What is measured, and where it is not

Statistical offices decide what to collect and what to publish, for reasons that are legal, historical, practical or political, so the same question can be answerable in one country and not in another. Here each topic is laid out the same way: what a source that was read says is collected, crossed with what, under what law, where the answer is missing, and what would have to come with a new measure so it is not misread. Solon describes and proposes; it does not rate offices or characterise people.