A data collection strategy in which the activities of subjects are visually examined. The observer attempts to keep his/her presence from interfering in or influencing any behaviors.

A non-verbal means of obtaining primary data as an alternative or complement to questioning.

a row in a SAS data set. An observation is a collection of data values associated with a single entity, such as a customer or state. Each observation contains one data value for each variable. See also variable.

a measurement of a single variable or a single value derived logically and/or algebraically from other measured or derived values. A test result is an observation

a collection of data values that usually relate to a single object

a set of data values for each sample or case

The period of time over which GPS data is collected simultaneously by two or more receivers.

Repeated values of a data variable. The rows of a column represent the observations.

the horizontal component of a SAS data file. An observation is a collection of data values that are associated with a single entity, such as a customer or state. Each observation contains one data value for each variable in the data file. An observation is analogous to a row in a PC file.

the horizontal component of a SAS data set. Each observation contains one data value for each variable in the data set. In SAS/SPECTRAVIEW software, an observation contains the x,y,z coordinates for a data point and the response value for that location.

The acquisition of photon data from a region of the sky during a single orbital night (eclipse).