Applying Shewhart quality control principles for time series data. The package performers following tasks including: subgrouping for various time intervals; obtaining subgroup summaries (e.g. mean, standard deviation, skewness, kurtosis ); partitioning data into common and special cause using Shewhat S chart; estimate mean and standard deviation using stepwise Shewhart robust chart procedures; other robust estimators for standard deviation}; calculating the first four moments in total, common and special cause partitions; Difference charts (mean and standard deviation) and plotting charts.
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