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PROC SURVEYMEANS Statement

PROC SURVEYMEANS < options > < statistic-keywords > ;

statistic-keywords

specifies the statistics for the procedure to compute. If you do not specify any statistic-keywords, PROC SURVEYMEANS computes the NOBS, MEAN, STDERR, and CLM statistics by default.

The statistics produced depend on the type of the analysis variable. If you name a numeric variable in the CLASS statement, then the procedure analyzes that variable as a categorical variable. The procedure always analyzes character variables as categorical.

PROC SURVEYMEANS computes MIN, MAX, and RANGE for numeric variables but not for categorical variables. For numeric variables, the keyword MEAN produces the mean, but for categorical variables it produces the proportion in each category or level. Also for categorical variables, the keyword NOBS produces the number of observations for each variable level, and the keyword NMISS produces the number of missing observations for each level. If you request the keyword NCLUSTER for a categorical variable, PROC SURVEYMEANS displays for each level the number of clusters with observations in that level. PROC SURVEYMEANS computes SUMWGT in the same way for both categorical and numeric variables, as the sum of the weights over all nonmissing observations.

PROC SURVEYMEANS performs univariate analysis, analyzing each variable separately. Thus, the number of nonmissing and missing observations may not be the same for all analysis variables.

If you use the keyword RATIO without the keyword MEAN, the keyword MEAN is implied.

Other available statistics computed for a ratio are N, NCLU, SUMWGT, RATIO, STDERR, DF, T, PROBT, and CLM, as listed below. If no statistics are requested, the procedure will compute the ratio and its standard error by default for a RATIO statement.

The valid statistic-keywords are as follows:

ALL

all statistics listed

CLM

% confidence limits for the MEAN, where is determined by the ALPHA= option, and the default is

CLSUM

% confidence limits for the SUM, where is determined by the ALPHA= option, and the default is

CV

coefficient of variation for MEAN

CVSUM

coefficient of variation for SUM

DF

degrees of freedom for the t test

MAX

maximum value

MEAN

mean for a numeric variable, or the proportion in each category for a categorical variable

MIN

minimum value

NCLUSTER

number of clusters

NMISS

number of missing observations

NOBS

number of nonmissing observations

RANGE

range, MAX-MIN

RATIO

ratio of means or proportions

STD

standard deviation of the SUM. When you request SUM, the procedure computes STD by default.

STDERR

standard error of the MEAN or RATIO. When you request MEAN or RATIO, the procedure computes STDERR by default.

SUM

weighted sum, , or estimated population total when the appropriate sampling weights are used

SUMWGT

sum of the weights,

T

t-value and its corresponding p-value with DF degrees of freedom for

where is the population mean or the population ratio

VAR

variance of the MEAN or RATIO

VARSUM

variance of the SUM

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