Oystein
Penultimate Amazing
- Joined
- Dec 9, 2009
- Messages
- 18,903
I'm loving these stats!
Thanks
By the way: The total number of Professional Engineers has sometimes been stated as being in the proximity of 300,000, if I recall correctly, but my research has led me to believe it is probably closer to a million. Here's how I figured that out - and the sources of imprecision:
All States I tested so far have tools on their webpages to look up PE licenses. In some it is possible to download a full roster, or query their database such that I get all licenses returned, at least for a count. In some states, this is not possible (or I haven't been able to figure out how). Some states, such as NY, have statistics and tell you how many PEs they have. However, the full rosters are derived using different criteria from state to state: Sometimes, only active licensees are returned, sometimes they also return expired licenses, and sometimes they even return engineers who are not licensed yet, only eligible to do the required exam, and also deceased licensees. The proportion of such non-current licenses to current ones differs from state to state; in one state I found that about 2% of the full database return was deceased; in another I suspected that 30% aren't really alive and fully qualified engineers.
Generally, in most states, somewhere between perhaps 25% and 40% of the licenses I find have a non-current status. This happens for example when an engineer retires, changes career, or simply doesn't need his license any longer for whatever he does professionally. Sometimes an out-of-state engineer got a license for some project and didn't care to renew it after it expired 2 years later. So many of those non-current licenses still represent a person who is fully qualified and capable as an engineer and probably has relevant work experience. In my opinion, a status such as "expired", "inactive", "lapsed" or "retired" does not disqualify the engineer from being counted as "licensed Professional Engineer" for the purpose of counting AE911T signatures (an opinion that I have modified from an earlier, stricter stance, by the way). About 25% of Gage's 300+ PEs have such a non-current status.
Back to counting all PEs: Again, the rosters of various states are derived using different criteria to include or exclude licenses, and sometimes I don't know what these criteria are, or have difficulties assessing what differences they make. Keeping this in mind, I found that the states I looked at so far have between just over 2 and just over 4 PE licenses per 1,000 inhabitants, with a mean just over 3 per 1,000. Extrapolationg this to the USA's total population of 313 million, I estimate that there must be about 1 million PE licenses registered in the 50 states, of which perhaps 700,000 have a status of current/active/clear. Some engineers have licenses from more than one state, or more than one license within a state. This seems true for about 15% of the AE911T signatories, and so I estimate that a discount of 20% is in order to derive the number of engineers (individual persons) from the number of licenses:
I estimate that there are about 800,000 licensed Professional Engineers in the USA, of which roughly 550,000 have a current, active status.
With AE911T listing about 300 licensed PEs, they have so far managed to convince slightly less than 0.04% of the professional community. (This number is higher than the percentage for almost all states I have posted stats about so far because there is one big outlier: Richard Gage's home state of California has about 80 engineers with a CA - license; that's 26% of their signers, but California has only 12% of the US population. Percentage for USA without CA is about 0.026%; for CA I estimate roughly 0.06-0.07%)
I'm loving these stats!