Statistics for Maintenance Modelling: Continuous Lifetime Distributions 2

# Question 1¤

The following distributions have similar hazard functions with the parameters:

- Loglogistic with = 0.1206, = 5.878
- Pareto with = 0.1, = 0.05
- Lognormal with = 0.0001, = 6.569.

What is R(3) - R(2) for the lognormal? Click on one of the options below, then click on "Check Answer".

-0.012
-0.018
-0.024
-0.031
None of these
Yes, that's right. R(t) = 1 - F(t) so in Excel you can calculate it with:
=(1-LOGNORMDIST(3,0.0001,6.569))-(1-LOGNORMDIST(2,0.0001,6.569)) which gives the answer -0.0244.
No, the answer is -0.024. This is because R(t) = 1 - F(t) so in Excel you can calculate it with:
=(1-LOGNORMDIST(3,0.0001,6.569))-(1-LOGNORMDIST(2,0.0001,6.569)) which gives the answer -0.0244.