Estimating Traffic (TrafficEstimatorService) with and without campaign/adgroup/keyword ids

[Paul Lo]

Hello,

I've started to try TrafficEstimatorService recently, and I found that if I 
submit the request without providing adGroupId, campaignId, criterionId 
(keyword id), the estimated CPC for each keyword are around 30% lower than 
my historical CPCs . 

I can read from KeywordEstimateRequest doc 
<https://developers.google.com/adwords/api/docs/reference/v201509/TrafficEstimatorService.KeywordEstimateRequest>
 
that:

   - When present with a campaign and ad group also specified, the ID 
   should be for an existing keyword in the ad group. *This can improve the 
   estimates since historical performance is known*.

However, I don't really understand the concept. *All other conditions 
(budget, target audience) remain the same in my query*, how can those IDs 
affect the result? Does that mean for some reason my account is paying 
higher CPC in comparison with market price? I think IDs should be 
independent of the estimation.

    selector = {
          'campaignEstimateRequests': [{
              'dailyBudget': {
                  'xsi_type': 'Money',
                  'microAmount': ....
              },
              'adGroupEstimateRequests': [{
                  '*adGroupId*': adgroup_id,
                  'keywordEstimateRequests': [ ..... ]
              }],
              '*campaignId*': campaign_id,
              'networkSetting': {
                  'targetGoogleSearch': 'true',
                  'targetSearchNetwork': 'true',
                  'targetContentNetwork': 'false',
                  'targetPartnerSearchNetwork': 'false'
              },
              'criteria': [
                  {
                      'xsi_type': 'Location',
                      'id': '2840'  # United States.
                  },
                  {
                      'xsi_type': 'Location',
                      'id': '2124'  # Canada
                  },
                  {
                      'xsi_type': 'Language',
                      'id': '1000'  # English.
                  }
              ]
          }]
    }
    traffic_estimator_service.get(selector)

Thanks

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