How to get accumulative mean and accumulative standard deviation?<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />does anyone know how to get accumulative mean and accumulative standard deviation? that is, I want to get accumulative mean and standard deviation from column1;
column 1 ; accumulative mean ; accumulative deviation
1 1 0
2 1.5 0.707
3 2 1.000
4 2.5 1.291
could anybody show me the script? Thank you very much for your help!
