@cindex expressions, mathematical
@cindex mathematical expressions
-Expressions share a common syntax each place they appear in PSPP
+Expressions share a common syntax each place they appear in @pspp{}
commands. Expressions are made up of @dfn{operands}, which can be
numbers, strings, or variable names, separated by @dfn{operators}.
There are five types of operators: grouping, arithmetic, logical,
@cindex Boolean
@cindex values, Boolean
-Some PSPP operators and expressions work with Boolean values, which
+Some @pspp{} operators and expressions work with Boolean values, which
represent true/false conditions. Booleans have only three possible
values: 0 (false), 1 (true), and system-missing (unknown).
System-missing is neither true nor false and indicates that the true
@cindex @code{(}
@cindex @code{)}
@cindex names, of functions
-PSPP functions provide mathematical abilities above and beyond
+@pspp{} functions provide mathematical abilities above and beyond
those possible using simple operators. Functions have a common
syntax: each is composed of a function name followed by a left
parenthesis, one or more arguments, and a right parenthesis.
@deftypefnx {Function} {} ACOS (@var{number})
Takes the arccosine, in radians, of @var{number}. Results in
system-missing if @var{number} is not between -1 and 1 inclusive.
-This function is a PSPP extension.
+This function is a @pspp{} extension.
@end deftypefn
@cindex arcsine
@cindex dates
@cindex dates, valid
-For compatibility, PSPP considers dates before 15 Oct 1582 invalid.
+For compatibility, @pspp{} considers dates before 15 Oct 1582 invalid.
Most time and date functions will not accept earlier dates.
@menu
@cindex time, concepts
@cindex time, intervals
-Times and dates are handled by PSPP as single numbers. A
-@dfn{time} is an interval. PSPP measures times in seconds.
+Times and dates are handled by @pspp{} as single numbers. A
+@dfn{time} is an interval. @pspp{} measures times in seconds.
Thus, the following intervals correspond with the numeric values given:
@example
@cindex dates, concepts
@cindex time, instants of
A @dfn{date}, on the other hand, is a particular instant in the past
-or the future. PSPP represents a date as a number of seconds since
+or the future. @pspp{} represents a date as a number of seconds since
midnight preceding 14 Oct 1582. Because midnight preceding the dates
-given below correspond with the numeric PSPP dates given:
+given below correspond with the numeric @pspp{} dates given:
@example
15 Oct 1582 86,400
@cindex examination, of times
@cindex time, lengths of
-These functions take numeric arguments in PSPP time format and
+These functions take numeric arguments in @pspp{} time format and
give numeric results.
@cindex days
@cindex date examination
@cindex arguments, of date extraction functions
-These functions take numeric arguments in PSPP date or time
+These functions take numeric arguments in @pspp{} date or time
format and give numeric results. These names are used for arguments:
@table @var
@item date
-A numeric value in PSPP date format.
+A numeric value in @pspp{} date format.
@item time
-A numeric value in PSPP time format.
+A numeric value in @pspp{} time format.
@item time-or-date
-A numeric value in PSPP time or date format.
+A numeric value in @pspp{} time or date format.
@end table
@cindex days
times or dates in seconds to some other unit, like days or years,
before performing analysis.
-PSPP supplies a few functions for date arithmetic:
+@pspp{} supplies a few functions for date arithmetic:
@deftypefn {Function} {} DATEDIFF (@var{date2}, @var{date1}, @var{unit})
Returns the span of time from @var{date1} to @var{date2} in terms of
@cindex Julian date
@deftypefn {Function} {} YRMODA (@var{year}, @var{month}, @var{day})
@var{year} is a year, either between 0 and 99 or at least 1582.
-Unlike other PSPP date functions, years between 0 and 99 always
+Unlike other @pspp{} date functions, years between 0 and 99 always
correspond to 1900 through 1999. @var{month} is a month between 1 and
13. @var{day} is a day between 0 and 31. A @var{day} of 0 refers to
the last day of the previous month, and a @var{month} of 13 refers to
@node Statistical Distribution Functions
@subsection Statistical Distribution Functions
-PSPP can calculate several functions of standard statistical
+@pspp{} can calculate several functions of standard statistical
distributions. These functions are named systematically based on the
function and the distribution. The table below describes the
statistical distribution functions in general:
Exponential power distribution with positive scale parameter @var{a}
and nonnegative power parameter @var{b}. Constraints: @var{a} > 0,
@var{b} >= 0, @var{x} >= 0, 0 <= @var{p} <= 1. This distribution is a
-PSPP extension.
+@pspp{} extension.
@end deftypefn
@deftypefn {Function} {} PDF.F (@var{x}, @var{df1}, @var{df2})
@deftypefn {Function} {} PDF.NTAIL (@var{x}, @var{a}, @var{sigma})
@deftypefnx {Function} {} RV.NTAIL (@var{a}, @var{sigma})
Normal tail distribution with lower limit @var{a} and standard
-deviation @var{sigma}. This distribution is a PSPP extension.
+deviation @var{sigma}. This distribution is a @pspp{} extension.
Constraints: @var{a} > 0, @var{x} > @var{a}, 0 < @var{p} < 1.
@end deftypefn
@deftypefnx {Function} {} IDF.RAYLEIGH (@var{p}, @var{sigma})
@deftypefnx {Function} {} RV.RAYLEIGH (@var{sigma})
Rayleigh distribution with scale parameter @var{sigma}. This
-distribution is a PSPP extension. Constraints: @var{sigma} > 0,
+distribution is a @pspp{} extension. Constraints: @var{sigma} > 0,
@var{x} > 0.
@end deftypefn
@deftypefn {Function} {} PDF.RTAIL (@var{x}, @var{a}, @var{sigma})
@deftypefnx {Function} {} RV.RTAIL (@var{a}, @var{sigma})
Rayleigh tail distribution with lower limit @var{a} and scale
-parameter @var{sigma}. This distribution is a PSPP extension.
+parameter @var{sigma}. This distribution is a @pspp{} extension.
Constraints: @var{a} > 0, @var{sigma} > 0, @var{x} > @var{a}.
@end deftypefn
@deftypefnx {Function} {} CDF.T1G (@var{x}, @var{a}, @var{b})
@deftypefnx {Function} {} IDF.T1G (@var{p}, @var{a}, @var{b})
Type-1 Gumbel distribution with parameters @var{a} and @var{b}. This
-distribution is a PSPP extension. Constraints: 0 < @var{p} < 1.
+distribution is a @pspp{} extension. Constraints: 0 < @var{p} < 1.
@end deftypefn
@deftypefn {Function} {} PDF.T2G (@var{x}, @var{a}, @var{b})
@deftypefnx {Function} {} CDF.T2G (@var{x}, @var{a}, @var{b})
@deftypefnx {Function} {} IDF.T2G (@var{p}, @var{a}, @var{b})
Type-2 Gumbel distribution with parameters @var{a} and @var{b}. This
-distribution is a PSPP extension. Constraints: @var{x} > 0, 0 <
+distribution is a @pspp{} extension. Constraints: @var{x} > 0, 0 <
@var{p} < 1.
@end deftypefn
projects / pspp / blobdiff