[U] User's Guide

[ U ] 12.2 Numbers 119. display 2/0.. lista1. .b2. .3. .a4. 35. 6. generate x = a + 1(3 missing values generated). listax1. .b .2. . .3. .a .4. 3 45. 6 7Numeric missing values are represented by “large positive values”. The ordering isall numbers < . < .a < .b < · · · < .zThus the expressionage > 60is true if variable age is greater than 60 or is missing. Similarly,is true if gender is not zero or is missing.gender ! = 0The way to exclude missing values is to ask whether the value is less than ‘.’, and the way todetect missing values is to ask whether the value is greater than or equal to ‘.’. For instance,. list if age>60 & age