unobservedly

(ˌʌnəbˈzɜːvədlɪ)

adv

without having been observed; in an unobserved manner

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

References in periodicals archive ?

Since those just above the cutoff would likely be unobservedly more motivated than those just the below the cutoff in the presence of manipulation, we expect that any GPA manipulation will bias our estimates towards finding that academic probation hurts student performance.

ACADEMIC PROBATION, STUDENT PERFORMANCE, AND STRATEGIC COURSE-TAKING

This method is preferred to a cross-sectional approach that compares communities with hospital closures to communities without hospital closures if counties experiencing a closure are unobservedly different from those counties that did not experience a closure.

The effect of rural hospital closures on community economic health

They have moved, suddenly and almost unobservedly, quite across the sky (which before was clear) from west to east.