Changes in version 1.0.1                        

Added features

  - Specifying test = "all" in item_chart or facet_chart plots the
    global level of a nested case.

                 Changes in version 1.0.0 (2022-09-30)                  

We thank an anonymous reviewer for suggesting many of the improvements
in this version!

Added features

  - Introduced class "IPV" for the output of the estimation function
    ipv_est and added first version of functions is.IPV, validate_IPV,
    and new_IPV.
  - Chart functions now all work (exclusively) on objects of class "IPV"
    with facet_chart and item_chart having the user specify which of the
    tests should be plotted via the test argument in nested cases.
  - ipv_est and input functions now (exclusively) produce output of
    class "IPV".
  - Estimation function ipv_est can now pass further arguments to the
    underlying lavaan estimation function lavaan::cfa. Among other
    things, this makes it possible to choose the estimator and treat
    missing values in various ways.
  - Changed example dataset HEXACO to also include cases with missing
    values.
  - ipv_est now also works for data in long format.
  - Example on how to add ggplot layers to an IPV chart to the vignette
    (this has been possible before, but should be emphasized)
  - Optional markers for the center distances in facet and nested charts
    emphasize that the values are read at the border of the circles
    (included by default).
  - When creating an item_overview, it is now possible to scale the font
    size (size_font =), specify the number of rows per facet to wrap
    overly wide charts (wrap =), scale the width (width =) and height
    (height =) of the file output, and select a subset of tests (tests
    =) and facets (facets =) for display.

Bugfixes

  - resolved a warning message for nested charts that include tests
    without facets (no effect on output)
  - Function rename renamed to relabel to avoid conflicts with other
    packages.
  - Resolved multiple issues with inconsistent positioning of labels in
    item_overview charts and changed the default font to 'sans', since
    the consistent width of monospaced letters is no longer needed.
  - Changed several examples to include more appropriate models at the
    expense of runtime.

                 Changes in version 0.2.0 (2021-12-14)                  

Added Features

  - Package now works based on raw data with automated model estimation
    using lavaan (function ipv_est). This is now the recommended
    workflow!
  - New raw example data (HEXACO) from the open psychometrics project
    (see ?HEXACO).
  - Create an overview over all (squared) factor loadings in all three
    models on which a nested chart is based (function item_overview).
  - Refined method available to compute center distances for groups of
    items (parameter cd_method = "aggregate"). This is now the default
    method!
  - Show only a section of a chart (parameters zoom_x and zoom_y)
  - Convenient changing of test, facet, or item labels (function
    rename).
  - Rotate the tick label in facet charts and nested charts to avoid
    overlap (parameter rotate_tick_label).
  - Set the limit of the grid in item charts (parameter grid_limit).
  - Set the order of facets for all charts types (parameter
    facet_order).
  - Set the order of tests for nested charts (parameter test_order).
  - Add an overall title for all chart types (parameter title).
  - Draw xarrows in a nested chart that end on a test circle (instead of
    a facet circle) if facet1or facet2 is specified as NA for that
    arrow.
  - Overhaul of the documentation in the vignette.

Bugfixes

  - Standardized the default order of facets across facet charts and
    item charts. It is now consistently the order of the correlation
    matrix columns in data = .
  - Negative correlations between facets or tests should now be
    displayed correctly.
  - Removed an erroneous message claiming that the axis tick was set
    automatically when it was set manually.
  - The axis tick mark (gray dotted circle) now disappears "behind"
    circles of facet charts and nested charts, instead of cutting
    through them.
  - the axis tick label (number) now more reliably appears close to the
    axis tick mark in facet charts and nested charts.
  - removed the argument show_xarrows in nested_chart, which only
    existed for technical reasons.

                 Changes in version 0.1.0 (2020-02-10)                  

Release

IPV 0.1.1.

  - Fixed issues due to changes to data.frame().