Bubble charts: Developmental pathways

From the Plots menu, Bubble charts show measures and fit values graphically. They are featured in Bond & Fox. For successful operation, Excel must be available on your computer. Its maximum is 65,536 rows.

 

To produce these charts, Winsteps writes out the requisite values into a temporary file. Excel is then launched automatically. It reads in the temporary file and follows instructions to create a bubble plot. The plot is displayed, and the Excel worksheet becomes available for any alterations that are desired. The Excel worksheet may be made permanent using "Save As". The free Excel Add-in XY Chart Labeler from http://www.appspro.com/Utilities/ChartLabeler.htm is useful if your want to change the bubble labels.

 

Selecting "Bubble Chart" from the Plots menu:

 

 

1. Positioning the axes and labels: use the dialog box, or right-click on the axes and axes-titles to reposition them.

 

 

Bubble Resizing: The relative bubble sizes are set by the standard errors. of the measures. But their overall absolute size is set by Excel. To change their overall sizes,

Right click on the edge of a circle.

"Format Data Series"

"Options"

"Scale bubble size to:"

If the bubbles are roughly the same size, then their measures will be significantly different (p≤.05) if they do not overlap along the measure axis when the bubble radius is 1.96 * 1.414 * S.E. / 2 = 1.4 * S.E.

Please determine the actual bubble resizing by comparing the bubble size to the measure-axis scaling.

Bubbles showing Likert categories:

Likert data is shown in vertical bubbles -- such in Bond and Fox (2007) Fig 6.2 p.104 -- but this is not yet produced by Winsteps automatically. Please produce an item bubble-chart. Then, in its Excel worksheet, edit in extra lines for each item. Use values from ISFILE= for the item difficulties.

 

Autoshape the bubbles:

Excel 2007 and later:

Let us change the shapes of the bubbles for persons and items.

 

This may take several attempts to produce the bubbles you want.

In Excel 2007,

 

In your worksheet,

 

Click on an empty cell

 

Insert
Shapes

Rectangle

Drag your mouse to draw a square

Insert
Shapes

Rectangle (or any other shape)

 

Drag your mouse to draw a square inside the other square

 

Right-click the new square

Format Shape

Fill

Color (your choice of color)

2. Click on the outer square to select it.

“Shape fill”

“More fill colors”

 

"Colors"

Transparency”

“100%”

OK

Right-click on box

Format shape

Line color

No line

(the box disappears)

Click on one box

ctrl+click on the other box

ctrl+c to copy

On the bubble chart

Right-click a child bubble

Format data series

Format Data Series

Border Color

No line

 

Fill

Picture

Clipboard

Close

 

The bubbles should now look like your colored rectangle.

This is a little more creative, using Star shapes and gradient-color fill.


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Rasch Publications
Rasch Measurement Transactions (free, online) Rasch Measurement research papers (free, online) Probabilistic Models for Some Intelligence and Attainment Tests, Georg Rasch Applying the Rasch Model 3rd. Ed., Bond & Fox Best Test Design, Wright & Stone
Rating Scale Analysis, Wright & Masters Introduction to Rasch Measurement, E. Smith & R. Smith Introduction to Many-Facet Rasch Measurement, Thomas Eckes Invariant Measurement with Raters and Rating Scales: Rasch Models for Rater-Mediated Assessments, George Engelhard, Jr. & Stefanie Wind Statistical Analyses for Language Testers, Rita Green
Rasch Models: Foundations, Recent Developments, and Applications, Fischer & Molenaar Journal of Applied Measurement Rasch models for measurement, David Andrich Constructing Measures, Mark Wilson Rasch Analysis in the Human Sciences, Boone, Stave, Yale
in Spanish: Análisis de Rasch para todos, Agustín Tristán Mediciones, Posicionamientos y Diagnósticos Competitivos, Juan Ramón Oreja Rodríguez
Winsteps Tutorials Facets Tutorials Rasch Discussion Groups

 


 

 
Coming Rasch-related Events
Jan. 5 - Feb. 2, 2018, Fri.-Fri. On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
Jan. 10-16, 2018, Wed.-Tues. In-person workshop: Advanced Course in Rasch Measurement Theory and the application of RUMM2030, Perth, Australia (D. Andrich), Announcement
Jan. 17-19, 2018, Wed.-Fri. Rasch Conference: Seventh International Conference on Probabilistic Models for Measurement, Matilda Bay Club, Perth, Australia, Website
Jan. 22-24, 2018, Mon-Wed. In-person workshop: Rasch Measurement for Everybody en español (A. Tristan, Winsteps), San Luis Potosi, Mexico. www.ieia.com.mx
April 10-12, 2018, Tues.-Thurs. Rasch Conference: IOMW, New York, NY, www.iomw.org
April 13-17, 2018, Fri.-Tues. AERA, New York, NY, www.aera.net
May 22 - 24, 2018, Tues.-Thur. EALTA 2018 pre-conference workshop (Introduction to Rasch measurement using WINSTEPS and FACETS, Thomas Eckes & Frank Weiss-Motz), https://ealta2018.testdaf.de
May 25 - June 22, 2018, Fri.-Fri. On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
June 27 - 29, 2018, Wed.-Fri. Measurement at the Crossroads: History, philosophy and sociology of measurement, Paris, France., https://measurement2018.sciencesconf.org
June 29 - July 27, 2018, Fri.-Fri. On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com
July 25 - July 27, 2018, Wed.-Fri. Pacific-Rim Objective Measurement Symposium (PROMS), (Preconference workshops July 23-24, 2018) Fudan University, Shanghai, China "Applying Rasch Measurement in Language Assessment and across the Human Sciences" www.promsociety.org
Aug. 10 - Sept. 7, 2018, Fri.-Fri. On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com
Sept. 3 - 6, 2018, Mon.-Thurs. IMEKO World Congress, Belfast, Northern Ireland www.imeko2018.org
Oct. 12 - Nov. 9, 2018, Fri.-Fri. On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com

 

 

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