Ranking Tiobe de popularidad de lenguajes de programación

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El ranking que TIOBE es un instrumento de referencia que indica la popularidad de los lenguajes de progarmación. Ya se ha publicado la versión correspondiente a abril 2007 donde se puede observar el siguiente orden:

Position Apr 2007	Position Apr 2006	Delta in Position	Programming Language	Ratings Apr 2007	Delta Apr 2006	Status
1	1		Java	18.360%	-2.92%	A
2	2		C	14.937%	-2.75%	A
3	3		C++	10.718%	-0.18%	A
4	4		PHP	8.639%	-2.24%	A
5	5		(Visual) Basic	8.280%	-1.83%	A
6	6		Perl	6.039%	+0.19%	A
7	8		Python	3.814%	+1.05%	A
8	7		C#	3.551%	-0.40%	A
9	9		JavaScript	3.137%	+1.57%	A
10	17		Ruby	2.798%	+2.31%	A
11	10		Delphi	2.334%	+0.89%	A
12	11		SAS	2.201%	+0.77%	A
13	12		PL/SQL	1.892%	+0.88%	A
14	19		D	1.515%	+1.03%	A
15	25		ABAP	1.172%	+0.84%	A
16	18		Ada	0.678%	+0.19%	B
17	14		Lisp/Scheme	0.676%	-0.05%	A--
18	16		COBOL	0.651%	+0.13%	B
19	26		Transact-SQL	0.622%	+0.30%	B
20	20		Fortran	0.613%	+0.15%	B

La metodología asociada a la lista de popularidad es la siguiente

The ratings are calculated by counting hits of the most popular search engines. The search query that is used is

+"[language] programming"

The search query is executed for the regular Google, MSN, and Yahoo! web search and the Google newsgroups and blogs for the last 12 months. The web site Alexa.com has been used to determine the most popular search engines.

By applying the search engine query as defined above, a lot of hit counts are collected. Let's define "hits(PL#i,SE)" as the number of hits of programming language PL at position i of the TIOBE index for search engine SE. The counted hits are normalized for each search engine for the first 50 languages. More formally, the rating for PL#i becomes

((hits(PL#i,SE1)/hits(PL#1) + ... + hits(PL#50)) + ... + (hits(PL#i,SEn)/hits(PL#1) + ... + hits(PL#50)))/n

where n is the number of search engines used.