1020 sas實習課

SAS tutorial 10/25

Overview

• PROC SUMMARY• PROC SORT

• LABEL• GOTO

SUMMARY & SORT

PROC SUMMARY

• Provides data summarization tools that compute descriptive statistics for variables across all observations or within groups of observations.

• Similar to PROC MEANS

Syntax

Differences to MEANS

• Cannot do t-test• Cannot calculate confidence limits• Cannot estimate quantiles

Example 1

DATA creativity

Result

Use “BY” option

“Not sorted in ascending sequence”

PROC SORT

• Orders SAS data set observations by the values of one or more character or numeric variables

Syntax

Example 2

Result

Example 1

Result

LABEL & GOTO

GOTO

• Directs program execution immediately to the statement label that is specified and, if followed by a RETURN statement, returns execution to the beginning of the DATA step.

(Statement) Label

• Specifies a statement label that identifies the GOTO destination. The destination must be within the same DATA step. You must specify the label argument.

Example 3

• DATA info;Input X @@;If 1<=X<=5 then go to OK;

X=3; count+1;OK:SUMX+X;Cards;

• DATA info;Input X @@;If X<1 or X>5 then do;

X=3; count+1;end;SUMX+X;Cards;

X1 X1’ SUMX

1 1 1

2 2 3

6 3 6

4 4 10

7 3 13

1 1 14

Return

• DATA info;Input X @@;If 1<=X<=5 then go to OK;

X=3; count+1;Return;OK:SUMX+X;Cards;

• DATA info;Input X Y;If X<1 or X>5 then do;

X=3; count+1;End;else SUMX+X;Cards;X1 X1’ SUMX

1 1 1

2 2 3

6 3 3

4 4 7

7 3 7

1 1 8