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Looking for a data set for graduation work

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  • #258425

    Igor_Gavrilov
    Participant

    I am looking for a data set, for my Final work ‘Application statistics methods on the manufacturing process’ .
    The best if it will be from manufacturing and number of samples 50 or more (k>=50), sample size has to be 10 (n=10). Of course, for decision of capable of the process should be LSL and USL.

    The Final work consists of X-bar chart, S-chart and some thoughts about capable of the process)

    Of course, all calculations and diagrams will be share.

    0
    #258468

    Robert Butler
    Participant

    The attached data set was part of a discussion thread back in June 2018. The poster was asking about changes in the batching of color addition and he/she provided this production data. You could take this data and use it for your problem. There are 10 batches of material and the color count is a count of number of times a color additive was added at various stages of the production of a single batch. I wasn’t able to find the original posting but it has to be somewhere in the 2018 time frame. If you check the posts for that year you should be able to find it. I don’t remember the name of the original poster nor the title of the post but I do know I responded and provided some graphical assessment. I’ve also attached those graphs to this post.

    Attachments:
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    2. Color_Check_23May18.xlsx
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    #258480

    Igor_Gavrilov
    Participant

    Hi Robert Butler,

    It seems like good, but I want to apply Nelson’s rules and i cannt do it because i need minimum of 15 points for seeing “Fifteen points in a row are all within 1 standard deviation of the mean on either side of the mean.” And i cannt decide about capability of the process, here is missed specifications.

    PS I have tried to find a dataset last 6 moths here in the Czech Republic, but no one company doesnt want to share it. But many thanks for helping me.

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    #258481

    Igor_Gavrilov
    Participant

    PS My Graduation work consist of:

    1. Checking Normality
    Graphically
    a. by Histogram
    b. P-P plot
    c. Q-Q plot
    Hypothesis testing
    a. Kolmogorov-Smirnov test
    2. X-bar chart
    3. S bar chart (if sample so small <10 then R chart)
    4. Apply Nelson’s rules
    5. Process Capability

    So easy work but find right data(

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    #258483

    Robert Butler
    Participant

    Nelson’s rules cover a multitude of patterns in a control chart and you can use any of them with the data set I provided.
    For the 15 point rule your answer will be, “I didn’t see that pattern in the existing data.” The follow up question would be – did I see a violation of any of the other rules?

    The provided data set will allow you to run everything in your to-do list.

    1. Checking Normality Graphically
    a. by Histogram
    b. P-P plot
    c. Q-Q plot
    Hypothesis testing
    a. Kolmogorov-Smirnov test
    2. X-bar chart
    3. S bar chart (if sample so small <10 then R chart)
    4. Apply Nelson’s rules
    5. Process Capability

    As an aside – It is highly unlikely any company anywhere will offer to provide their data to you. Even if the data is coded there is still a risk from the standpoint of highlighting some aspect of process variability – not something a company would care to have out in the public domain.

    1
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