CUMULATIVE MAXIMUM

CUMULATIVE MAXIMUM (LET)

Let Subcommand

Compute the cumulative maximum for a variable.

For element I of the given variable, the cumulative maximum is the maximum of elements 1 through I.

LET <y> = CUMULATIVE MAXIMUM <x>       <SUBSET/EXCEPT/FOR qualification>
where <x> is a response variable;
            <y> is a variable where the computed cumulative maximums are stored;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.

LET Y2 = CUMULATIVE MAXIMUM Y1
LET Y2 = CUMULATIVE MAXIMUM Y1 SUBSET Y1 > 0

None

None

MAXIMUM	= Compute the maximum of a variable.
CUMULATIVE STATISTIC	= Compute the cumulative value of a specified statistic for a variable.
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 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

2012/12

 
let y = norm rand numb for i = 1 1 10
.
let y1 = cumulative sum  y
let y2 = cumulative mean y
let y3 = cumulative mini y
let y4 = cumulative maxi y
.
set write decimals 3
print y y1 y2 y3 y4
    

The following output is generated

---------------------------------------------------------------------------
              Y             Y1             Y2             Y3             Y4
---------------------------------------------------------------------------
         -1.073         -1.073         -1.073         -1.073         -1.073
          0.573         -0.499         -0.249         -1.073          0.573
         -0.873         -1.373         -0.457         -1.073          0.573
          0.233         -1.139         -0.284         -1.073          0.573
         -0.455         -1.594         -0.318         -1.073          0.573
         -0.525         -2.120         -0.353         -1.073          0.573
         -0.705         -2.825         -0.403         -1.073          0.573
          0.032         -2.793         -0.349         -1.073          0.573
          1.190         -1.602         -0.178         -1.073          1.190
          0.269         -1.332         -0.133         -1.073          1.190