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• What robust methods are common for Process Capability Indices for Non-Nornal distributions?

  In Europe, we found it common to use Cpkn as a non-normal Cpk metric, where mean was replaced with median, and stdev was replaced with IQR/1.35.   For some "regulatory" or "customer" reports, this seems to be accepted rather than the usual "torture the data until it says its normal" approach with transformations.   Does anyone have similar experience or better ideas?   (Note:  any use of capabilit...

  mclayton200

  Discussions |

  Jun 19, 2014 2:05 PM

  5132 views | 0 replies

• Graph Builder Remove Variable

  Hello,I am trying to use jsl to remove the x-axis variable and replace it with a different one.  It looks like I should use the GraphBuilderBox <- Remove Variable() tool, but since I change the x-axis variable multiple times, I do not know its name and would like to use the Remove Variable(Role("X"), Position(1)) method, but this does not work.  Any assistance would be appreciated.Thank you,Martin

  Martin

  Discussions |

  Apr 15, 2014 6:44 AM

  2879 views | 0 replies

• How to calculate average (median) of a group of variables to get the eudlidean centre

  How would I calculate the shape of the average (using the median) of a variable from a group within a data set? I need a certain function for calculating the centre of gravity (centroid) or Euclidian centre of this group of variable.
  Many thanks!!

  alexsheehy1992

  Discussions |

  Apr 2, 2014 12:17 PM

  4320 views | 0 replies

• LD50 and LT50 calculation

  Hi everybody,I would want to calculate LD50 and LT50 from a dataset organized in 6 columns:- Name of the compound (I just got 1 compound named A)- Concentration of the compound (2 dilutions per compound)- Individual number (a fixed number of 10 individuals is used per assay)- State of the individual at the end of the experiment (1 = alive, 0 = dead)- Day death (experiment last 15 days)- Experiment...

  cecilia

  Discussions |

  Mar 5, 2014 8:13 AM

  5360 views | 0 replies

• How to add "All pair Tukey-Kramer" & mean diamond in graph builder box plots?

  We can do as above simply using "Fit Y by X" with quantiles and compare means , however I can't find the way if I compile box plots using graph builder (especially when I need to compare more complicated box plots).Can anyone show some hints please? Thank you very much.

  Anonymous

  Discussions |

  Mar 2, 2014 9:15 PM

  3609 views | 0 replies