Value from Previous Date

Hey guys,
I'm new to this discussion board and quite new to BI and MSSQL.
Currently I have to solve a problem for homework in university and I don't know how to do it.
I have to build reports using Excel PowerPivot with Data out of MS SQL Server 2008. The database contains Printer-Device-Data like Errors and PageCounter.
Here is an Example of the Data:
DateId
Severity
PageCount
DeviceId
ErrorId
13.04.2012 00:00:00
1
52013
163
1
10.07.2012 00:00:00
1
56062
163
1
13.11.2012 00:00:00
4
63907
163
1
28.11.2012 00:00:00
4
64492
163
1
12.09.2012 00:00:00
4
61524
163
1
29.11.2012 00:00:00
4
64573
163
1
For explanation:
DateId is the Date, when an Error was raised, Severity is the Severity of the Error in general. DeviceId is the identifying Key for the Printer-Device. ErrorId identifies the Error and PageCount is the Total Page COunter at the moment when the Error raised.
My Problem is, that this counter shows the actual value. I want to extract the amount of pages, prinded between the two dates.
Any Ideas, how I can do this?
I tried to use DAX Formula with EARLIER() and PREVIOUSDAY(), but this didn't work.
Please help me.
Thank you!

My aim is the difference between 56062 on 10.07.2012 00:00:00 and 52013 on 13.04.2012 and so on.
The final table should look like this:
DateId
Severity
PageCount
DeviceId
ErrorId DIFF
13.04.2012 00:00:00
1
52013
163
1              52013
10.07.2012 00:00:00
1
56062
163
1               4049
13.11.2012 00:00:00
4
63907
163
1                 ...
28.11.2012 00:00:00
4
64492
163
1
12.09.2012 00:00:00
4
61524
163
1
29.11.2012 00:00:00
4
64573
163
1
Why I am doing this is that I want to calculate an Printerindex. This is the Amount of Errors related to the volume of pages, printed.
The Formula in DAX is Measure:=(COUNT(FactErrors[ErrorId]))/(SUM(FactErrors[PagesCount])/10000)
So I get this PivotTable:
Zeilenbeschriftungen
CountDevices
SUM PageCount
CountErrors
PrinterIndex
MFP
523
90135296
1362
31,24906792
HP
125
30805190
241
5,529387202
Lexmark
369
53500358
856
27,39392853
Samsung
29
5829748
265
41,33069233
Samsung CLX-92x1 93x1 Series
22
5400624
246
38,36735967
Samsung SCX-8123 8128 Series
7
429124
19
4,482612183
You see, that if I can't SUM already summarized printed volume. Another way could be to aggregate the volume as MAX() but this is not working, either.
Zeilenbeschriftungen
CountDevices
MAX PageCount
CountErrors
PrinterIndex
MFP
523
435853
1362
0,151106177
HP
125
435853
241
0,07823357
Lexmark
369
312478
856
0,159998929
Samsung
29
64117
265
0,454565103
Samsung CLX-92x1 93x1 Series
22
64117
246
0,45550292
Samsung SCX-8123 8128 Series
7
42386
19
0,442762465
I hope you see my problem ...

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My aim is the difference between 56062 on 10.07.2012 00:00:00 and 52013 on 13.04.2012 and so on.
The final table should look like this:
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Why I am doing this is that I want to calculate an Printerindex. This is the Amount of Errors related to the volume of pages, printed.
The Formula in DAX is Measure:=(COUNT(FactErrors[ErrorId]))/(SUM(FactErrors[PagesCount])/10000)
So I get this PivotTable:
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CountErrors
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MFP
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HP
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30805190
241
5,529387202
Lexmark
369
53500358
856
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Samsung
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5829748
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41,33069233
Samsung CLX-92x1 93x1 Series
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246
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Samsung SCX-8123 8128 Series
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429124
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You see, that if I can't SUM already summarized printed volume. Another way could be to aggregate the volume as MAX() but this is not working, either.
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CountDevices
MAX PageCount
CountErrors
PrinterIndex
MFP
523
435853
1362
0,151106177
HP
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435853
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Lexmark
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Samsung
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Samsung CLX-92x1 93x1 Series
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246
0,45550292
Samsung SCX-8123 8128 Series
7
42386
19
0,442762465
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