← All cohorts
A population, from the archive
Tank Ship, built 2010s, any size
2,460 hulls · 2460 of its 2460 hulls have no operator on file
What the record shows for this population
| Hulls in the cohort | 2,460 |
| Median recorded inspections per hull | 10 |
| Median recorded deficiencies per hull | 1 |
| Hulls with any recorded deficiency | 55% |
| Hulls appearing in any casualty investigation | 1% |
Medians, not means: a single hull with hundreds of recorded deficiencies
would drag a mean into implying a severity the record does not support. Every figure is a
count or a median of what the Coast Guard wrote down.
What this is not
This is a fact about a population, not a judgement about any vessel or any operator.
Maury does not score, rate, or grade vessels, and it publishes no statistic for a named
operator. This cohort is published because no single operator’s record can be
read out of it: 2460 of its 2460 hulls have no operator on file. A cohort that fails that test is not published and is
not widened until it passes.
A higher median can mean hulls were inspected more often rather than found worse. Maury’s own published finding is that recorded deficiency history shows no measurable relationship to later casualties.
A higher median can mean hulls were inspected more often rather than found worse. Maury’s own published finding is that recorded deficiency history shows no measurable relationship to later casualties.
Cohort definition
Vessel type as the Coast Guard classes it; build year from the record; overall length from
the USCG vessel service where the band is not “any size”. Recomputed from the
archive every time the site is built. Coverage, known gaps and
method.