Post-hoc analysis

In the design and analysis of experiments, post-hoc analysis (from Latin post hoc, "after this") consists of looking at the data—after the experiment has concluded—for patterns that were not specified a priori. It is sometimes called by critics data dredging to evoke the sense that the more one looks the more likely something will be found. More subtly, each time a pattern in the data is considered, a statistical test is effectively performed.

Precisão e Exactidão ?

Precisão ?: Resultados dentro dos valores do controlo interno. Podem não estar exactos (correctos) mas saem sempre dentro dos valores estabelecidos como normais/anormais num dado equipamento.

Exactidão ?: Resultados dentro dos valores do controlo externo. Em comparação com outros equipamentos os resultados são fiáveis para extrapolar para os doentes.

ad hoc

Ad hoc is a Latin phrase meaning "for this".

It generally signifies a solution designed for a specific problem or task, non-generalizable, and not intended to be able to be adapted to other purposes (compare a priori). Common examples are organizations, committees, and commissions created at the national or international level for a specific task.