I am trying to understand the output of the following proc format; This is the proc format, /**************************************************************** * Define a format to replicate the database code values ****************************************************************/ proc format; value dirlabel -1001 = 'N' -1002 = 'NNE' -1003 = 'NE' -1004 = 'ENE' -1005 = 'E' -1006 = 'ESE' -1007 = 'SE' -1008 = 'SSE' -1009 = 'S' -1010 = 'SSW' -1011 = 'SW' -1012 = 'WSW' -1013 = 'W' -1014 = 'WNW' -1015 = 'NW' -1016 = 'NNW'; run;   When the following line of code is run when prevwnd == -1017,  the wndclimoprevaidirectcode is set to *** (3 asteriks) wndclimoprevaidirectcode = put(prevwnd,dirlabel.);   Is that because the -1017 is not in the proc format as a value?  Is this what it is supposed to do? ... View more

I'm new to SAS. I have the following code but have no idea what the x1, x2, and x3 do in the second univariate. They later get dropped.   /**************************************************************** * basic hour counts, beginning and ending ob times ****************************************************************/ proc univariate data=indat noprint; by year mo gp hr; var observationtime; output out = sample n = samplesizeqty min = begindate max = enddate;   /**************************************************************** * yearly month counts, beginning and ending ob times ****************************************************************/ proc univariate data=sample noprint; by year mo; var samplesizeqty begindate enddate; output out = sample2 sum = samplesizeqty min = x1 begindate max = x2 x3 enddate;   data sample2; set sample2; by year mo; gp = 1; hr = 24; drop x1-x3; run;   proc sort data=sample2; by year mo gp hr;   data sample; merge sample sample2; by year mo gp hr; run; ... View more