SPSS - Campus - SPSS (Uni Siegen)

What's New in SPSS Statistics 28

New Statistics

Meta-analysis

Meta-analysis constitutes a scientific process to synthesize and combine results across different research studies. It can provide systematic reviews on the magnitude of the effect sizes as well as the causes of potential variation. The methods of meta-analysis have also been expanded to the heterogeneity tests, publication bias assessment, evaluation of small study effects, and meta-regression. Various charts and plots available in meta-analysis are broadly used in data visualization, result summary, and bias illustration.

Procedure Enhancements

Power Analysis

IBM SPSS Statistics 28 includes an enhancement to the Power Analysis procedures to create a graphical representation of results. Power analysis plays a pivotal role in a study plan, design, and conduction. The calculation of power is usually before any sample data have been collected, except possibly from a small pilot study. The precise estimation of the power may tell investigators how likely it is that a statistically significant difference will be detected based on a finite sample size under a true alternative hypothesis.

All of the Power Analysis procedures now allow the user to enter a series of power values rather than a single one. These can take the form of separate (point) values, a series of values incremented by a specific amount, or a combination of both. This enhancement now results in a table of power values and, optionally, an accompanying power curve graph.

Ratio Statistics

The RATIO STATISTICS procedure in IBM SPSS Statistics has long been a convenient option for obtaining descriptive statistics on ratios of two variables, as well as the go-to procedure for property assessment professionals, whose work involves working with ratios of property assessment values to sales prices. In the time since the original procedure was implemented, changes in thinking about the use of some statistics in property valuation have occurred, and in Version 28, the RATIO STATISTICS procedure has been enhanced to make it more consistent with the current thinking, as described in the Standard on Ratio Studies document published by the International Association of Assessing Officers.

Other Procedural Enhancements

A new graphical user interface control was designed GLM and UNIANOVA. Specifically, an additional checkbox "Compare simple main effects" was added to the "EM Means..." sub-dialog to support the specification of comparisons among the main effects nested within the levels of other factors.

Data Visualizations

Relationship Maps

Relationship Maps are introduced as a new data visualization in SPSS Statistics 28. Users are now able to visually inspect the relationship across multiple variables as shown by the thickness of the connections and size of the categories indicator. This function can be found in the Graphs dropdown menu and will reference data within the active dataset.

Usability Improvements

Statistics Workbook

The Statistics Workbook combines multiple file types into one. Users will be able to write syntax, create output, and edit that output all in the Workbook for an interactive way to run data analysis.

Accessing the Workbook: After the initial installation of the product, the view will be in 'Classic (Syntax & Output)' mode. This can be seen in Edit -> Options -> Application Mode located at the top of the Options view. To switch the mode, select 'Workbook' and click 'OK'. There will be a warning dialog to remind users to close all open syntax and output documents before switching modes. To create a new Workbook, go to File -> New and select 'Workbook'.