R help - Oct 2009 - Question on Bias calculations and question on read.fwf

Hi All:
Bear with me on this longer e-mail.

Questions:
1) Can you share with me on any example code that you may have that calculates
bias of a statistical forecast in a time series?

2) Supposed I have the file in the fixed width format (details below).
1-62 character key
63-76 sales data point 1
77-90 sales data 2
91-94 sales data 3
and so on (each of the data points are 14 characters in width)
What is the read.fwf command that will extract these columns?


Some more details below. If you have any thoughts, please share with me.
Basically I want to do some analysis on how we are biased on our forecasts. I
have several files as shown below. I have put one record each for the sales file
and the forecast file. The file is fixed width format. THe first 62 characters
is the key for the records. THis should be further broken down into several
column values. For
A006004004016004016011 can be broken down as follows:
Category = A006,
BU = 004
Class = 004
Size = 016
BDC = 004016011

I then want to do  cbind on both of these dataframes and compare the statistical
forecast and the actual sales for a given time window.

EXAMPLE RECORD FROM THE Sales file (columns truncated)
A005001024003000023100004231003030050303A006004004016004016011        23.200    
23.700        22.800        23.300

Example record from the Stat Forecast file (columns truncated)
A005001024003000023100004231003030050303A006004004016004016051        34.800    
35.500        34.200        34.900