Few universities across the state have changed their operating practices as a result of an ongoing investigation of study abroad programs, according to a survey released last week by the Forum on Education Abroad, of which Yale is a member. Only 17 percent of the survey’s respondents said they made significant changes to their operating policies as part of the investigation by the New York and Connecticut attorneys general. Nearly three-quarters of respondents said they had evaluated their policies based on a code of ethics drafted by the Forum. The investigation was launched last January, nearly a year after several major institutions — including Columbia University — were exposed for taking kickbacks in exchange for using certain student loan providers.