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雷达卡
想请问各位大神，有没有好的方法求累计几何平均数，我想以n为编号，编号1-5求一次几何平均值，2-6求一次几何平均值，这样依次每五个求一次几何平均，有什么好办法可以解决吗？例子如下
sanctioned_stat StateAbb Year GDP_growth n
Afghanistan AFG 1990 1
Afghanistan AFG 1991 2
Afghanistan AFG 1992 3
Afghanistan AFG 1993 4
Afghanistan AFG 1994 5
Afghanistan AFG 1995 6
Afghanistan AFG 1996 7
Afghanistan AFG 1997 8
Afghanistan AFG 1998 9
Afghanistan AFG 1999 10
Afghanistan AFG 2000 11
Afghanistan AFG 2001 12
Afghanistan AFG 2002 13
Afghanistan AFG 2003 8.8322778 14
Afghanistan AFG 2004 1.414118 15
Afghanistan AFG 2005 11.229715 16
Afghanistan AFG 2006 5.3574032 17
Afghanistan AFG 2007 13.82632 18
Afghanistan AFG 2008 3.9249838 19
Afghanistan AFG 2009 21.390528 20
Afghanistan AFG 2010 14.362441 21
Afghanistan AFG 2011 .42635479 22
Afghanistan AFG 2012 12.752287 23
Afghanistan AFG 2013 5.6007447 24
Afghanistan AFG 2014 2.7245434 25
Afghanistan AFG 2015 1.4513147 26
Afghanistan AFG 2016 2.2603142 27
Afghanistan AFG 2017 2.6470032 28
Afghanistan AFG 2018 1.1892281 29
Afghanistan AFG 2019 3.9116034 30
Afghanistan AFG 2020 31
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