The weighting describes the proportion of an advertisement in the campaign compared to other advertising media with the same format. This is interesting only in the event that two advertising media are available in a campaign that have the same format (dimensions in banners and HTML or script / pop) and would thus compete in the campaign to screen displays.
A value of 0 means here that the two competing advertising media by eCPM should be weighted, whereby the ad with the higher income comes primarily. An unequal value of 0 indicates that this value should be used as a share of the advertising medium on the total pressure.
Example: There are two ads in the format 468x60 in a campaign that thus compete for screen displays. Now Banner A is to receive 30% of impressions and banner B 70%. The weighting in this case is then 3: 7 or 30:70 or 9:21, etc.