constant
in SAS software, a number or a character string that indicates a fixed value.
constant text
the character strings that are stored as part of a macro or as a macro variable's value
in open code, from which the macro processor generates text to be used as SAS
statements, display manager commands, or other macro program statements.
controller
a computer component that manages the interaction between the computer and a
peripheral device such as a disk or a RAID. For example, a controller manages data
I/O between a CPU and a disk drive. A computer can contain many controllers. A
single CPU can command more than one controller, and a single controller can
command multiple disks.
correlation
a relationship between two variables in which there is a tendency for the values of
one variable to become larger or smaller as the values of the other variable increase
or decrease.
correlation coefficient
a statistic that measures the strength of the linear relationship between two series of
values. The values of correlation coefficients range from -1 to 1.
CPU
See central processing unit
CPU time
the amount of time it takes for the central processing unit of a computer system to
perform the calculations or other operations that you request.
Cross-Environment Data Access
a feature of SAS software that enables a SAS data file that was created in a
directory-based operating environment to be read by a SAS session in another
directory-based environment.
data control block
on IBM mainframe operating systems such as z/OS, a storage area that contains
information about the physical characteristics of an operating system data set.
data error
a type of execution error that occurs when a SAS program analyzes data that
contains invalid values. For example, a data error occurs if you specify numeric
variables in the INPUT statement for character data. SAS reports these errors in the
SAS log but continues to execute the program.
data partition
a physical file that contains data and which is part of a collection of physical files
that comprise the data component of a SAS Scalable Performance Data Engine data
set.
data representation
the form in which data is stored in a particular operating environment. Different
operating environments use different standards or conventions for storing floating-
point numbers (for example, IEEE or IBM 390); for character encoding (ASCII or
EBCDIC); for the ordering of bytes in memory (big Endian or little Endian); for
Glossary 785