News

    ***************************************************************
    *                                                             *
    *  Changes and Developments in the ShinyItemAnalysis Package  *
    *                                                             *
    ***************************************************************

• Changes in ShinyItemAnalysis 1.2.3 (2017-08-22) -

*** THIS IS A CRAN VERSION ***

MAJOR UPDATES

o Report's customized options were extended. Reports now include also dynamic description. o Author and dataset name can be now filled and add into reports. o Dataset 'difMedical' was renamed to 'MSAT-B' according to 'difNLR' package. Its description was mildly updated. o Purification options were added into 'Nonlinear IRT Z' and 'DDF' subsections of 'DIF/Fairness' sections. o Purification options was added 'DDF' analysis in 'Reports' section when customized setting is selected.

MINOR UPDATES

o Size of plots and font in plots was changed for reports. o Plots in HTML report are now centered. o Wording of reports' default option was updated. o References were updated in 'Reference' section and also in README file. o Wording of Spearman test in 'Validity' section was mildly updated.

• Changes in ShinyItemAnalysis 1.2.2 (2017-07-26) -

MAJOR UPDATES

o Design of reports was edited. o Several bugs were fixed: - Bug when creating report for uploaded data was fixed. - Bug when creating report for data without predictive criterion or DIF group was fixed. o ShinyItemAnalysis now uses 'plotly' package!

MINOR UPDATES

o Design and options of 'Report' page were updated. o Layout of IRT curves training page was mildly changed. There are now two curves in each plot. Also text area input was added and synchro- nized with sliders. Colour of sliders now correspond to colour of curve.

• Changes in ShinyItemAnalysis 1.2.1 (2017-07-16) -

MAJOR UPDATES

o Several bugs were fixed: - Interpretation of regression models was fixed. - Interpretation of text about correlation in Predictive validity was fixed. o ShinyItemAnalysis now used also 'data.table' package. o Data page was divided into two subpages to avoid long rendering of tables. when changing datasets. o Function 'gDiscrim' to calculate generalized discrimination was implemented. o Function 'DDplot' was edited to be able to handle generalized discrimination. Double slider was added into 'Traditional analysis page'. o Traditional analysis table was extended by adding column with generalized discrimination. This is done also in reports. o Some pages has now their own source code files: - 'Summary' - Summary.R - 'Validity'- Validity.R - 'Traditional analysis' - TraditionalAnalysis.R - 'Regression' - Regression.R - 'IRT models' - IRT.R - 'DIF/Fairness' - DIF.IRT

MINOR UPDATES

o Last three rows in regression comparison table are now bold. o Reference list was extended. o The subpage 'Distractors' of 'Item analysis' page was mildly edited. o Generalized DD plot was removed from 'Distractor' subpage. It is now available on 'Traditional item analysis' subpage. o Item patterns frequency plot is now made with 'ggplot2' package. o Names of downloaded plots were customized and their resolution was increased and size of text was descreased in some pages: - Summary - Validity - Item analysis - Regression

• Changes in ShinyItemAnalysis 1.2.0 (2017-06-15) -

*** THIS IS A CRAN VERSION ***

MAJOR UPDATES

o ShinyItemAnalysis can now handle missing values. Newly there is an option to handle NA values as zeros in scored data. o Bug in WrightMap was fixed. o We have new contributor - Lubomir Stepanek! o New online mirrors were added. o Busy indicator and tooltips were added. o Structure of application was mildy updated. o Datasets 'dataMedical()', 'dataMedicalkey()', 'dataMedicaltest()' were updated. Group variable and criterion variable were added. o The newest versions of some packages are now required ('difNLR v 1.0.2', 'difR v 4.7', 'ggplot2 v 2.2.1', 'mirt v 1.24', 'shiny 1.0.3' and 'shinyjs v 0.9').

• DIF/Fairness o Option of item purification was added into some DIF detection methods - Delta plot method, Mantel-Haneszel, Logistic regression with total score, Lord's test and Raju's test. o Default option of p-values adjustments in DIF detection methods was set to 'none'. o Bugs in DIF Logistic IRT Z and DIF Nonlinear IRT Z tables of parameters were fixed.
• IRT models o IRT models are now fitted only by mirt package. o Training plots of item characteristic and information curves were added into IRT models section. o Pearson's correlation coefficient between factor scores and standardized total score was added for Bock's nominal IRT model.
• Reports o New options for reports were added. By default no IRT models and no graphs of correlation structure are fitted. o Reports are now described in detail. o The settings of reports are now also offered in Report section. o Generation of reports is now done part by part. Once it is finished, the download button is offered. o Message boxs with warning for generation and download of reports were added.
• Validity analysis: o Validity analysis of predictive outcome is now included on Validity page in Predictive validity section. o Now it is possible to upload predictive outcome. o Dataset 'GMAT' and 'GMATtest' from 'difNLR' package include now criterion variable which can be used in Predictive validity section. o Functions 'DistractorAnalysis()' and 'plotDistractorAnalysis()' were extended by 'matching' argument.
• Item analysis o Barplot of answer selection proportion was added into Distractor subsection. o Diagram of custom discrimination - new version of DD plot - was added into Distractor subsection.

MINOR UPDATES

o CITATION file was added. o Maximum upload size was set to 30MB. o Item names were fixed and unified. o Some typos were fixed. o Readme file was updated. o Reports design was slightly updated. o Code was slightly updated to correspond to new versions of packages difNLR, mirt and ggplot2. o Selected code was updated. o Package dependencies were updated (packages 'knitr' and 'xtable' are now used in report generation). o Minor bug in DIF IRT (Lord and Raju) plots and downloads was fixed. o Designs of footer and navigation bar were updated. o The version for small media was designed. o Weblink for version 1.1.0 was created. o Reference list was expanded and links to online versions of articles were added.

• Changes in ShinyItemAnalysis 1.1.0 (2016-02-02) -

*** THIS IS A CRAN VERSION ***

MAJOR UPDATES

o New overall appearence using shinythemes package. o New datasets 'dataMedical()', 'dataMedicalkey()', 'dataMedicaltest()' were added into the package. o New dataset is offered in example datasets inside the shiny app. o Bug in Distractor plots for uploaded data was fixed. o Calculation of Success Rate in Standard Scores was fixed. o Differential Distractor Functioning detection method was added. o Syntax of difNLR functions was edited to response to new version of package. o Function plotDIFirt() was updated. o Correlation structure section was added including correlation plot and scree plot. o Pages structure was changed and updated. o IRT models are now fitted by mirt package. o Subsection IRT model selection was added into IRT models section. o Wrigh maps were added for Rasch and 1PL IRT model. o Bug in data upload was fixed. o Subsection regression model selection was added into Regression section.

MINOR UPDATES

o Typos were fixed. o Selected R code was updated. o Description of data including uploading own data set was extended. o Description of Standard scores was added. o Lower panel was updated. o Rasch model was added into IRT models section. o Pearson correlation coefficient of factor scores and Z-scores were added for IRT models o Reference list was expanded. o Bug in multinomial regression for scored data was fixed. o Bug in DDF for datasets withou DIF items was fixed. o Selected code was updated.

• Changes in ShinyItemAnalysis 1.0.0 (2016-11-25) -

*** THIS IS A CRAN VERSION ***

UPDATES

o New graphical representation via ggplot2 package o Cronbach's alpha was added o Distractor analysis was extended o More DIF detection methods were added Mantel-Haenszel test, Logistic regression, Lord's and Raju's statistic for IRT models all are now used via difR package o Delta plots were extended: fixed and normal threshold are now allowed o Multiple comparison correction methods were added into DIF detection procedures o More examples of datasets were added from difNLR package o References were added o New functions were added into the package: - 'DDplot()' function for graphical representation of difficulties and discriminations. - 'DistractorAnalysis()' function and its graphical representation 'plotDistractorAnalysis()'. - 'plotDIFirt()' and 'plotDIFLogistic()' functions for plotting characteristic curves based on IRT models and based on logistic regression.

Reference manual