Notes

Accuracy of OCR and overProof is measured in comparison with the human corrections. We know human corrections in this sample are incomplete, and themselves contain errors, but they are the best we could find automatically from the NLA newspapers corpus, tagged as completely corrected then further filtered to those with at least 3 corrections, at least 40% of lines corrected and lowest third percentage of non-dictionary words.
Accuracy is measured by a separate process from that used to colour words in this output: the colouring process is heuristic, and not completely accurate.
Colour legend:
Text - OCR text corrected by human and/or overProof
Text - human and/or overProof corrections
Text - discrepencies between human and/or overProof
Text - human corrections not applied by overProof
Identified overProof corrections are calculated by the statistical calculation process, and shows those words changed by overProof which ALSO match human corrections. As human corrections are often wrong and incomplete, so too is this list.
Identified overProof non-corrections are calculated by the statistical calculation process, and shows those words in the overProof output which DO NOT MATCH human corrections. As human corrections are often wrong and incomplete, so too is this list. Words marked as [**VANDALISED] are those which have been changed by overProof but not by the human correction; as before, a missed human correction will be (incorrectly) classified as vandalisation by overProof.
Searchability of unique words refers to the distinct words in an article, and how many are present before and after correction. It is measure of how many of the words within an article could be used to find the article using a search engine.
Weighted Words refers to a calculation in which common words count for little (a fraction of a word) and unusual words count for more, in proportion to the log of the inverse of their frequency in the corpus. It may be an indicator of how well distinctive words in an article can be searched before and after correction.

Article ID 103980442, Article, POSTAGE STAMP FOR GIRL GUIDE MOVEMENT, page 14 1960-06-10, Western Herald (Bourke, NSW : 1887 - 1970), 169 words, 3 corrections

Raw OCR	Human Corrected	overProof Corrected
POSTAGE STAMP FOR	POSTAGE STAMP FOR	POSTAGE STAMP FOR
GIRL GUIDE MOVEMENT	GIRL GUIDE MOVEMENT	GIRL GUIDE MOVEMENT
A 5d. postage stamp, blue m	A 5d. postage stamp, blue in	A 5d. postage stamp, blue in
colour, commemorative, of the	colour, commemorative of the	colour, commemorative, of the
Golden Jubilee of Guiding, will	Golden Jubilee of Guiding, will	Golden Jubilee of Guiding, will
be . issued at all post offices on	be issued at all post offices on	be issued at all post offices on
Thursday, 18th August, and	Thursday, 18th August, and	Thursday, 18th August, and
will- remain on sale for ap	will remain on sale for ap-	will- remain on sale for approximately
proximately one month. In	proximately one month. In	one month. In
stating this,: the Postmaster	stating this, the Postmaster-	stating this,: the Postmaster
General, Mr. Davidson, said	General, Mr. Davidson, said	General, Mr. Davidson, said
that the Girl Guide Movement	that the Girl Guide Movement	that the Girl Guide Movement
was commenced in the United	was commenced in the United	was commenced in the United
Kingdom in 1910, and it was	Kingdom in 1910, and it was	Kingdom in 1910, and it was
now strongly represented in all	now strongly represented in all	now strongly represented in all
parts of the British Common	parts of the British Common-	parts of the British Commonwealth
wealth and in many foreign	wealth and in many foreign	and in many foreign
countries. The new- stamp will	countries. The new stamp will	countries. The new- stamp will
be of the same size and for	be of the same size and for-	be of the same size and for
mat, as the 150th Anniversary	mat as the 150th Anniversary	mat, as the 150th Anniversary
of the -Post Office commemora	of the Post Office commemora-	of the Post Office commemora-
tive: stamp and would depict a	tive stamp and would depict a	tive: stamp and would depict a
typical girl guide. In the back	typical girl guide. In the back-	typical girl guide. In the back
ground is portrayed Lord Ba	ground is portrayed Lord Ba-	ground is portrayed Lord Baden
den Powell, Founder of the	den Powell, Founder of the	Powell, Founder of the
Scout and Guide Movements.	Scout and Guide Movements.	Scout and Guide Movements.
Concluding, Mr. Davidson, said	Concluding, Mr. Davidson, said	Concluding, Mr. Davidson, said
that the Girl Guide Movement	that the Girl Guide Movement	that the Girl Guide Movement
was an important youth: orga	was an important youth orga-	was an important youth: organisation,
nisation, and the stamp will	nisation, and the stamp will	and the stamp will
not. only commemorate its an	not only commemorate its an-	not only commemorate its anniversary
niversary but also honour the	niversary but also honour the	but also honour the
important ? contributions which	important contributions which	important ? contributions which
it has made to the community.	it has made to the community.	it has made to the community.

Identified overProof corrections
Identified overProof non-corrections

	Word count	OCR accuracy %	overProof accuracy %	Errors corrected %
All Words	153	99.3	100.0	100.0
Searchability of unique words	90	100.0	100.0	100.0
Weighted Words		100.0	100.0	0.0

NLA Trial Articles from 1960

Article ID 103980442, Article, POSTAGE STAMP FOR GIRL GUIDE MOVEMENT, page 14 1960-06-10, Western Herald (Bourke, NSW : 1887 - 1970), 169 words, 3 corrections

Accumulated stats for 1 articles from year 1960