History
This distribution appears to have been first derived by Schrödinger in 1915 as the time to first passage of a Brownian motion. The name inverse Gaussian was proposed by Tweedie in 1945. Wald re derived this distribution in 1947 as the limiting form of a sample in a sequential probability ratio test. Tweedie investigated this distribution in 1957 and established some of its statistical properties.
Read more about this topic: Inverse Gaussian Distribution
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