Hi,

I am new to this, can anyone help.

I am working with matrices, with stocknames as colNames and dates as
rowNames.
The data coontains percentile ranking for the stocks.

    Date             IBM MSFT 20061122      12 4 20061115      12 4
20061108
12 4 20061101      12 4 20061025      12 4 20061018      12 4 20061011
11 3 20061004      12 3 20060927      10 3

I would like to calculate the rolling-rate-of-change of these ranking.

I tried searching for second-derivative/slope/trend/etc to no avail.

thanks in advance.

	[[alternative HTML version deleted]]

