“There has been no significant change in the proportion of jobs that fit the standard-full-time employment arrangement,” reports the Employment Policy Foundation (EPF) in its latest issue of Employment Trends.

The diversity of employment arrangements in the New Economy, the report says, arises from changes in traditional self-employment, not through loss of regular full-time employee jobs.

Nearly three-quarters of all Americans are in full-time jobs, says EPF based on its analysis of Bureau of Labor Statistics data, and nearly 90 percent of those who aren’t want it that way.

The proportion of full-time jobs in the economy is about the same as it was 50 years ago. But along with rising productivity and rising participation in the job market, work patterns have changed in three major ways: schedule, arrangement and tenure.

Schedule encompasses the distinction between full and part-time work, and increases common variable schedules.

Arrangement includes the traditional employer-employee relationship, contractors, temporaries and daily oncall workers.

Expected tenure involves a distinction between indefinite and definite employment. “Project-based staffing, temporary assignments, dynamic organization and a more mobile workforce,” says the report, “have led to higher turnover, shorter tenure and altered notions of job security.