How can I pull a avg for a range in a lookup statement

Question

I have 2 data sources that I am trying compare  Once has a start date and end date and the other has a constant list of values and dates.  I want to AVG the values for the time between the start and end date in the other table. See example below....
DataSet1
Group         Start                                         End
123         3/21/14 1:00:00PM        3/21/14 5:00:00 PM
124         3/21/14 6:00:00PM        3/21/14 9:00:00 PM
125         3/21/14 9:00:00PM        3/22/14 1:00:00 AM
DataSet2
Datetime                                       Value
3/21/14 1:00:00PM                         33.2
3/21/14 2:00:00PM                         34.2
3/21/14 3:00:00PM                         31.2
3/21/14 4:00:00PM                         37.2
3/21/14 5:00:00PM                         33.2
3/21/14 6:00:00PM                         34.2
3/21/14 7:00:00PM                         31.2
3/21/14 8:00:00PM                         37.2
ETC......
I want it o make a table that shows ...
Group         Start                                         End                           
AVG Value for time
123         3/21/14 1:00:00PM        3/21/14 5:00:00 PM                           
124         3/21/14 6:00:00PM        3/21/14 9:00:00 PM                           
I can get the value for the start date and end date but I need all values Averaged.  Any ideas?

Answer 1

Hi mbh23,
After testing the issue in my environment, we can refer to the steps below to achieve your requirement:
Drag a table to design surface, insert Datetime field, Datetime field and Value field.
In the Row Groups pane, right-click the Details group to add a parent group grouped by the expression below:
=iif(Fields!Datetime.Value>="3/21/14 1:00:00PM" and Fields!Datetime.Value<"3/21/14 6:00:00PM",123,iif(Fields!Datetime.Value>="3/21/14 6:00:00PM" and Fields!Datetime.Value<"3/21/14 10:00:00PM",124,125))
Right-click the Details Group to add a total row after.
Modify the expressions of new row to like below:
=First(Fields!Datetime.Value)                =Last(Fields!Datetime.Value) 
=Sum(Fields!Value.Value) / Count(Fields!Datetime.Value)
Right-click the second row to select Row Visibility with Hide option in the table.
The following screenshot is for your reference:
If there are any other questions, please feel free to ask.
Thanks,
Katherine Xiong
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