From e-books to streaming music, people are moving to digital formats for their entertainment. But not all are moving at the same pace. The way we buy may be as much a factor of gender and ethnic group as spending power, according to this recent Nielsen U.S. Consumer Entertainment Report. Digital music buyers, for example, are 5 percent more likely than the average U.S. adult to be Hispanic. E-book buyers are 21 percent more likely to be female. And buyers of streaming services are 73 percent more likely to be Asian.