As you read down through this Report....one must keep in mind the various Threat Envelopes encountered during the span of the Vietnam War and also bear in mind that the AA Threat in South Vietnam other than Border Regions with Cambodia, Laos, and North Vietnam was quite different than in the North and Border Regions and the Ho Chi Minh Trail areas of neighboring countries.
An example of some Stats for the A-1 Sky Raider during the War:
266 Lost to all Causes
3 Lost due to Air to Air Combat (two lost to MIG 17's)
5 Lost to SAM's
But....two MIG 17's were bagged by A-1's.....for an equal trade off.
http://www.dtic.mil/dtic/tr/fulltext/u2/c016682.pdf