# How this Dax is working ?

#### Ombir

##### Active Member
Hi,

I don't have experience with DAX and I'm trying to understand a DAX which is used in a workbook.

This is the formula which is used to calculate earned exposure.

=SUMX (
SUMMARIZE (
Table2,
Table2[InceptionDate],
Table2[ExpiryDate],
"Earned Exposure",
COUNTA(Table2[Policy Name])
* COUNTROWS (
CALCULATETABLE ('Table1',
KEEPFILTERS(
DATESBETWEEN (
Table1[DateKey],Table2[InceptionDate], Table2[ExpiryDate]
)
)
)
)
/ COUNTROWS (
DATESBETWEEN (
Table1[DateKey],Table2[InceptionDate], Table2[ExpiryDate]

)
)
),
[Earned Exposure]
)

Please help me to understand how earned exposure is calculated in Sheet1 for each month using above formulae.

 Month Earned Exposure 1 0.855191257 2 0.765027322 3 0.846994536

<colgroup><col style="mso-width-source:userset;mso-width-alt:3364;width:69pt" width="92"> <col style="mso-width-source:userset;mso-width-alt:4059;width:83pt" width="111"> </colgroup><tbody>
</tbody>

Regards,
Ombir

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