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What qAnalist does
qAnalyst is a package that provides many function to perform statistical quality control. In particular qAnalyst does:
-control charts for variables (xbar, r-chart, s-chart)
-control charts for attributes (c, p, np, u)
-control charts for individual values (i, mr)

-capability for normal data (within and overall)
-capability for non normal data (overall)

-pareto charts

-qqplots
-distribution fitting and anderson darling statistics

-box cox trasformations
-johnson trasformations

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Since version 0.1 qAnalyst plots and calculates statistics on differenjt type of control charts
qAnalyst can estimate parameters of most important control charts and plot them by trellis graphics. Summary and print generic method on spc object provides general statistics on input data chart.


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Version 0.5.1 provided following enhancements:
it is not more compulsory to specify test code k, p, nSigma parameters. Default values will be assumed if left missing
corrected a bug on sg specification in individuals (i, mr) chart. Now it means moving range windows
changes on spc object axis labels

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Version 0.5 provided the following enhancements:

Capability function added. Capability analysis can be performed creating "capability" objects from data. Functions capabilityNormal and capabilityNotNormal create respectively capability object for normal and non normal distributions. Distributions currently supported are: normal, lognormal, weibull, gamma, exponential.
A function called invCpFun has been created to obtain specification limits, given a cp=cpk desidered index. invCpFun handles the same functions as capability.
box cox and Johnson trasformation are aivaiable via boxcoxFun.
Pareto chart are avaiable.
Functions to fit distribution and to assess goodness of fit (probability plot and Anderson Darling stats) are avaiabile.
Several bugs have been fixed in control charts section.


