iSixSigma

DD

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  • DD replied to the topic TAKT TIME in the forum General 13 years, 1 month ago

    Completely agreeing with Sandoor… also as you mentioned 45secs is only on the assumption that all these 5 people work on a sequential process. if the process are parallel or a combination of both then individual timings will be completely different. Also one needs to include necessary wait/travel/setting/down etc. times into the…[Read more]

  • DD replied to the topic iSixSigma Speed in the forum General 13 years, 1 month ago

    i wouldnt say that…in fact some links e.g. “Find a Job” are not working at all as of now 13th Aug 10:30AM IST. Although the discussion forum link is up but its way too slow for smooth reading and posting. I am an indian but currently accessing it from Srilanka behind my office firewall.

  • Check, if cost of air travel is linked with lead time of booking the tickets. If “yes”, then frame your problem statement around it.

  • DD replied to the topic Discrete Vs. Volume in the forum General 14 years, 8 months ago

    If 1000 pepole lie instead of 100 that does not make it the truth.

  • DD replied to the topic Chi Square test in the forum General 15 years ago

    Hi Steven,
    Please do send me the tool at [email protected]
    Thanks in advance

  • DD replied to the topic asking questions in the forum General 15 years ago

    Definetely… Six Sigma if applied in letter and spirit will help everywhere and anyone….

  • DD replied to the topic Z-Test Vs T-Tests in the forum General 15 years, 2 months ago

    Hi,
    But in some situations even with samples more than 30 the data may be non-normal, in that case how can one use Z-test. I am sceptical of such thumb rules. One can not generalise all processe this way.
    If all we work with are samples(which are supposed to follow t-distributions) and never populations then wy this Z-Test at all???
    An what…[Read more]

  • DD replied to the topic Autocorrelation in the forum General 15 years, 2 months ago

    Dear Forumites
    Anyone else would like to give his thoughts on AC?

  • DD replied to the topic Autocorrelation in the forum General 15 years, 2 months ago

    Thanks for all your responses. they have really been infomative and useful.

  • DD replied to the topic Statistics example in the forum General 15 years, 4 months ago

    Hi BTDT,
    If the average price for a home is X dollars, half the houses will always fall below average and the rest above.
    Cheers DD

  • DD replied to the topic Control Chart Conundrum in the forum General 15 years, 8 months ago

    the characteristic I’m measuring is time to perform the process.
    I did think of using a histogram to summarise, but while this might be good pictorially, I also wanted some stats to add weight to the summary; what can you put with a histogram, other than min./max., mean, and comment on shape?
    regarding stratification on a single control chart,…[Read more]

  • DD replied to the topic Control Chart Conundrum in the forum General 15 years, 8 months ago

    Thanks all,
    I think I might be able to answer my own question after reading your replies and more thought – how about using boxplots to combine the data – they show things statistically without corrupting the truth?
     

  • DD replied to the topic Control Chart Conundrum in the forum General 15 years, 8 months ago

    Thanks Accrington,
    there will actually be several charts for several people at one location, several charts for several people at another. I want to summarise statistically, if possible, how the overall process is currently performing before I introduce a change, then repeat the data collection and summarise statistically the overall i…[Read more]

  • DD replied to the topic Control Chart Conundrum in the forum General 15 years, 8 months ago

    Thanks Purpose,
    the business point of view is what I’m trying to get to.I might end up with a lot of separate control charts, how do I show how bad the process is ‘overall’?
    thx

  • DD replied to the topic Control Chart Conundrum in the forum General 15 years, 8 months ago

    so if I time order the data, and then combine the 2 data sets accordingly (i.e. data points will jump from op. A to B etc. as the tests will be done roughly at the same time) to produce a control chart, it is statistically valid even though the readings weren’t taken at the same place?
    and if the answer is yes, then my control limits, standard…[Read more]

  • DD replied to the topic Sample size in the forum General 15 years, 8 months ago

    Research Design,
    thanks for your last post, it definitely helps, you have also helped in another way;
    I looked up pretest/post design and also the Hawthorne effect;
    if they are doing the process 2 / 3 times a day, and knowing that the process can be simulated in a ‘classroom’ setting, I could get their supervisor to ‘time’ them do the process 2…[Read more]

  • DD replied to the topic Sample size in the forum General 15 years, 8 months ago

    Thanks to both of you.
    The average time is 10mins., quickest 5mins., worst case 40 mins., and the new tooling should enable the proces to be done consistently in less than 1 minute.
    Please help with the estimation of standard deviation if you can.
    Regarding random sampling & quasi-experimental design, the process is done 2 / 3 times a day, so…[Read more]

  • DD replied to the topic Sample size in the forum General 15 years, 8 months ago

    Thank you Sandor,
    I think I get what you’re saying. Because I have 30 people each taking 30 data points (in this case, time to do the process), that one site should be well represented, assuming there are no special causes, like time of year, shift etc., which in this case it is safe to assume there aren’t.
    I similarly don’t see reasons why this…[Read more]

  • DD replied to the topic EWMA in the forum General 16 years, 1 month ago

    Hi Manikandan,
    Were you from Omnex Chennai earlier?
    Regards
    DD

  • Jeff
     
    As your deployment gains more traction, you will find it difficult to use spreadsheets.   At my company, we built an internal system but eventually recognized that we could not easily implement it enterprise-wide. Consequently, we used a cross-divisional team to develop the criteria for evaluating Six Sigma project tracking sy…[Read more]

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