https://communities.sas.com/t5/SAS-Programming/A-in-numeric-field/m-p/41810#M8573 Hi,<BR /> I came acreoss some code lines where '.A' is placed into a numeric field to identify a missing value.<BR /> If you look into the created dataset there is an 'A' listed in a numeric field.<BR /> Is there some documentation\explanation with this feature?<BR /> <BR /> thanks<BR /> Henk<BR /> <BR /> e.g.<BR /> data test1;<BR /> length a 8 b $8;<BR /> a=1;<BR /> b='1';<BR /> output;<BR /> <BR /> a=input('.A',8.);<BR /> b='A';<BR /> output;<BR /> run;<BR /> <BR /> data test2;<BR /> set test1;<BR /> if a=input('.A',8.);<BR /> run; Tue, 29 Jun 2010 09:28:36 GMT HenkT 2010-06-29T09:28:36Z https://communities.sas.com/t5/SAS-Programming/A-in-numeric-field/m-p/41810#M8573 Hi,<BR /> I came acreoss some code lines where '.A' is placed into a numeric field to identify a missing value.<BR /> If you look into the created dataset there is an 'A' listed in a numeric field.<BR /> Is there some documentation\explanation with this feature?<BR /> <BR /> thanks<BR /> Henk<BR /> <BR /> e.g.<BR /> data test1;<BR /> length a 8 b $8;<BR /> a=1;<BR /> b='1';<BR /> output;<BR /> <BR /> a=input('.A',8.);<BR /> b='A';<BR /> output;<BR /> run;<BR /> <BR /> data test2;<BR /> set test1;<BR /> if a=input('.A',8.);<BR /> run; Tue, 29 Jun 2010 09:28:36 GMT https://communities.sas.com/t5/SAS-Programming/A-in-numeric-field/m-p/41810#M8573 HenkT 2010-06-29T09:28:36Z https://communities.sas.com/t5/SAS-Programming/A-in-numeric-field/m-p/41811#M8574 They are called special missing values. .A-.Z and ._ along with the regular missing the lone dot.<BR /> <BR /> <BR /> <A href="http://support.sas.com/documentation/cdl/en/lrcon/62955/HTML/default/viewer.htm#/documentation/cdl/en/lrcon/62955/HTML/default/a000992455.htm" target="_blank">http://support.sas.com/documentation/cdl/en/lrcon/62955/HTML/default/viewer.htm#/documentation/cdl/en/lrcon/62955/HTML/default/a000992455.htm</A> Tue, 29 Jun 2010 11:06:12 GMT https://communities.sas.com/t5/SAS-Programming/A-in-numeric-field/m-p/41811#M8574 data_null__ 2010-06-29T11:06:12Z