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For factors GREATER than 1.0, we multiply the rate of pacing times the factor. So a factor of 3.0 on channel id 12345 would mean that we are 3x less likely to block that request due to pacing than we normally would (assuming there is still budget available).
Another way to phrase this is the rate of pacing (ie. the time the pacing system looks to complete the budget period) is effected at a rate of
1/(delivery modifier value)For example:if a delivery modifier value of 2.0 is applied the rate of pacing is
1/ (2.0)and the pacing system will attempt to complete the budget in 1/2 the period
Similarly, for factors LESS than 1.0, we also multiply the rate of pacing times the factor. For example, a factor of 0.5 on channel id 56789 would mean that we are half as likely to return an ad on that request than we normally would.
if a delivery modifier value of 0.5 is applied the rate of pacing is
1/ (0.5)and the system will pace towards supply that matches the delivery modifier at 2x the period (ie. the budget won’t complete on this rule alone)
The MAX value for a Delivery Modifier is 5.0. Any value above 5.0 will be ignored (treated as a 1.0)
Best practices for delivery modifiers include:
The impact of a given delivery modifier rule is dependent on (a) the amount of supply the rule applies to (b) the magnitude of the rule. For this reason, we suggest adjusting delivery modifiers in an iterative fashion so that the supply makeup is indexing as desired, but that pacing isn’t impacted too dramatically.
Bid Shading
Bid shading allows a user to incrementally decrease the bid price to lower the cost of a demand tag if a budget is already on pace (where “on pace” is defined as >= 90% of goal). It essentially works like another bid modifier that is stacked with any other applicable modifiers when calculating bid price.
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