PCOS 99.97 percent accurate, reports Comelec




The results generated by the Precinct Count Optical Scan (PCOS) machines during the May elections had a 99.97 percent accuracy rate, election officials said Friday.

In its report disclosed at a press briefing, the Commission on Elections’ (Comelec) and Random Manual Audit Committee (RMAC) said that in 212 of 234 clustered precincts were subjected to the required random manual audit.

The committee said it observed 237 variances in the 1,016,860 votes audited, which is equivalent to .03 percent difference.

“On the average, accuracy rate for all positions was at 99.97 percent,” the report said.

Randomly audited were votes for senators, congressmen, and mayors.

The 817,729 votes for senators had the highest accuracy rate of 99.9775 percent with only 184 variances.

For members of Congress, there were 27 variances of the 96,155 votes reviewed for an accuracy rate of 99.9719 percent. For mayors, the accuracy rate was 99.9748 percent, with 26 variance of 102,976 votes.

The auditing teams also revealed that the overall percent of the RMA managed to exceed the 99 percent accuracy rate required from the PCOS machines.

“The allowable margin of variance is set at one percent (equivalent to less than 10 votes’ difference in absolute value for every 1,000 valid votes counted),” the committee reported.

The original Terms or Reference (TOR) used by the Comelec’s Special Bids and Awards Committee in selecting the automated election system (AES) in 2009 required a 99.995 percent accuracy rate of the ballot appreciation.

But the committee said that “since most of the variance can be attributed to human errors or clerical errors, aiming for a higher accuracy rate to as high as 99.995 percent (1 vote difference in absolute value for every 20,000 valid votes counted) could be statistically improbable.”




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