Japan's labor minister says excluding data on daily workers from a jobs survey may explain why official statistics showed a rise in wages.
Labor Minister Takumi Nemoto was speaking at the Lower House budget committee on Thursday regarding problems with the ministry's monthly survey.
The survey came under scrutiny after it surfaced in December that the ministry had been collecting the jobs data in an improper way.
Opposition parties are now taking issue with the change the ministry made in January last year when it stopped covering daily workers in the survey.
They accuse the government of trying to make it appear that wages were higher than they actually were.
Nemoto said the ministry is examining how the change affected the survey results.
But he agreed it is possible that excluding daily workers from the survey resulted in statistics that showed an increase in wages.