CUMULATIVE (LET)

CUMULATIVE (LET)

Let Subcommand

Compute a cumulative statistic for a variable.

It is sometimes useful to a compute a cumulative value for a statistic. That is, for element i of the response variable we compute the value of the specified statistic for elements 1 to i.

Although this command is most commonly used for a location statistic, it can in fact be used for any supported statistic (enter HELP STATISTIC for a list of supported statistics).

LET <yout> = CUMULATIVE <stat> <y1> ... <yk>
                        <SUBSET/EXCEPT/FOR qualification>
where <y1> ... <yk> is a list of one to three response variables (depending on what <stat> is);
            <stat> is one of the supported statistics (HELP STATISTICS for a list);
            <yout> is a variable where the computed values are stored;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.

LET Y2 = CUMULATIVE MAD Y
LET Y2 = CUMULATIVE MEDIAN Y
LET Y2 = CUMULATIVE SD Y FOR I = 1 1 50

The commands CUMULATIVE AVERAGE, CUMULATIVE SUM, CUMULATIVE PRODUCT, CUMULATIVE INTEGRAL, CUMULATIVE MINIMUM, and CUMULATIVE MAXIMUM are implemented separately, and more efficiently, from this command.

None

None

CROSS TABULATE (LET)	= Compute a statistic, or a cumulative statistic, across groups.
MOVING	= Compute a moving statistic.
CUMULATIVE SUM	= Compute the cumulative sum of a variable.
CUMULATIVE MEAN	= Compute the cumulative mean of a variable.
CUMULATIVE MINIMUM	= Compute the cumulative minimum of a variable.
CUMULATIVE MAXIMUM	= Compute the cumulative minimum of a variable.
CUMULATIVE PRODUCT	= Compute the cumulative product of a variable.
CUMULATIVE INTEGRAL	= Compute the cumulative integral of a variable.
CUMULATIVE HAZARD	= Compute the cumulative hazard of a variable.

Data Analysis

2013/01

 
skip 25
read mavro.dat y
let n = size y
let x = sequence 1 1 n
.
let y1 = cumulative median y
let y2 = cumulative lower quartile y
let y3 = cumulative upper quartile y
.
line color red black black
.
plot y1 y2 y3 vs x