I am currently a bit stuck on the following problem. I have generated a load of csv tables looking rather like this: 
units,1,2,3,4,5,6
1,0,0,0,0,0,0
2,0,0,0,0,0,0
3,0,0,1,1,0,0
4,0,4,0,0,0,0
5,0,3,0,0,0,0
6,0,0,0,0,0,0
7,0,0,0,0,0,0
8,0,0,0,0,0,0
9,1,0,0,0,0,0
The x-axis (1-6) is "type", and the y-axis (1-9) is a count, the value in the table being the number of things of that type and length (e.g. there is one thing of length 9 and type 1). I need to obtain the mean and standard deviation for position in the table, over all the tables (e.g. what is the mean number/SD of things of type 1 and length 9 over many tables?). Something involving matrices seems like the way to go, such as described here. However, I've no idea how to perform the calculations and return a table containing the mean and and SD values once I've got the data into a matrix (and that's hard enough ;). Can anyone offer a suggestion?

In reply to Mean and standard deviation amongst multiple matrices by knirirr

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