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|Title: ||Carta X_barra com Amostras de Tamanho Variável: Um Novo Procedimento Dinâmico|
|Authors: ||Infante, Paulo|
Rodrigues Dias, José
|Keywords: ||Statistical quality control|
X Control chart
variable sample sizes
|Issue Date: ||2006|
|Abstract: ||In the last years a new class of control charts which parameters change during
production was developed. In this paper, we present a new procedure that
consists in a very simple and attractive method to vary the samples size. In this
procedure, which is based in the idea presented by Rodrigues Dias (1999) to
obtain different sampling intervals, the size of the following sample depends on
the information in the last instant of inspection, assuming different values, in a
distinct form that it happens when we use the technique usually known by VSS,
which considers only two values.
Some statistical properties are studied using, in particular, Markov chains.
Using a control chart for the sample mean, we present and analyse, in a critical
way, some results obtained for different changes of the quality. A comparative
study with some previously developed procedures is also presented.|
|Appears in Collections:||CIMA - Publicações - Artigos em Revistas Nacionais Com Arbitragem Científica|
MAT - Publicações - Artigos em Revistas Nacionais Com Arbitragem Científica
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