Changes in version 1.4.0 (2025-07-22)                  

Bug fixes:

  - In nlcpd_self_start(strategy="s1") where the base region was not set
    properly.
  - In pricelevels(settings=list(solve="matrix")) where the setting was
    not supported and is now internally set to iterative.
  - In nlcpd(settings=list(use.jac=TRUE) when there were two regions
    (R=2) leading the matrices B and C in nlcpd_jacobi() to collapse.
    Solved by adding drop=FALSE to the two matrices and added tests for
    this case.
  - In lehr(), when some quantities in the data were 0, the function
    returned NaN.
  - Fixed some links to the minpack.lm-package in the documentation for
    cpd() and nlcpd().

Improvements and other changes:

  - In pricelevels(settings=list(type=c("a","b""))), no alphabetic
    ordering by index name of the output if specific indices are
    provided; alphabetic ordering only if settings$type=NULL.
  - Added the function geoyoung() for the geometric Young index.
    Function description, tests and vignette updated.
  - For all.pairs=FALSE, the functions index.pairs() and geks() no
    longer use the price levels where the comparison and base region are
    the same (e.g., $P^{11}$) as these price levels do not provide
    valuable interregional information.
  - The attribute attr(x, "base") is always added to the function output
    of ratios() if static=FALSE and base is not NULL. The attribute
    provides the base region used to calculate the individual price
    ratios for each product. The treatment of duplicated prices by
    ratios() is now also aligned to the respective treatment by all
    index formulas in the package, that is, duplicated prices are
    averaged and ratios derived by dividing the initial prices by the
    average.
  - Added the function pairs() to compute the number of non-redundant
    index pairs available for a data set. Renamed the functions
    comparisons() and sparsity() to properties() and gaps(). Updated the
    output of properties().
  - Introduced the new (non-exported) setting settings$prods, which
    removes products with prices in only one region. This is needed
    because otherwise these products distort the estimation by cpd(),
    ikle(), gerardi(), and others if weights are used.
  - Only positive prices are supported. Before, also zero prices were
    allowed, which cannot be processed by most index formulas, however.

                 Changes in version 1.3.0 (2024-05-22)                  

  - Introduced the setting of global options options(pricelevels.[])
  - Introduced the plotting of price levels using the new non-exported
    function plot.pricelevels()
  - Adjusted the behavior of ratios()
  - Fixed a bug in the non-exported function arrange()

                 Changes in version 1.2.0 (2024-04-08)                  

  - Included the functions
    
      - mjevons() in rao()
      - mcarli() in rhajargsaht()
      - mdutot() in gkhamis()
      - mharmonic() in ikle()
    
    by setting q=NULL and/or w=NULL

  - Updated the package vignette

  - Updated tests

                 Changes in version 1.1.0 (2024-03-26)                  

  - New functions mjevons(), mcarli(), mdutot(), and mharmonic()
  - In nlcpd(), introduced matching of lower and upper bounds and
    replaced argument par.start with the default par
  - Separated the gerardi() index from the iterative ones
  - Duplicated prices are aggregated now as weighted averages instead of
    unweighted ones in the helper function arrange()
  - Updated the package vignette
  - Updated tests

                 Changes in version 1.0.2 (2024-02-08)                  

In the DESCRIPTION file:

  - Updated the package description
  - Added a reference to the World Bank's methodological manual
  - Included the Authors@R field

                        Changes in version 1.0.1                        

  - Fixed the 'no visible bindings for global variable' note caused by
    the use of the data.table-package.
  - Replaced \dontrun{} with \donttest{} in the examples.

                        Changes in version 1.0.0                        

  - Initial CRAN submission.
  - Initial release on Github.