G*Power Changelog

What's new in G*Power 3.1.9.2

Mar 29, 2014
  • Fixed a bug that could occur under very specific circumstances when transferring an effect size from the effect size drawer to the main window.

New in G*Power 3.1.9 (Feb 6, 2014)

  • Fixed a bug in the sign test’s sensitivity analysis which led to an offset of -0.5 in the reported effect size.
  • Changed the behaviour of all tests based on the binomial distribution. The upper and lower limits are now always within the range [0,n] instead of [-1,n+1]. This change may lead to alpha values larger than the requested alpha values, but now we have the advantage that the upper and lower limits correspond to actual decision boundaries. For instance, in a two-sided test H0 is rejected if, for the observed number x of successes, it holds that x = upper limit. Note, however, that the change affects the results only when N is very small.

New in G*Power 3.1.8 (Feb 1, 2014)

  • Improvements in the logistic regression module: (1) improved numerical stability (in particular for lognormal distributed covariates); (2) additional validity checks for input parameters (this applies also to the poisson regression module); (3) in sensitivity analyses the handling of cases in which the power does not increase monotonically with effect size is improved: an additional Actual power output field has been added; a deviation of this actual power value from the one requested on the input side indicates such cases; it is recommended that you check how the power depends on the effect size in the plot window.

New in G*Power 3.1.7 (Apr 20, 2013)

  • Fixed a problem in the exact test "Proportions: Inequality, two independent groups (uncontional)". The problem only occurred when p1 > p2.

New in G*Power 3.1.6 (Feb 19, 2013)

  • Fixed a problem in the sensitivity analysis of the logistic regression. The problem only occurred when p2 >= p1

New in G*Power 3.1.5 (Sep 22, 2012)

  • Fixed a problem in the test of equality of two variances. The problem did not occur when both sample sizes were identical.
  • Fixed a problem in calculating the effect size from variances in the repeated measures ANOVA.

New in G*Power 3.1.4 (Sep 22, 2012)

  • Added an options dialog to the repeated-measures ANOVA which allows a more flexible specification of effect sizes.
  • Fixed a problem in calculating the sample size for Fisher's exact test. The problem did not occur with post hoc analyses.

New in G*Power 3.1.3 (Nov 15, 2011)

  • Fixed a bug in the ANCOVA module. Changing the number of covariates now correctly leads to the appropriate change in the denominator degrees of freedom.

New in G*Power 3.1.2 (Nov 15, 2011)

  • Renamed the Repetitions parameter in repeated measures procedures to Number of measurements (Repetitions was misleading because it incorrectly suggested that the first measurement would not be counted).
  • Fixed a problem in the sensitivity analysis of the logistic regression procedure: There was an error if Odds ratio was chosen as the effect size. The problem did not occur when the effect size was specified in terms of Two probabilities.
  • Mac version: The Window menu now contains the option to hide the distributions plot and the protocol section (Hide distributions & protocol menu item) so that G*Power can be accommodated to small screens. This option has been available for some time in the Windows version (see View menu).

New in G*Power 3.1.1 (Nov 15, 2011)

  • Re-enabled options dialog for Correlation: Bivariate normal model.

New in G*Power 3.1 (Nov 15, 2011)

  • Added procedures to analyze the power of tests referring to (1) single correlations based on the tetrachoric model, (2) comparisons of dependent correlations, (3) bivariate linear regression, (4) multiple linear regression based on the random predictor model, (5) logistic regression, and (6) Poisson regression.

New in G*Power 3.0.10 (Nov 6, 2008)

  • 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.

New in G*Power 3.0.5 (Jul 6, 2007)

  • 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.