Subindexing and Marginal Differencing

dfdsiii

New Member
Joined
Sep 10, 2019
Messages
1
I have this dataset:
UserDateTime
A9/1/20198:00 AM
A9/1/201910:00 AM
A9/1/20194:00 PM
A9/1/20195:00 PM
A9/2/20198:00 AM
A9/2/20195:00 PM
B9/1/20199:00 AM
B9/1/20193:00 PM
B9/1/20195:00 PM

<tbody>
</tbody>
The first thing I want to do is add a subindex on User and Date.
UserDateTimeUser/Date Index
A9/1/20198:00 AM1
A9/1/201910:00 AM2
A9/1/20194:00 PM3
A9/1/20195:00 PM4
A9/2/20198:00 AM1
A9/2/20195:00 PM2
B9/1/20199:00 AM1
B9/1/20193:00 PM2
B9/1/20195:00 PM3

<tbody>
</tbody>
The second thing I want is a column that takes the difference between times in its row (A) and the row after it (A+1). "n/a" means I don't really care about this value. I just want the interday marginal differences.
UserDateTimeUser/Date IndexMarginal Difference
A9/1/20198:00 AM102:00:00
A9/1/201910:00 AM206:00:00
A9/1/20194:00 PM301:00:00
A9/1/20195:00 PM4n/a
A9/2/20198:00 AM109:00:00
A9/2/20195:00 PM2n/a
B9/1/20199:00 AM106:00:00
B9/1/20193:00 PM202:00:00
B9/1/20195:00 PM3n/a

<tbody>
</tbody>
 

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Hi & welcome to MrExcel.
How about


Book1
ABCDE
1UserDateTime
2A09/01/20198:00 AM102:00:00
3A09/01/201910:00 AM206:00:00
4A09/01/20194:00 PM301:00:00
5A09/01/20195:00 PM4
6A09/02/20198:00 AM109:00:00
7A09/02/20195:00 PM2
8B09/01/20199:00 AM106:00:00
9B09/01/20193:00 PM202:00:00
10B09/01/20195:00 PM3
Data
Cell Formulas
RangeFormula
D2=COUNTIFS(A$2:A2,A2,B$2:B2,B2)
E2=IF(D3>D2,C3-C2,"")
 
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