topic Re: Transposing in a Stacking Manner in SAS Programming

Transposing in a Stacking Manner

djbateman — Mon, 07 May 2018 18:04:43 GMT

I need help with transposing some datasets. I have multiple datasets that I need transposed by some ID variables.

Below is a sample of one dataset and the transpose procedure I am attempting to use.

data DSIS2;
      input STUDYID $12. +2 SITEID $3. +2 SUBJID $11. +2 STDYPRD 1. +2 PNINTSLP 1. +2 OPENDATE date9. +2 OPENTIME time5. +2 SAVEDATE date9. +2 SAVETIME time5.;
      format OPENDATE SAVEDATE date9. OPENTIME SAVETIME time5.;
      cards;
VX16-150-102  022  102-022-002  1  4  12DEC2017  10:19  12DEC2017  10:19
VX16-150-102  022  102-022-002  1  5  13DEC2017  10:01  13DEC2017  10:01
VX16-150-102  022  102-022-002  1  8  14DEC2017  10:01  14DEC2017  10:01
VX16-150-102  022  102-022-002  1  5  15DEC2017  10:01  15DEC2017  10:02
VX16-150-102  022  102-022-002  1  7  16DEC2017  10:00  16DEC2017  10:01
VX16-150-102  022  102-022-002  1  4  17DEC2017  10:00  17DEC2017  10:00
VX16-150-102  022  102-022-002  1  6  18DEC2017  10:01  18DEC2017  10:01
VX16-150-102  022  102-022-002  1  7  19DEC2017  05:56  19DEC2017  05:56
;
run;

proc transpose data=DSIS2 out=DSIS2_T;
      by studyid siteid subjid;
      var stdyprd pnintslp opendate opentime savedate savetime;
run;

My goal is to get something that looks like this (spacing between groups just for demonstration--I don't actually need a blank line between groups):

VX16-150-102  022  102-022-002  STDYPRD  1
VX16-150-102  022  102-022-002  PNINTSLP 4
VX16-150-102  022  102-022-002  OPENDATE 12DEC2017
VX16-150-102  022  102-022-002  OPENTIME 10:19
VX16-150-102  022  102-022-002  SAVEDATE 12DEC2017
VX16-150-102  022  102-022-002  SAVETIME 10:19

VX16-150-102  022  102-022-002  STDYPRD  1
VX16-150-102  022  102-022-002  PNINTSLP 5
VX16-150-102  022  102-022-002  OPENDATE 13DEC2017
VX16-150-102  022  102-022-002  OPENTIME 10:01
VX16-150-102  022  102-022-002  SAVEDATE 13DEC2017
VX16-150-102  022  102-022-002  SAVETIME 10:01

VX16-150-102  022  102-022-002  STDYPRD  1
VX16-150-102  022  102-022-002  PNINTSLP 6
VX16-150-102  022  102-022-002  OPENDATE 14DEC2017
VX16-150-102  022  102-022-002  OPENTIME 10:01
VX16-150-102  022  102-022-002  SAVEDATE 14DEC2017
VX16-150-102  022  102-022-002  SAVETIME 10:01

VX16-150-102  022  102-022-002  STDYPRD  1
VX16-150-102  022  102-022-002  PNINTSLP 5
VX16-150-102  022  102-022-002  OPENDATE 15DEC2017
VX16-150-102  022  102-022-002  OPENTIME 10:01
VX16-150-102  022  102-022-002  SAVEDATE 15DEC2017
VX16-150-102  022  102-022-002  SAVETIME 10:02

etc...

When you open DSIS2_T, you'll see that I actually get a new column for each row (which I understand is what transposing does). But I basically want a stacked transposition. Is there a shortcut way to do this rather than looping through and setting the dataset and only keeping the ID variables and the new variable of interest?

As an added caveat, notice that the date and time variables lose their formatting. I want to keep the formatting. Also, I have several datasets that I am trying to transpose and then stack on top of each other. In this case, all the variables are numeric, so they come out as numeric columns, but some datasets may contain character variables, in which case I want to make all the columns character. Is this possible in a shortened way?

My current process is:

Get a list of all the datasets I want transposed
Loop through each dataset (m times)
Get a list of all the variables I want stacked from dataset[m]
Loop through each variable (n times)
Determine the variable[n] type
Using a SET statement, stack dataset[m] n times keeping only the ID variables and variable[n] for each set but renaming a character variable to CHAR and a numeric variable to NUM to create TABLE[m]
Make all numeric variables character using PUT()
Stack all TABLE[m] into a single table

There must be a simpler way than this!

Re: Transposing in a Stacking Manner

ballardw — Mon, 07 May 2018 18:24:41 GMT

The desired result you show is not possible for all numeric values. Reason: only one format may be applied to a variable. Your appearance for your example data indicates a desire for multiple formats. At which point the process might be: determine the numeric variables, create a text version and then use a process that works for character variables.

Example:

data DSIS2;
      input STUDYID $12. +2 SITEID $3. +2 SUBJID $11. +2 STDYPRD $1. +2 PNINTSLP $1. +2 OPENDATE $9. +2 OPENTIME $5. +2 SAVEDATE $9. +2 SAVETIME $5.;
      cards;
VX16-150-102  022  102-022-002  1  4  12DEC2017  10:19  12DEC2017  10:19
VX16-150-102  022  102-022-002  1  5  13DEC2017  10:01  13DEC2017  10:01
VX16-150-102  022  102-022-002  1  8  14DEC2017  10:01  14DEC2017  10:01
VX16-150-102  022  102-022-002  1  5  15DEC2017  10:01  15DEC2017  10:02
VX16-150-102  022  102-022-002  1  7  16DEC2017  10:00  16DEC2017  10:01
VX16-150-102  022  102-022-002  1  4  17DEC2017  10:00  17DEC2017  10:00
VX16-150-102  022  102-022-002  1  6  18DEC2017  10:01  18DEC2017  10:01
VX16-150-102  022  102-022-002  1  7  19DEC2017  05:56  19DEC2017  05:56
;
run;

data DSIS2_t;
   set DSIS2;
   array vars stdyprd pnintslp opendate opentime savedate savetime;
   length varname $ 32 value $ 10;
   do i= 1 to dim(vars);
      varname = vname(vars[i]);
      value   = vars[i];
      output;
   end;
   keep studyid siteid subjid varname value;
run;

Please describe how the resulting data is to be used. Almost any analysis with that data structure will be extremely difficult at best.

If the only reason you want that appearance is for a report then a report procedure may be of more use.

Re: Transposing in a Stacking Manner

djbateman — Mon, 07 May 2018 18:29:32 GMT

Thank you. I think I can deal with converting all numeric variables to character before transposing. That will certainly clear up the second issue.

The data will be used to see where missing values are contained. We have a spec that describes the dataset design. We want to merge the design with the actual data to see if we are missing any values that expected in the database. I hope that makes sense.

Re: Transposing in a Stacking Manner

data_null__ — Mon, 07 May 2018 18:44:31 GMT

@djbateman wrote:
Thank you. I think I can deal with converting all numeric variables to character before transposing. That will certainly clear up the second issue.

The data will be used to see where missing values are contained. We have a spec that describes the dataset design. We want to merge the design with the actual data to see if we are missing any values that expected in the database. I hope that makes sense.

If you add a character variable (dummy perhaps) to the VAR list in PROC TRANSPOSE SAS will do the conversion to numeric for you using any formats associated with the variables. I call it VVALUE en masse.

Re: Transposing in a Stacking Manner

djbateman — Mon, 07 May 2018 18:58:03 GMT

Thanks. That's an excellent idea! Now I just need to see if I can transpose in a stacking manner. It seems my best bet is to simply stack via a loop rather than trying to transpose.

Re: Transposing in a Stacking Manner

data_null__ — Tue, 08 May 2018 12:43:45 GMT

@djbateman wrote:
Thanks. That's an excellent idea! Now I just need to see if I can transpose in a stacking manner. It seems my best bet is to simply stack via a loop rather than trying to transpose.

Here is the code I was thinking of. Since you need transpose by OBS but your BY variables are not unique I created a RECID to get the output you show as DSIS2_T.

data DSIS2;
      input STUDYID $12. +2 SITEID $3. +2 SUBJID $11. +2 STDYPRD 1. +2 PNINTSLP 1. +2 OPENDATE date9. +2 OPENTIME time5. +2 SAVEDATE date9. +2 SAVETIME time5.;
      format OPENDATE SAVEDATE date9. OPENTIME SAVETIME time5.;
      retain dummy '1';
      recid = _n_;
      cards;
VX16-150-102  022  102-022-002  1  4  12DEC2017  10:19  12DEC2017  10:19
VX16-150-102  022  102-022-002  1  5  13DEC2017  10:01  13DEC2017  10:01
VX16-150-102  022  102-022-002  1  8  14DEC2017  10:01  14DEC2017  10:01
VX16-150-102  022  102-022-002  1  5  15DEC2017  10:01  15DEC2017  10:02
VX16-150-102  022  102-022-002  1  7  16DEC2017  10:00  16DEC2017  10:01
VX16-150-102  022  102-022-002  1  4  17DEC2017  10:00  17DEC2017  10:00
VX16-150-102  022  102-022-002  1  6  18DEC2017  10:01  18DEC2017  10:01
VX16-150-102  022  102-022-002  1  7  19DEC2017  05:56  19DEC2017  05:56
;
run;
proc transpose data=DSIS2 out=DSIS2_T(where=(upcase(_name_) ne 'DUMMY'));
   by studyid siteid subjid recid;
   var dummy stdyprd pnintslp opendate opentime savedate savetime;
   run;
proc print;
   run;

Re: Transposing in a Stacking Manner

Reeza — Tue, 08 May 2018 00:30:26 GMT

Rather than transpose the dataset I would use PROC FREQ to list the values in the data and use ODS to capture that into a single table. Then you can compare it against your master list, without having to transform the original data.

@djbateman wrote:

The data will be used to see where missing values are contained. We have a spec that describes the dataset design. We want to merge the design with the actual data to see if we are missing any values that expected in the database. I hope that makes sense.