The Interesting Puzzle of Barker -- Does it Exist and in How Many Jobs

I received a challenge to disassemble the occupation of barker.  The DOT describes it:

342.657-010 BARKER (amuse. & rec.) alternate titles: carney; spieler
Attempts to attract patrons to entertainment by exhorting passing public, describing attractions of show and emphasizing variety, novelty, beauty, or some other feature believed to incite listeners to attend entertainment. May conduct brief free show, introducing performers and describing acts to be given at feature performance.
GOE: 01.07.02 STRENGTH: L GED: R3 M2 L3 SVP: 2 DLU: 77

The O*NET says that barker belongs to amusement and recreation attendants.  The O*NET reports an occupational base of 300,000 jobs.  The OOH uses the same data set and reports the same number of jobs, 300,000.  The 2017 release of the OOH (2016-18) links to the BLS reports in the Occupational Employment Statistics (OES).  The OES reports 310,970 jobs as amusement and recreation attendants as of May 2017.

The OES gives industry profile data.  About half the jobs exist in the Other Amusement and Recreation Industries (NAICS 713900) and another large chunk in Amusement Parts and Arcades (NAICS 713100).  Those two industries employ 204,490 amusement and recreation attendants.

To figure out how many barkers exist, we need to know how many occupations exist in that group of amusement and recreation attendants.  The answer is 25 per the DOT crosswalk in the O*NET.

195.367-030 Recreation Aide
340.367-010 Desk Clerk, Bowling Floor
340.477-010 Racker
341.367-010 Recreation-Facility Attendant
341.464-010 Skate-Shop Attendant
341.665-010 Ski-Tow Operator
341.677-010 Caddie
341.683-010 Golf-Range Attendant
342.357-010 Weight Guesser
342.657-010 Barker
342.657-014 Game Attendant
342.663-010 Ride Operator
342.665-010 Fun-House Operator
342.667-010 Wharf Attendant
342.667-014 Attendant, Arcade
342.677-010 Ride Attendant
343.467-014 Floor Attendant
343.577-010 Cardroom Attendant II
349.477-010 Jinrikisha Driver
349.664-010 Amusement Park Worker
349.674-010 Animal-Ride Attendant
349.677-010 Cabana Attendant
349.677-014 Coach Driver
352.667-010 Host/Hostess
372.667-026 Flagger

Those occupations work in 14 different sectors according to the employment projections (a two digit NAICS code). Job Browser Pro lists 13 of these as occurring in the amusement and recreation industries. Those are the foundations for cross-examination.The DOT lists 217 codes that work in the amusement and recreation industries, not including those common to several industries.

Q: What is the SOC code for the barker occupation? 

Q: In what industry -- by NAICS code -- does the occupation of barker occur?

Q: How many DOT codes in "Amusement and Recreation Attendants, SOC 39-3091" exist? 

Q: How many other DOT codes in "Amusement and Recreation Attendants, SOC 39-3091" work in Amusement, gambling, and recreation industries?

Q: How many of the DOT codes in that intersection of occupation and industry require light exertion and can be learned in 30 days or less?

 To play the numbers game, we have to use Job Browser Pro. When we develop an ability to use JBP seamlessly, then we can jump into the employment projections and County Business Patterns. It all starts with affirming the DOT, SOC, and NAICS codes. Without those three pieces of data -- and how many other DOT codes exist in that intersection -- we cannot defeat the Bayliss/Purdy assumption of expertise and capacity of the vocational expert.