This function is used to calculate ideal response patterns for all possible attribute profiles based on the DINA model (Junker & Sijtsma, 2001) or conjunctive-type cognitive diagnostic models.

1 | ```
eta(K, J, Q)
``` |

`K` |
The number of attributes. |

`J` |
The number of items. |

`Q` |
A required |

A *2^K \times J* binary matrix will be returned. Each row of ideal response patterns is corresponding to each of the *2^K* possible attribute patterns, which can be obtained from `alpha`

.

Junker, B., & Sijtsma, K. (2001). Cognitive Assessment Models with Few Assumptions, and Connections with Nonparametric Item Response Theory. *Applied Psychological Measurement, 25*(3), 258-272.

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