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beitsgruppe forschung profil publikationen themen für abschlussarbeiten typoskriptrichtlinien art apriot g power de intranet portale ulb katalog 2026 heinrich heine universität düsseldorf allgemeine psychologie und arbeitspsychologie menü schließen zur übersichtsseite allgemeine psychologie und arbeitspsychologie arbeitsgruppe forschung profil publikationen themen für abschlussarbeiten typoskriptrichtlinien art apriot g power hhu math nat fakultät psychologie arbeitsgruppen allgemeine psychologie und arbeitspsychologie g power g power statistical power analyses for mac and windows g power is a tool to compute statistical power analyses for many different t tests f tests χ2 tests z tests and some exact tests g power can also be used to compute effect sizes and to display graphically the results of power analyses screenshots click to enlarge bild vergrößern main window bild vergrößern main window table bild vergrößern power plot bild vergrößern power plot table register whenever we find a problem with g power we provide an update as quickly as we can we will inform you about updates if you click here and add your e mail address to our mailing list we will only use your e mail address to inform you about updates we will not use your e mail address for other purposes we will not give your e mail address to anyone else you can withdraw your e mail address from the mailing list at any time help download the g power manual pdf download the short tutorial of g power pdf written for g power 2 but still useful as an introduction for more help see the papers about g power in the references section below references if you use g power for your research then we would appreciate your including one or both of the following references depending on what is appropriate to the program in the papers in which you publish your results faul f erdfelder e lang a g buchner a 2007 g power 3 a flexible statistical power analysis program for the social behavioral and biomedical sciences behavior research methods 39 175 191 download pdf faul f erdfelder e buchner a lang a g 2009 statistical power analyses using g power 3 1 tests for correlation and regression analyses behavior research methods 41 1149 1160 download pdf feedback to report possible bugs difficulties in program handling and suggestions for future versions of g power please send us an e mail download by downloading g power you agree to these terms of use g power is free for everyone this includes people working in commercial environments commercial distribution is prohibited that is no one is allowed to sell g power you may use screenshots of g power without asking for permission g power is distributed from this web page if you wish to distribute g power in some other way then you need to seek permission from the authors please send us an e mail in which you specify how and for what purpose you intend to distribute g power we do not provide licence agreements security documentations or other documents of that type this is so because we are researchers who simply do not have the time to fill out forms the windows version of g power needs runtime libraries belonging to the microsoft visual c compiler which it tries to download during installation if these libraries are not available on your windows pc other than that both the macos and the windows versions of g power run locally on your computer and do not communicate with any servers anywhere considerable effort has been put into program development and evaluation but there is no warranty whatsoever download g power 3 1 9 7 for windows xp vista 7 8 10 and 11 about 20 mb first unzip the downloaded zip file using your preferred unzip tool to extract all the files contained within the zip file next open gpowernt exe to begin working with g power if gpowernt exe fails to start run vc_redist x86 exe to download microsoft s runtime environment for c programmes if gpowernt exe runs this file may be removed you may remove the wav files if you do not want to hear certain sounds while working with g power download g power 3 1 9 6 for mac os x 10 7 to 26 about 2 mb note that g power 3 1 9 6 was compiled for intel processors according to apple applications built for intel processors will remain supported under macos until the release of macos 28 expected in the fall of 2027 we are currently developing g power 4 a native apple silicon version and anticipate making it available well before then version history 17 march 2020 release 3 1 9 7 windows changed the behavior of the x y plot for a range of values which allowed plotting graphs after changing input parameters in the main window without hitting the calculate button which however is required to update the x y plot for a range of values with the new input parameters from the main dialog 21 february 2020 release 3 1 9 6 mac and windows fixed a bug in z tests generic z test analysis criterion compute alpha the critical z was calculated incorrectly fixed a bug in t tests linear bivariate regression one group size of slope sy sx was sometimes calculated inccorrecty 14 january 2020 release 3 1 9 5 mac fixed a bug that caused the options button which is available for some tests in the main window to disappear when hide distributions control was selected 6 february 2019 release 3 1 9 4 mac and windows fixed a bug in t tests linear bivariate regression one group size of slope negative effect directions that is slope h1 slope h0 were not always handled correclty furthermore the restriction slope sy sx on the effect size which was previously ignored is now checked 7 july 2017 release 3 1 9 3 mac fixed a bug that could cause crashes 28 march 2014 release 3 1 9 2 mac fixed a bug in the χ 2 tests goodness of fit tests contingency tables module which prevented the computed effect size from appearing in the effect size drawer windows fixed a bug that could occur under very specific circumstances when transferring an effect size from the effect size drawer to the main window 10 march 2014 release 3 1 9 1 mac now includes the calculator that previously has been included only in the windows version 4 february 2014 release 3 1 9 mac and windows 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 lower limit or x upper limit note however that the change affects the results only when n is very small 31 january 2014 release 3 1 8 mac and windows 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 19 april 2013 release 3 1 7 mac and windows fixed a problem in the exact test of proportions inequality two independent groups uncontional the problem only occurred when p1 p2 18 frebruary 2013 release 3 1 6 mac and windows fixed a problem in the sensitivity analysis of the logistic regression the problem only occurred when p2 p1 mac fixed a problem in fisher s exact test 12 september 2012 release 3 1 5 1 mac fixed a problem with the effect size drawers of anova fixed effects the drawers now appear correctly after clicking on the determine button 20 august 2012 release 3 1 5 mac and windows 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 3 july 2012 release 3 1 4 mac and windows 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 22 june 2011 release 3 1 3 mac and windows 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 5 january 2010 release 3 1 2 mac and windows 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 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 16 december 2009 release 3 1 mac added procedures to analyze the power of tests for single correlations based on the tetrachoric model comparisons of dependent correlations bivariate linear regression multiple linear regression based on the random predictor model logistic regression and poisson regression 08 december 2009 release 3 1 1 windows re enabled options dialog for correlation bivariate normal model 29 june 2009 release 3 1 windows added procedures to analyze the power of tests referring to single correlations based on the tetrachoric model comparisons of dependent correlations bivariate linear regression multiple linear regression based on the random predictor model logistic regression and poisson regression 24 january 2008 release 3 0 10 mac and windows 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 22 january 2008 release 3 0 9 mac eliminated the brushed metal look for better readability under mac os x 10 5 windows fixed some minor gui problems buttons had german titles button in file dialog named open instead of save fixed problems with distribution plots plots were sometimes not appropriately clipped when copied or saved as metafile drawing glitches with some very steep curves the file dialog shown when saving graphs or protocols now uses the user s home directory mydocuments as defaults directory 10 october 2007 release 3 0 8 mac and windows 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 8 october 2007 release 3 0 7 mac and windows 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 14 august 2007 release 3 0 6 mac 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 03 july 2007 release 3 0 5 mac and windows fixed a bug in the power plot opened using the x y plot for a range of values button for f tests manova global effects and f tests 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 26 june 2007 release 3 0 4 mac and windows fixed a bug in the power plot opened using the x y plot for a range of values button for f tests 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 checkes 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 windows fixed a problem with moving the main window when the effect size drawer is open sometimes the mouse pointer appeared to be glued to the window and the movement could not be stopped properly 1 march 2007 release 3 0 3 mac and windows fixed a bug in the x y plots for a range of values for f tests anova fixed effects special main effects and interactions the df1 value was not always correctly determined in the plot procedure which led to erroneous values in the plots fixed the problem in the plot procedure that due to rounding errors the last point on the x axis was sometimes not included in the plot 28 february 2007 release 3 0 2 mac and windows fixed a probem with tooltips for effect size conventions which were not always shown windows added options mainly intended to make g power usable with low resolution displays 800 x 600 pixels the distribution protocol view and the test analysis selection view in the main window can be hidden temporarily to save space to hide show these sub views press f4 plot protocol and f5 test analysis respectively while the main window is active there are also corresponding entries in the view menu the graph window can now be made resizable to do this choose resizable window in the view menu of the graph window besides enabling restricted resizability this option initially shrinks the window to a size that fits into a 800 x 600 screen deselecting the option restores the graph window to the fixed size for which g power was optimized mac fixed a cosmetic problem when drawing extreme central and non central distributions 15 january 2007 release 3 0 1 windows effect size calculation for t tests difference between two indepent means two groups case n1 n2 the wrong means those of case n1 n2 were used to calcultate the effect size this problem has been fixed minor cosmetic changes new readme file updated installation instruction 12 01 2007 first release of version 3...