Reliability & Agreement

Before trusting a score built from multiple items, or a rating made by multiple people, it is worth asking how consistent those measurements actually are. These tools quantify that consistency directly, showing the data layout, sample size, and per-item or per-rater summaries used to compute it.

A reliability statistic describes internal consistency or agreement. It does not by itself establish that a scale or rating measures the right underlying construct, whether the items or raters involved are truly comparable, and whether the chosen model actually fits your specific study are left for you to verify.