The National Center for Education Statistics in the United States surveys cohorts of first-time, beginning students at the end of their first year in post-secondary education, and then three and six years after first starting.
Per their official report, 59% of beginning bachelor's degree students in computer and information science in 2003-04 had either left post-secondary education without a degree (31%), or switched to a non-STEM field (28%) by 2009.
However, this number doesn't identify those who switch from computer science to a different STEM field as drop-outs. It also doesn't differentiate between
- students who persisted in computer science and earned a bachelor's degree by 2009,
- students who persisted in computer science but were still enrolled in 2009, or
- students who persisted in computer science but earned an associate's degree or certificate by 2009.
Fortunately, the NCES also allows you to create custom tables from this dataset using the PowerStats tool on their website. (You have to create an account to use the tool.) This is a valuable tool if you're interested in exploring these statistics further.
Using PowerStats, I found out that among those who enrolled in a bachelor's degree program with a computer/information science major in 2003-04:
- 51.3% had earned a bachelor's degree by 2009
- Of these students that earned a bachelor's degree by 2009, 67.6% said that their major when last enrolled was computer/information science.
So, 34.7% of beginning bachelor's degree students in computer and information science in 2003-04 earned a bachelor's degree in computer and information science by 2009 and 65.3% did not.
Here's part of the data table I generated for this answer: