SPSS® 12.0 Command Syntax Reference

250 COMPUTE
Random variable functions (discrete distributions):
RV.BERNOULLI(a) Generate a random variable from the Bernoulli distribution (0≤a≤1).
RV.BINOM(a,b) Generate a random variable from the binomial distribution (a positive
integer, 0≤b≤1).
RV.GEOM(a) Generate a random variable from the geometric distribution (00
integer, 0≤c≤a, 0≤b≤a).
RV.NEGBIN(a,b) Generate a random variable from the negative binomial distribution (a>0
integer, 00).
Noncentral distribution functions:
NCDF.BETA(q,a,b,c) Return probability that the noncentral beta distributed variate falls below q
(0≤q≤1; a>0; b>0; c≥0).
NCDF.CHISQ(q,a,c) Return probability that the noncentral chi-square distributed variate falls
below q (q≥0; a>0; c≥0).
NCDF.F(q,a,b,c) Return probability that the noncentral F distributed variate falls below q
(q≥0; a>0; b>0; c≥0).
NCDF.T(q,a,c) Return probability that the noncentral Student t distributed variate falls
below q (a>0, c≥0).
Noncentral probability density functions:
NPDF.BETA(q,a,b,c) Return density of the noncentral beta distribution at q (0≤q≤1; a>0; b>0;
c≥0).
NPDF.CHISQ(q,a,c) Return density of the noncentral chi-square distribution at q (q≥0; a>0;
c≥0).
NPDF.F(q,a,b,c) Return density of the noncentral F distribution at q (q≥0; a>0; b>0; c≥0).
NPDF.T(q,a,c) Return density of the noncentral Student t distribution at q (a>0, c≥0).
Tail distribution functions:
SIG.CHISQ(q,a) Return probability that the chi-square distributed variate falls above q
(q≥0; a>0).
SIG.F(q,a,b) Return probability that the F distributed variate falls above q (q≥0; a>0;
b>0).
Missing-value functions:
VALUE(varname) Ignore user-missing.
MISSING(varname) True if missing.
SYSMIS(varname) True if system-missing.
NMISS(arg list) Number of missing values across list.
NVALID(arg list) Number of valid values across list.
Cross-case function:
LAG(varname,n) Value of variable n cases before.