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Help With Cycle Time Problem

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  • #54141

    Roger
    Guest

    10 ct, 8 ct, 0 ct,7 ct,11 ct,3 ct,3 ct,3 ct,5 ct,10 ct…..what is the cycle time (ct) 80% of time? how did u get it? I used this equation below and i was told it was wrong….. do i need to sort the days?

    days ppl percent
    10 1 10
    8 2 20
    0 3 30
    7 4 40
    11 5 50
    3 6 60
    3 7 70
    3 8 80
    5 9 90
    10 10 100

    0
    #193888

    Prabhu V
    Participant

    Hi,

    Can you pls elaborate your query with what is the main objective and others…..

    0
    #193901

    Eric Maass
    Participant

    Hi Roger,

    It sounds like you were given a set of individual cycle time measurements…and they want you to estimate the cycle time 80% of the time…Which is a rather vague request.
    If they wanted you to tell them a value that 80% of the cycle time values are less than, then you would want to sort the data, and find the value that 80% are less than.
    If they wanted you to assume that cycle times follow a normal distribution, you would use this sample of cycle times to come up with a sample mean and sample standard deviation, and use the normal distribution to estimate the value that 80% of the cycle times are less than.

    0
    #193908

    manipage
    Guest

    Hi Roger, I think the 80% of the time the cycle time will be 3, If it is correct, then you can find this applying simple pareto.

    0
    #193910

    Chris Seider
    Participant

    If you want the maximum cycle time you’d expect 80% of the time, you can add 0.84 times the standard deviation and add to the mean cycle time–if you are comfortable with assuming a normal distribution.

    0
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