Astounding PROC Star Re: sort by multiple variable Posted 09-18-2018 02:43 PM (1773 views) | In reply to jojozheng Try it this way: data want; set have; by id; retain dummy; if first.id then dummy=flag; else dummy + flag; if dummy=1 then do; flag1=1; dummy=2; end; ...
proc sort data=emp95_byidnum; by idnum; run; proc sort data=emp96_byidnum; by idnum; run; title 'Comparing Observations that Have Matching IDNUMs'; proc compare base=emp95_byidnum compare=emp96_byidnum listall; id idnum; run; * Example of syntax for saving differences in output dat...
Permanent, up to 50% faster with PROC SORT if merging datasets, up to 100% slower without PROC SORT, may prevent other procedures such as PROC APPEND Hash Tables Direct access by key variable value,reference datasets within DATA steps as a multiple dimensional array but with both numeric and...
Group-by processing Group-by processing Build models, compute and process results on the fly for each group or segment without having to sort or index the data each time. Build segment-based models instantly (i.e., stratified modeling) from a decision tree or clustering analysis. Model compari...
第一种:set data1 data2;然后再执行proc sort。 第二种:set data1 data2;by variable;这种效率比第一种高,虽然不知道why...但是书上这么说的。我觉得可能是数据读取次数的问题吧,第二种只需要读一次,第一种要读两次 set语句从一个或多个sas数据集中读取观测值并实现纵向合并,每一个set语句执行时,sas就会...
The SAS NODUP is the option and feature to check and remove the duplicate datas in all the sets of variables. At the same time, the NODUPKEY helps remove the variable listed using the BY Statement. Q2. What is PROC SORT in SAS NODUPKEY?
The BY variables themselves aren’t transposed. The variables need to be sorted before running PROC TRANSPOSE. You can sort the variables with PROC SORT. VAR -[Transpose Column] It lists the actual data that needs to be transposed. If you do not include a VAR statement, the procedure will...
but it's generally not what I would want to do when applying conditional logic. I had thought that these sort of situations where SAS operateson one row depending on what was in the previous row only happen when there is a "BY" statement, but obviously that's incorrect as there is ...
1. sort data 默认ascending proc sortdata = datasetout=dataset; by(descending) variable; run; Example: Sumvariable; Create Subtotals for Variable Groups BYvariable;[按照某一个variable分组,会生成分开的data report] when id and by结合在一起用: ...
In other words, to use a BY statement in any PROC or DATA step the input dataset must already be sorted by the variables you list in the BY statement. Datasets can be sorted by multiple variables to further specify the order of observations. The SORT procedure orders the dataset in ...