LSMfit                  Fitting Latent Space Item Response Models using
                        Joint Maximum Likelihood Estimation
LSMrotate               Rotate the person and item latent space
                        parameter matrices to an echeleon structure
LSMselect               Selecting the Latent Space Dimensionality using
                        K-fold Cross-Validation
LSMsim                  Simulating Data according to the Latent Space
                        Item Response Model
