Impressions for channels with no impressions

[KristiGourlay]

How do you handle media channels with no impressions? With other MMMs, you're supposed to input the spend. Is this the same with Meridian? Or should I just not input impressions for that channel?

For reference, my case is referring to Rakuten.

[brendalewisprice]

Yes, you can input channels that have spend but no impressions into your model.

You do that by specifying the type of channel in the CoordToColumns mapping. Just set that channel to "spend" instead of "impressions".

For example, say you have impressions and spend for Channel0 but only spend for Channel1, then the syntax would be

coord_to_columns = load.CoordToColumns(
    ...
    media=[
        'Channel0_impression',
        'Channel1_spend',

    ],
    media_spend=[
        'Channel0_spend',
        'Channel1_spend',
    ],
)