%DROPMISS - SAS
%DROPMISS - SAS
我一直在阅读如何从我的数据集中删除在每次观察中都具有空值的变量 - 似乎最好的方法是使用 %DROPMISS 宏函数 - 但是我遇到了错误msg - 下面是我正在尝试的代码和错误 msg
代码
%DROPMISS (DSIN=dataset1, DSOUT=dataset2);
日志
4665 %DROPMISS (DSIN=dataset1, DSOUT=dataset2);
-
180
WARNING: Apparent invocation of macro DROPMISS not resolved.
ERROR 180-322: Statement is not valid or it is used out of proper order.
您需要在使用前定义 dropmiss 宏。
您可以在附录中找到它（第 3 页）
http://support.sas.com/resources/papers/proceedings10/048-2010.pdf
或此处格式更佳：
/******************/
options nomprint noSYMBOLGEN MLOGIC;
/****************************/
%macro DROPMISS( DSNIN /* name of input SAS dataset
*/
, DSNOUT /* name of output SAS dataset
*/
, NODROP= /* [optional] variables to be omitted from dropping even if
they have only missing values */
) ;
/* PURPOSE: To find both Character and Numeric the variables that have only
missing values and drop them if
* they are not in &NONDROP
*
* NOTE: if there are no variables in the dataset, produce no variables
processing code
*
*
* EXAMPLE OF USE:
* %DROPMISS( DSNIN, DSNOUT )
* %DROPMISS( DSNIN, DSNOUT, NODROP=A B C D--H X1-X100 )
* %DROPMISS( DSNIN, DSNOUT, NODROP=_numeric_ )
* %DROPMISS( DSNIN, DSNOUT, NOdrop=_character_ )
*/
%local I ;
%if "&DSNIN" = "&DSNOUT"
%then %do ;
%put /------------------------------------------------\ ;
%put | ERROR from DROPMISS: | ;
%put | Input Dataset has same name as Output Dataset. | ;
%put | Execution terminating forthwith. | ;
%put \------------------------------------------------/ ;
%goto L9999 ;
%end ;
/*###################################################################*/
/* begin executable code
/*####################################################################/
/*===================================================================*/
/* Create dataset of variable names that have only missing values
/* exclude from the computation all names in &NODROP
/*===================================================================*/
proc contents data=&DSNIN( drop=&NODROP ) memtype=data noprint out=_cntnts_( keep=
name type ) ; run ;
%let N_CHAR = 0 ;
%let N_NUM = 0 ;
data _null_ ;
set _cntnts_ end=lastobs nobs=nobs ;
if nobs = 0 then stop ;
n_char + ( type = 2 ) ;
n_num + ( type = 1 ) ;
/* create macro vars containing final # of char, numeric variables */
if lastobs
then do ;
call symput( 'N_CHAR', left( put( n_char, 5. ))) ;
call symput( 'N_NUM' , left( put( n_num , 5. ))) ;
end ;
run ;
/*===================================================================*/
/* if there are no variables in dataset, stop further processing
/*===================================================================*/
%if %eval( &N_NUM + &N_CHAR ) = 0
%then %do ;
%put /----------------------------------\ ;
%put | ERROR from DROPMISS: | ;
%put | No variables in dataset. | ;
%put | Execution terminating forthwith. | ;
%put \----------------------------------/ ;
%goto L9999 ;
%end ;
/*===================================================================*/
/* put global macro names into global symbol table for later retrieval
/*===================================================================*/
%LET NUM0 =0;
%LET CHAR0 = 0;
%IF &N_NUM >0 %THEN %DO;
%do I = 1 %to &N_NUM ;
%global NUM&I ;
%end ;
%END;
%if &N_CHAR > 0 %THEN %DO;
%do I = 1 %to &N_CHAR ;
%global CHAR&I ;
%end ;
%END;
/*===================================================================*/
/* create macro vars containing variable names
/* efficiency note: could compute n_char, n_num here, but must declare macro names
to be
global b4 stuffing them
/*
/*===================================================================*/
proc sql noprint ;
%if &N_CHAR > 0 %then %str( select name into :CHAR1 - :CHAR&N_CHAR from
_cntnts_ where type = 2 ; ) ;
%if &N_NUM > 0 %then %str( select name into :NUM1 - :NUM&N_NUM from
_cntnts_ where type = 1 ; ) ;
quit ;
/*===================================================================*/
/* Determine the variables that are missing
/*
/*===================================================================*/
%IF &N_CHAR > 1 %THEN %DO;
%let N_CHAR_1 = %EVAL(&N_CHAR - 1);
%END;
Proc sql ;
select %do I= 1 %to &N_NUM; max (&&NUM&I) , %end; %IF &N_CHAR > 1 %THEN %DO;
%do I= 1 %to &N_CHAR_1; max(&&CHAR&I), %END; %end; MAX(&&CHAR&N_CHAR)
into
%do I= 1 %to &N_NUM; :NUMMAX&I , %END; %IF &N_CHAR > 1 %THEN %DO;
%do I= 1 %to &N_CHAR_1; :CHARMAX&I,%END; %END; :CHARMAX&N_CHAR
from &DSNIN;
quit;
/*===================================================================*/
/* initialize DROP_NUM, DROP_CHAR global macro vars
/*===================================================================*/
%let DROP_NUM = ;
%let DROP_CHAR = ;
%if &N_NUM > 0 %THEN %DO;
DATA _NULL_;
%do I = 1 %to &N_NUM ;
%IF &&NUMMAX&I =. %THEN %DO;
%let DROP_NUM = &DROP_NUM %qtrim( &&NUM&I ) ;
%END;
%end ;
RUN;
%END;
%IF &N_CHAR > 0 %THEN %DO;
DATA _NULL_;
%do I = 1 %to &N_CHAR ;
%IF "%qtrim(&&CHARMAX&I)" eq "" %THEN %DO;
%let DROP_CHAR = &DROP_CHAR %qtrim( &&CHAR&I ) ;
%END;
%end ;
RUN;
%END;
/*===================================================================*/
/* Create output dataset
/*===================================================================*/
data &DSNOUT ;
%if &DROP_CHAR ^= %then %str(DROP &DROP_CHAR ; ) ; /* drop char variables
that
have only missing values */
%if &DROP_NUM ^= %then %str(DROP &DROP_NUM ; ) ; /* drop num variables
that
have only missing values */
set &DSNIN ;
%if &DROP_CHAR ^= or &DROP_NUM ^= %then %do;
%put /----------------------------------\ ;
%put | Variables dropped are &DROP_CHAR &DROP_NUM | ;
%put \----------------------------------/ ;
%end;
%if &DROP_CHAR = and &DROP_NUM = %then %do;
%put /----------------------------------\ ;
%put | No variables are dropped |;
%put \----------------------------------/ ;
%end;
run ;
%L9999:
%mend DROPMISS ;
我一直在阅读如何从我的数据集中删除在每次观察中都具有空值的变量 - 似乎最好的方法是使用 %DROPMISS 宏函数 - 但是我遇到了错误msg - 下面是我正在尝试的代码和错误 msg
代码
%DROPMISS (DSIN=dataset1, DSOUT=dataset2);
日志
4665 %DROPMISS (DSIN=dataset1, DSOUT=dataset2);
-
180
WARNING: Apparent invocation of macro DROPMISS not resolved.
ERROR 180-322: Statement is not valid or it is used out of proper order.
您需要在使用前定义 dropmiss 宏。
您可以在附录中找到它（第 3 页） http://support.sas.com/resources/papers/proceedings10/048-2010.pdf
或此处格式更佳：
/******************/
options nomprint noSYMBOLGEN MLOGIC;
/****************************/
%macro DROPMISS( DSNIN /* name of input SAS dataset
*/
, DSNOUT /* name of output SAS dataset
*/
, NODROP= /* [optional] variables to be omitted from dropping even if
they have only missing values */
) ;
/* PURPOSE: To find both Character and Numeric the variables that have only
missing values and drop them if
* they are not in &NONDROP
*
* NOTE: if there are no variables in the dataset, produce no variables
processing code
*
*
* EXAMPLE OF USE:
* %DROPMISS( DSNIN, DSNOUT )
* %DROPMISS( DSNIN, DSNOUT, NODROP=A B C D--H X1-X100 )
* %DROPMISS( DSNIN, DSNOUT, NODROP=_numeric_ )
* %DROPMISS( DSNIN, DSNOUT, NOdrop=_character_ )
*/
%local I ;
%if "&DSNIN" = "&DSNOUT"
%then %do ;
%put /------------------------------------------------\ ;
%put | ERROR from DROPMISS: | ;
%put | Input Dataset has same name as Output Dataset. | ;
%put | Execution terminating forthwith. | ;
%put \------------------------------------------------/ ;
%goto L9999 ;
%end ;
/*###################################################################*/
/* begin executable code
/*####################################################################/
/*===================================================================*/
/* Create dataset of variable names that have only missing values
/* exclude from the computation all names in &NODROP
/*===================================================================*/
proc contents data=&DSNIN( drop=&NODROP ) memtype=data noprint out=_cntnts_( keep=
name type ) ; run ;
%let N_CHAR = 0 ;
%let N_NUM = 0 ;
data _null_ ;
set _cntnts_ end=lastobs nobs=nobs ;
if nobs = 0 then stop ;
n_char + ( type = 2 ) ;
n_num + ( type = 1 ) ;
/* create macro vars containing final # of char, numeric variables */
if lastobs
then do ;
call symput( 'N_CHAR', left( put( n_char, 5. ))) ;
call symput( 'N_NUM' , left( put( n_num , 5. ))) ;
end ;
run ;
/*===================================================================*/
/* if there are no variables in dataset, stop further processing
/*===================================================================*/
%if %eval( &N_NUM + &N_CHAR ) = 0
%then %do ;
%put /----------------------------------\ ;
%put | ERROR from DROPMISS: | ;
%put | No variables in dataset. | ;
%put | Execution terminating forthwith. | ;
%put \----------------------------------/ ;
%goto L9999 ;
%end ;
/*===================================================================*/
/* put global macro names into global symbol table for later retrieval
/*===================================================================*/
%LET NUM0 =0;
%LET CHAR0 = 0;
%IF &N_NUM >0 %THEN %DO;
%do I = 1 %to &N_NUM ;
%global NUM&I ;
%end ;
%END;
%if &N_CHAR > 0 %THEN %DO;
%do I = 1 %to &N_CHAR ;
%global CHAR&I ;
%end ;
%END;
/*===================================================================*/
/* create macro vars containing variable names
/* efficiency note: could compute n_char, n_num here, but must declare macro names
to be
global b4 stuffing them
/*
/*===================================================================*/
proc sql noprint ;
%if &N_CHAR > 0 %then %str( select name into :CHAR1 - :CHAR&N_CHAR from
_cntnts_ where type = 2 ; ) ;
%if &N_NUM > 0 %then %str( select name into :NUM1 - :NUM&N_NUM from
_cntnts_ where type = 1 ; ) ;
quit ;
/*===================================================================*/
/* Determine the variables that are missing
/*
/*===================================================================*/
%IF &N_CHAR > 1 %THEN %DO;
%let N_CHAR_1 = %EVAL(&N_CHAR - 1);
%END;
Proc sql ;
select %do I= 1 %to &N_NUM; max (&&NUM&I) , %end; %IF &N_CHAR > 1 %THEN %DO;
%do I= 1 %to &N_CHAR_1; max(&&CHAR&I), %END; %end; MAX(&&CHAR&N_CHAR)
into
%do I= 1 %to &N_NUM; :NUMMAX&I , %END; %IF &N_CHAR > 1 %THEN %DO;
%do I= 1 %to &N_CHAR_1; :CHARMAX&I,%END; %END; :CHARMAX&N_CHAR
from &DSNIN;
quit;
/*===================================================================*/
/* initialize DROP_NUM, DROP_CHAR global macro vars
/*===================================================================*/
%let DROP_NUM = ;
%let DROP_CHAR = ;
%if &N_NUM > 0 %THEN %DO;
DATA _NULL_;
%do I = 1 %to &N_NUM ;
%IF &&NUMMAX&I =. %THEN %DO;
%let DROP_NUM = &DROP_NUM %qtrim( &&NUM&I ) ;
%END;
%end ;
RUN;
%END;
%IF &N_CHAR > 0 %THEN %DO;
DATA _NULL_;
%do I = 1 %to &N_CHAR ;
%IF "%qtrim(&&CHARMAX&I)" eq "" %THEN %DO;
%let DROP_CHAR = &DROP_CHAR %qtrim( &&CHAR&I ) ;
%END;
%end ;
RUN;
%END;
/*===================================================================*/
/* Create output dataset
/*===================================================================*/
data &DSNOUT ;
%if &DROP_CHAR ^= %then %str(DROP &DROP_CHAR ; ) ; /* drop char variables
that
have only missing values */
%if &DROP_NUM ^= %then %str(DROP &DROP_NUM ; ) ; /* drop num variables
that
have only missing values */
set &DSNIN ;
%if &DROP_CHAR ^= or &DROP_NUM ^= %then %do;
%put /----------------------------------\ ;
%put | Variables dropped are &DROP_CHAR &DROP_NUM | ;
%put \----------------------------------/ ;
%end;
%if &DROP_CHAR = and &DROP_NUM = %then %do;
%put /----------------------------------\ ;
%put | No variables are dropped |;
%put \----------------------------------/ ;
%end;
run ;
%L9999:
%mend DROPMISS ;