# Monthly Archives: March 2013

## Partially fixing numerical underflow for mixture models

In a mixture model the probability of an event $x$ is written $P(x=X) =\sum_{i}\pi_{i}P_{i}(x=X)$, where $\pi_{i}$ is the probability of the point belonging to mixture $i$ and $P_{i}(x=X)$ is the probability of the event $x=X$ in the $i$-th mixture. The problem is usually that the $P_i$ are small which makes underflow happen when […]