Re: [R] System Reliability Metrics

From: Jon Stearley <jrstear_at_sandia.gov>
Date: Sat 24 Dec 2005 - 06:32:28 EST

On Dec 21, 2005, at 11:02 AM, Jon Stearley wrote:

> I need to calculate some metrics such as Mean Time Between Failure
> (MTBF), etc (see http://www.cs.sandia.gov/~jrstear/ras for a more
> complete list). I have observations like
>
> start end state
> 1 2005-11-11 09:05:00 2005-11-11 12:20:00 Scheduled Downtime
> 2 2005-11-12 13:42:00 2005-11-12 14:45:00 Unscheduled Downtime
>
> where each row describes the system state between start and end
> times. Time between observations indicates a Production state.
> The metrics of interest involve simple ratios of total time spent
> in various states, number of transitions, etc. I'd like to plot
> period MTBF values (eg monthly vertical bars), as well as a
> cumulative MTBF (eg a line whose last value indicates MTBF for the
> entire time range), etc.
>
> What is the best approach in R towards these results?

I have found that the zoo package fills most of my needs. Thanks.

-jon



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