Use Lognormal Distribution August 5, 2012MTBFlognormalFred Schenkelberg The lognormal distribution has two parameters, μ and σ. These are not the same as mean and standard deviation, which is the subject of another post, yet they do describe the distribution, including the reliability function. Where Φ is the standard normal cumulative distribution function, and t is time. Continue reading Use Lognormal Distribution → Let others know:TwitterLinkedInFacebookPrintEmailLike this:Like Loading...