James Barrett


  • Spectacular, thanks very much Robert. 2 years, 8 months ago

  • I am trying to analyse our suppliers’ OTD, by no. days late. However of the 500-odd lines, the spread is 75% 0-6 days and the remainder a tail out to 500 days.

    This makes for a crap histogram, control chart, time series plot, etc.

    I’m looking for advice on a good way to analyse this, given every part that arrives late, by any amount, is…[Read more]

  • Thanks both, really helpful.
    I’m not completely married to using Control Charts, it was just an example of where the maths gives above 100%.

    I’m just looking for good methods of analysing on time delivery, to be honest. 3 years, 7 months ago

  • I’m looking to analyse on time delivery data. It’s continuous and Normal, but obviously it has a maximum of 100% – does this affect how to analyse? For instance, the bell curve goes beyond 100%, and I-MR charts have an UCL of 117%. 3 years, 7 months ago

  • James Barrett became a registered member 4 years, 3 months ago