Changes in version 2.22.12 (2022-12-22)                 

    o   The vignette for the pooledEstimator function is added.

    o   The updated acc function privides the exponential and Weibull t
	control charts.

    o   The updated racc function privides the robust exponential and
	Weibull t control charts.

    o   The updated rcc function can handle unbalanced samples with
	different pooling methods.

    o   Some references are updated.

                 Changes in version 2.22.5 (2022-05-23)                 

    o   Some references are updated.

    o   The new racc function for the robust attributes control charts
	is added.

                 Changes in version 2.22.1 (2022-01-25)                 

    o   The argument 'method' is changed to 'estimator.'

    o   The new pooledEstimator function is added.  This function
	calculates the pooled estimator based on the unbiased
	estimators such as the mean, median, Hodges-Lehmann (HL1, HL2,
	HL3), standard deviation, range, median absolute deviation
	(MAD) and Shamos estimators..

    o   The new acc function for the attributes control charts is
	added.

    o   The new sd.unbiased function is added.

    o   The updated rcc function can handle unbalanced samples.

    o   The updated evar function can handle multiple samples.

    o   The updated RE function can handle multiple samples.

    o   The factors.cc is improved for the case of 'factor="d3".'

                 Changes in version 1.20.7 (2020-07-05)                 

    o   The S and R charts are added in the rcc function.

    o   The vignettes for the factors.cc and rcc functions are added.

    o   The A3.factor function is replaced with the updated factors.cc
	function.

    o   Typos are corrected. For example, some typos in the help page
	of shamos function.

                 Changes in version 1.20.3 (2020-03-01)                 

    o   The graphics parts were added.

    o   The summary function for the output from rcc was added.

    o   The print function for the output from rcc was added.

    o   The plot function for the output from rcc was added.

                Changes in version 0.19.8.2 (2019-08-02)                

    o   The first rQCC R package was developed.

    o   Unbiased robust estimates were implemented.

    o   Incorporated into control charting applications.