How many processes have Poisson counts?

How many species have mass M?

Within large taxonomic assemblages, the number of species with adult body mass M is characterized by a broad but asymmetric distribution, with the largest mass being orders of magnitude larger than the typical mass. This canonical shape can be explained by cladogenetic diffusion that is bounded below by a hard limit on viable species mass and above by extinction risks that increase weakly with ...

Perspective. How many women have osteoporosis?

Osteoporosis is widely viewed as a major public health concern, but the exact magnitude of the problem is uncertain and likely to depend on how the condition is defined. Noninvasive bone mineral measurements can be used to define a state of heightened fracture risk (osteopenia), or the ultimate clinical manifestation of fracture can be assessed (established osteoporosis). If bone mineral measur...

How many doctors should Sri Lanka have?

How many old people have ever lived?

BACKGROUND Uninformed generalizations about how many elderly people have ever lived, based on a poor understanding of demography, are found in a surprising number of important publications. OBJECTIVE We extend the methodology applied to the controversial question “how many people have ever been born?” initiated by Fucks, Winkler, and Keyfitz, to the proportion of people who have ever reached a ...

Atypical Kawasaki syndrome: how many symptoms have to be present?

A 20 year old woman with acute myocardial infarction exhibited a huge aneurysm of the left main coronary artery that was occluded by a large intraluminal thrombus. After exclusion of other vascular or systemic diseases, atypical Kawasaki syndrome was diagnosed. Other major symptoms usually required for this diagnosis were absent. As patients with Kawasaki syndrome in childhood are surviving lon...