Your Friday investigation needs an industry ranking. On Thursday evening, industry.value_counts() looks reassuringly tidy. The uncomfortable question is whether those bars measure hiring demand or visibility in a recent-results feed.

Totaljobs serves anonymous searches newest-first. Relevance ordering requires a signed-in session and can't be combined with the filters, so the Actor always returns newest-first results.

A capped collection therefore selects through posting recency. Recently posted adverts can enter the collection while older vacancies remain open beyond its reach. A chart can describe the collected adverts perfectly and still answer the wrong question.

Fresh adverts get more chances to appear

The tempting assumption is that matching an occupational keyword produces a representative cross-section of that occupation.…