thetaphi: Estimation of Theta

Item Response Functions

• girf Calculation of Item Response Function
  
  

• gicrfB: Calculation of item Response Function of Binary Logisticitems

• gicrfG: Calculation of item Response Function of Graded Responseitems

Derivative of Item Response Functions

• dgirf_p: Calculation of the Derivative of item Response Function with respect to Item Parameters

Utility Functions

• checkparam: Checking Parameter Data Frame

• gendata_gIRT: Generation of Simulated Item Response Data

• generate_thetaphi: Genration of theta-phi grid

• dummy_expand: dummy_expand the compressed item response data.

• dummy_compress: compress the uncompressed item response data.

• find_mode: Find the Mode of icrf

• find_intersection: Find the Intersection of icrfs

• gordinal_reg: Oridinal Regression (used in uIRT)
  

• dgbeta: pdf of the generalized beta distribution.

• rgbeta: random number from the generalized beta distribution.

• ab2ms: get (mean,std) from (a,b) of beta distribution.

• ms2ab: get (alpha, beta) from (mean, std) of beta distribution.

Data

• param_EQ5: Binary Item Parameter Data Frame

• param_EQ7: Binary Item Parameter Data Frame

• param_EQ9: Binary Item Parameter Data Frame

• param_EQS5: Binary Item Parameter Data Frame

• param_EQS7: Binary Item Parameter Data Frame

• param_EQS9: Binary Item Parameter Data Frame
  

• Uc_5: All possible item responses of 5 item tests

• Uc_7: All possible item responses of 7 item tests

• Uc_9: All possible item responses of 9 item tests