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What Chart Would Be Used?

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  • #28140

    muhannad al nabulsi
    Participant

    Acompany inspects sheets of  formica to control blemishes and  separation defects.A sample  of  100 sheets revealed a total of  72 defects.What chart  would  be used ??Why?Calculate  the limits to be  used in  controlling  this process,thanks & regards.    MN 

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    #69764

    Jaran S.
    Participant

    When a unit has 2 defects in the same piece, what do you count?
    A:  1 unit defect……then use – np chart (constant sample size)
                                                – p chart (not constant sample size)
    B:   2 defects….then use  – c chart (constant area of opportunity)   
                                          – u chart (not constant area of opportunity
     Why and How to calculate?
    You can find in many SQC or SPC books.

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    #69767

    muhannad al nabulsi
    Participant

    Thanks for the advice,but still there is  some confusion in practical application,do you recommend any special article or text book,thanks again.                                         m.nabulsi

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    #69778

    Bob Sutter
    Participant

    Before using either the c or u chart you need to ascertain whether the data conforms to a poisson distribution.  The control limits on these charts assume the data is distributed as poisson.  This is easily accomplished with most statistical packages.  Use negative binomial regression with just the dependent variable and assess whether the alpha parameter = 0. If it does then the data is distributed as poisson.  Also, for a quick check look at the mean and variance of defects per unit – in a poisson distribution they are equal.

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    #69782

    Jaran S.
    Participant

    I use ” Basic Statistics”
    by Mark J. Kiemele , Stephen R, Schmidt and Ronald J. Berdine
    You can see this book in http://www.airacad.com
    Jaran S.

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    #69810

    muhannad al nabulsi
    Participant

    Discuss the reasons why quality circles have  not been totally successful in many organisations outside Japan.Do these same factors apply in the case of  cross-functional teams? Self-managed teams?
               thanks for opinion.              MN

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    #69837

    RB from NC
    Participant

    Quality circles have not been totally successful in many organizations outside Japan. The reason is due to: we do not allow the teams to take on the responsibly and ownership. Manage does not want to let go! We want to keep responsibilities maybe we feel by letting go makes my job feel less needed and I’m out the door. Why does this happen? Lack of training for management! Again because we need to hear it LACK OF THE RIGHT TRAINING. Remember it’s okay for quality circles to make a mistake once in a while without a backlash from management. This is a learning curve that grows into success. A cross-functional team versus self managed teams is a large difference, if I were to take one or the other I would without a doubt go with self managed teams. It takes more in training but it develops a world-class environment. A cross-functional team can go from one area to another due to being crossed trained.Self managed teams takes on dept. budgets, cost avoidance, Time (sick, late, vacations, etc), quality, production and much more. When you have the team trained they too will be cross-functional.Hope this helps. RB from NC

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    #69840

    Devils Advocate
    Participant

    In my opinion, self managed teams are an idealism….at least in the organizations I’ve been in.  These days, turnover is high (both internal and external), and ultimately, someone has to be responsible.  Just my two cents
     

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    #165210

    Van Kim Ban
    Member

    One  unit  defect  is  equal  to  “defective”,just  to  calrify.
    thanks  and  regards

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    #165214

    Ward
    Participant
    #165215

    The Enablers
    Member

    MN – just what test are you taking today?

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    #165232

    muhannad al nabulsi
    Participant

    Thank You

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    #170618

    Gayathri
    Participant

    Did anyone out there give a try to Wide Circles or WideCircles. They are new word of mouth advertising platform, apparently they can push massive amount of messages through social network mediums like forums,blogs,wiki’s and so on. They say that they only bill for posts active for minimum of 5 days and price seems pretty affordable. I am going to give Wide Circles aka WideCircles a try since I am tired of PPC fraud. http://widecircles.com

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