Am I correct in thinking that all things being equal, when a quarter is shortened by a week, we'd be accounting for an automatic 8% less. 12 weeks in a quarter,

Am I correct in thinking that all things being equal, when a quarter is shortened by a week, we'd be accounting for an automatic 8% less. 12 weeks in a quarter, only accounting for 11 this time around. With the other factors mentioned in the article, is it safe to say Apple is about even with 2012?