Krippendorff's alpha for unitizing

Usage

reliability_alpha_u(unitizations, L)

Arguments

unitizations

A list of data.frames, one per observer. Each must have columns start, end (1-based, inclusive character positions), and value (the category assigned to the segment).

L

Integer length of the continuum.

Value

A list with elements:

method

"alpha_u".

value

Numeric – _u_alpha_nominal (overall agreement on both boundaries and codes; section 12.6.3, eq. 34).

binary

Numeric – |_u_alpha_binary (boundary-only; section 12.6.4, eq. 35).

cu_nominal

Numeric – _cu_alpha_nominal (coding given unitization; section 12.6.5, eqs. 36–37).

ci_lower, ci_upper

NA_real_ (uniform shape).

per_value

Data.frame with columns value, alpha, coverage – per-value reliability _(k)u_alpha_nominal (section 12.6.6, eq. 38).

n_observers

Number of observers (m).

L

Continuum length.

Details

Native implementation of the _u_alpha family for two or more unitizations of a common continuum (Krippendorff, 2019, section 12.6). One call computes all variants – overall (_u_alpha_nominal), boundary-only (|_u_alpha_binary), coding-conditional (_cu_alpha_nominal), and per-value (_(k)u_alpha_nominal).

References

Krippendorff, K. (2019). Content Analysis: An Introduction to Its Methodology (4th ed.). Sage.