# Hazard function

1. Dec 17, 2004

### izzah

Anyone know how to find the hazard function when given the survival function. I am able to calculate the cumulative hazard function, but cannot find a formula for just the hazard function. survival function is:
S(t)=e^(-at-bt2)

2. Dec 17, 2004

### NateTG

3. Dec 18, 2004

### PerennialII

Or if you don't have them available for, say, a specific distribution, go with numerical approximations.

4. Jun 24, 2010

### artbio

The hazard function is:

$$h(t)=- \frac{d Ln[S(t)]}{dt}$$

The cumulative hazard function is:

$$H(t)=-Ln[S(t)]$$

Last edited: Jun 24, 2010
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