  This paper describes a simple, causally deterministic model of quantum
measurement based on an amplitude threshold detection scheme. Surprisingly, it
is found to reproduce many phenomena normally thought to be uniquely quantum in
nature. To model an $N$-dimensional pure state, the model uses $N$ complex
random variables given by a scaled version of the wave vector with additive
complex noise. Measurements are defined by threshold crossings of the
individual components, conditioned on single-component threshold crossings. The
resulting detection probabilities match or approximate those predicted by
quantum mechanics according to the Born rule. Nevertheless, quantum phenomena
such as entanglement, contextuality, and violations of Bell's inequality under
local measurements are all shown to be exhibited by the model, thereby
demonstrating that such phenomena are not without classical analogs.
