All reports like this are only as good as the shot selection in how different statistics are selected and valued, sure--although Portland's 2014 numbers appear very low however you slice them. As to your last concern, this appears to be a bad explanation in the report. A closer look will net the following footnote:  "Because of budget cuts, the U.S. Census Bureau no longer publishes its most detailed tables of employment and income by occupation in U.S. cities. Thus, while last year’s analysis looked specifically at “computer occupations,” this year’s analysis considers the broader “computer and mathematical occupations” category. Computer occupations – tech jobs – constitute the vast majority of the category, 94% based on last year’s data. There is also greater gender equality in mathematical occupations."