When the Supreme Court struck down race-based admissions at American colleges and universities just over a year ago, many predicted U.S. campuses would become much less diverse. But in part due to students who decide not to disclose their race or ethnicity, coupled with universities’ selective use of statistics, it is not clear how much the decision has affected diversity on campus.

As higher education institutions begin reporting the racial makeup of the class of 2028 – the first to be affected by the 2023 decision – the data is hard to interpret, confusing and inconclusive.

As a sociologist who has studied how institutions of higher education collect and report data on race and ethnicity, I have identified some factors that contribute to this lack of clarity.

Some students may not select a racial or ethnic category because they don’t believe any of the categories really fit. For example, before multiracial students could select “one or more,” an option that became widely available in 2010, they were more likely to decline to identify their race or ethnicity. Some even boycotted checkboxes entirely.

Other students don’t view their........

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