G*Power (Intel Version)

Licence: Freeware
Version 3.0.10 | Release Date: 2008-01-24 | Download

Fixed a problem in the X-Y plot for a range of values for Generic F tests. The degrees of freedom were not properly set in the graph, leading to erroneous plot values.

Version 3.0.9 | Release Date: 2008-01-22 | Download

Eliminated the brushed metal look for better readability under Mac OS X 10.5.

Version 3.0.8 | Release Date: 2007-10-10 | Download

Fixed a serious bug in the CDF routine of the noncentral t-distribution introduced in the bugfix release 3.0.7. Please update immediately if you installed version 3.0.7.

Version 3.0.7 | Release Date: 2007-10-09 | Download

Fixed a bug in the function calculating the CDF of the noncentral t-distribution that occasionally led to (obviously) wrong values when p was very close to 1. All power routines based on the t-distribution were affected by this bug.

Version 3.0.6 | Release Date: 2007-08-14 | Download

Mac and Windows:

  • Fixed a bug in the routine that draws the central and noncentral t distributions for two-tailed tests. When alpha was very small, this bug could cause G*Power to crash.
Version 3.0.5 | Release Date: 2007-07-03 | Download

Fixed a bug in the Power Plot (opened using the X-Y-plot for a range of values button) for F-Test: MANOVA: Global effects and F-Test: MANOVA: Special effects and interactions. Sometimes some of the variables were not correctly set in the plot procedure which led to erroneous values in the graphs and the associated tables.

Version 3.0.4 | Release Date: 2007-06-28 | Download
  • Fixed a bug in the Power Plot (opened using the X-Y-plot for a range of values button) for F-Test: Multiple Regression: Special (R2 increase). The numerator df value was not always correctly determined in the plot procedure which led to erroneous values in the graphs and the associated tables.
  • Fixed some minor problems with t tests. G*Power now checks for invalid null effect sizes in a priori analyses. The t distribution PDF routine is now more robust for very large degrees of freedom by explicitly using a normal approximation in these cases.
  • When the Power Plot window was first opened by pressing the X-Y plot for a range of values button, the default was to show 4 plots simultaneously. The default has been changed to 1 plot.
  • Corrected some parsing errors in the calculator (in the Mac version, this only concerns text input in normal input fields).
  • Corrected a label in the effect size drawer for ANOVA: Fixed effects, omnibus, one-way. In the From variance input mode, the Variance within group field was erroneously labeled Error variance.
Version 3.0.3 | Release Date: 2007-03-02 | Download
No changes specified
Version 3.0 | Release Date: 2007-02-14 | Download
No changes specified