tabulateRows

a sorted data.frame holding ordered factors in every column

observed

Like <code>tabulate</code> but entire rows are the unit of tabulation.
The data.frame is not sorted, but must be sorted already.

The purpose of this package is to factor out logic and
        math common to Item Response Theory fitting, diagnostics, and
        analysis. It is envisioned as core support code suitable for
        more specialized IRT packages to build upon. A version 1.0 will
        offer optimized, low-level functions to map parameters to
        response probabilities for a wide variety of dichotomous and
        polytomous item models.

tabulateRows: Tabulate data.frame rows

Description

Usage

Arguments

See Also