IPV 1.0.0

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.

IPV 0.2.0

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.

IPV 0.1.0

Release

IPV 0.1.1.

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