Transcript Analisis Statistik untuk Kapabilitas Proses (pert 17)

Analisis Statistik untuk Kapabilitas
Proses (pert 17)
Analisis Statistik untuk Kapabilitas
Proses (pert 17)
Kapabilitas Proses
• Model konvesional untuk probabilitas kegagalan
perlengkapan
• Definisi keterandalan
• Menghitung kurva OC untuk rencana penarikan sampel
• Pendugaan nilai tengah masa hidup
Kapabilitas Proses
• Beberapa pertimbangan ekonomis dalam merancang
prosedur penarikan
• Penggunaan kriteria penerimaan
• Aneka ragam kurva bertahan
• Distribusi Weibull
Steps in Determining Process Capability
• Determine if Specifications are Currently Being Met
• Collect at least 100 random samples from the process
• Calculate the sample mean and standard deviation to estimate the
true mean and standard deviation of the process.
• Create a frequency distribution for the data and determine if it is
close to being normally distributed. If it is continue; if not, get the
help of a statistician to transform the data or to find an alternative
model.
• Plot the USL and LSL on the frequency distribution.
• If part of the histogram is outside the specification limits, consider
adjusting the mean to center the process.
• If the histogram indicates that the process spread is greater than the
specification spread, the process might not be capable.
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