Marilyn K. Hart

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  www.statit.com/docs/welcome_to_statitsoftware.htm - [Cached Version]
  Published on: 3/7/2007    Last Visited: 3/7/2007  

  Drs. Robert & Marilyn Hart

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  www.statit.com/support/quality_practice_tips/dont_overc - [Cached Version]
  Published on: 3/20/2006    Last Visited: 8/24/2008  

  Marilyn K. Hart, Ph.D.
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  Hart, Marilyn K. and Robert F. Hart.
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  Robert and Marilyn Hart at robthart@aol.com or (541)412-0425.

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  www.statit.com/support/quality_practice_tips/shewhartpc - [Cached Version]
  Published on: 3/20/2006    Last Visited: 8/24/2008  

  Marilyn K. Hart, Ph.D.
  
  An important question regarding test result validity is: "Given a positive test result, what is the probability that this test result is wrong?"This question is answered by the positive predictive error rate, the number of false positive test results divided by the total number of positive test results.The case study here comes from Statistical Process Control for Health Care by Marilyn and Robert Hart, Duxbury, 2002.
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  Robert and Marilyn Hart at robthart@aol.com or (541)412-0425.

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  www.statit.com/support/quality_practice_tips/control_ch - [Cached Version]
  Published on: 3/20/2006    Last Visited: 8/24/2008  

  Marilyn K. Hart, Ph.D.
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  Robert and Marilyn Hart at robthart@aol.com or (541)412-0425.

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  www.statit.com/support/quality_practice_tips/graphsvsco - [Cached Version]
  Published on: 3/20/2006    Last Visited: 8/24/2008  

  Marilyn K. Hart, Ph.D.
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  Robert and Marilyn Hart at hart@uwosh.edu or (541) 412-0425.

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  www.statit.com/support/quality_practice_tips/xbarschart - [Cached Version]
  Published on: 3/20/2006    Last Visited: 8/24/2008  

  Marilyn K. Hart, Ph.D.
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  Recommended values of "T" for "T-sigma" limits for an arbitrary number of subgroups are shown in Table 1 [Hart and Hart, 2002].
  
  Table 1.T-Sigma Limits
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  When making an and s chart with varying subgroup sizes, there are three accepted ways of estimating ,, the population standard deviation [SAS, 1995, pp.1214 - 1215, Hart and Hart, 2002].
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  Hart, Marilyn, and Robert Hart.
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  Robert and Marilyn Hart at robthart@aol.com or (541)412-0425.

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  www.statit.com/support/quality_practice_tips/transforma - [Cached Version]
  Published on: 3/20/2006    Last Visited: 8/24/2008  

  Marilyn K. Hart, Ph.D.
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  A convenient way to handle this problem of data skewed to the right is to "transform" the data into a data set which has a near-normal distribution [Hart and Hart, 2002].
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  Robert and Marilyn Hart at robthart@aol.com or (541)412-0425.

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  www.statit.com/support/quality_practice_tips/interrupte - [Cached Version]
  Published on: 3/20/2006    Last Visited: 8/24/2008  

  Marilyn K. Hart, Ph.D.
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  Reference: Excerpted from Statistical Process Control for Health Care, by Marilyn K. Hart, Ph.D. and Robert F. Hart, Ph.D., Duxbury Press, 2002.
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  Robert and Marilyn Hart at robthart@aol.com.

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  www.statit.com/support/quality_practice_tips/interrupte - [Cached Version]
  Published on: 3/20/2006    Last Visited: 8/24/2008  

  Marilyn K. Hart, Ph.D.
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  Hart, Marilyn, and Robert Hart.
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  Robert and Marilyn Hart at robthart@aol.com.

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  www.statit.com/support/quality_practice_tips/subgroupsi - [Cached Version]
  Published on: 3/20/2006    Last Visited: 8/24/2008  

  Marilyn K. Hart, Ph.D.
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  If pBar is less than or equal to 0.5, use the following. [Hart and Hart, 2002, p. 190]
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  The following example, taken from Hart and Hart [2002] illustrates the concept of combining subgroups when needed.
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  This chart (Figure 2) requires 2-sigma limits since there are only four subgroups [Hart and Hart, 2002; Statit Tips, December 2000].
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  Hart, Marilyn and R. Hart.Statistical Process Control in Health Care.Duxbury, Pacific Grove, California, 2002. Hart, Marilyn and R. Hart."Using Other Than Three Sigma Limits on a Control Chart," Statit Bulletin, December 2000.ASTM (American Society for Testing and Materials).ASTM Manual on Presentation of Data and Control Chart Analysis, MNL7, 6th ed.Philadelphia: American Society for Testing and Materials, 1990.Analysis and output created with Statit Express QC, Statit Software, Inc..
  
  For more information, contact Drs.Robert and Marilyn Hart at robthart@aol.com.

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