Quantifying risk of overharvest when implementation is uncertain

What is certain when the stroke etiology is uncertain?

Quantifying the risk of error when interpreting funnel plots

BACKGROUND Funnel plots are widely used to investigate possible publication bias in meta-analyses. There has, however, been little formal assessment of whether a visual inspection of a funnel plot is sufficient to identify publication bias. METHODS Visual assessment of bias in a funnel plot is quantified using two new statistics: the Imbalance and the Asymmetry Distance, both intended to repl...

When every $P$-flat ideal is flat

In this paper‎, ‎we study the class of rings in which every $P$-flat‎ ‎ideal is flat and which will be called $PFF$-rings‎. ‎In particular‎, ‎Von Neumann regular rings‎, ‎hereditary rings‎, ‎semi-hereditary ring‎, ‎PID and arithmetical rings are examples of $PFF$-rings‎. ‎In the context domain‎, ‎this notion coincide with‎ ‎Pr"{u}fer domain‎. ‎We provide necessary and sufficient conditions for‎...

Monkeys overharvest shellfish

The use of stone tools by macaques in Thailand has reduced the size and population density of coastal shellfish: previously it was thought that overharvesting effects resulted from human activity alone.

Optimal Investment and Consumption Decisions when Time-Horizon is Uncertain

Many investors do not know with certainty when their portfolio will be liquidated. Should their portfolio selection be in‡uenced by the uncertainty of exit time? In order to answer that question, we consider a suitable extension of the familiar optimal investment problem of Merton (1971), where we allow the conditional distribution function of an agent’s time-horizon to be stochastic and correl...