SAS - code to dynamically count columns and sum each of them - sas

I’m wondering if someone can help with a coding problem I have.
Background – I have a project that imports some files and uses the data in those files to perform projections. The contents of the files determines some aspects of the size of the output that follows. Simply, values in data loaded in drives the size and shape of the tables that follow, and this can vary.
The following code is an example of the problem.
The data loaded will have a variable year start (note wf2009, 2009 is the first year) and variable range (this example goes from 2009 to 2030, but this will vary too).
proc summary data= labeled_proj_data_hc;
class jurisdiction specialty measure;
types jurisdiction*specialty*measure;
VAR wf2009--wf2030;
output out= sum_labeled_proj_data_hc
sum(wf2009) = y2009
sum(wf2010) = y2010
sum(wf2011) = y2011
sum(wf2012) = y2012;
run;
Where I’m not sure how to proceed is:
sum(wf2009) = y2009
sum(wf2010) = y2010
sum(wf2011) = y2011
sum(wf2012) = y2012;
In the sequence of lines calling for the sum of their respective columns, how can I make this dynamic so that the start year is populated from a variable and it increments yearly until the last year which is also variable.
Has anyone solved a similar problem.
Cheers,

Is renaming the variables necessary? If not then you can use the : wildcard operator to access all variables that begin with 'wf', then just put SUM= in the output statement, which will preserve the original names.
So your proc summary would look like this.
proc summary data= labeled_proj_data_hc;
class jurisdiction specialty measure;
types jurisdiction*specialty*measure;
VAR wf: ;
output out= sum_labeled_proj_data_hc
sum=;
run;

Related

Proper repeat statement for PROC genmod

I think the question is more related to SAS syntax than statistics and is about proper repeated statement for PROC genmod
I am trying to implement Poisson regression with log link and with robust error variance for survey data.
Here is a working code for non survey data that I tested and it works as intended:
proc genmod data = eyestudy;
class carrot id;
model lenses = carrot/ dist = poisson link = log;
repeated subject = id/ type = unstr;
estimate 'Beta' carrot 1 -1/ exp;
run;
Code above and more information about Poisson regression with log link and with robust error variance but fro non survey data is here: https://stats.idre.ucla.edu/sas/faq/how-can-i-estimate-relative-risk-in-sas-using-proc-genmod-for-common-outcomes-in-cohort-studies/
Below is an example how to use code for PROC genmod for survey analysis (but with dist=binomial link=identity and I think without robust error variance)
proc genmod data=nis10;
class seqnumt estiapt10;
model r_tet_not_utd = / dist=binomial link=identity;
weight provwt;
repeated subject=seqnumt(estiapt10);
where sex = 2;
run;
here strata variable name is estiapt10, cluster variable name is seqnumt and weight variable name is provwt.
Code above and more information about survey data analysis here: https://support.sas.com/resources/papers/proceedings13/272-2013.pdf
My strata variable name is CSTRATM, cluster variable name is CPSUM and weight variable name is PATWT. Dependent variable name is DIETNUTR independent variable name is age_group_var. My data is located in sas_stata. So I tryed this code:
proc genmod data=sas_stata;
class age_group_var id CPSUM CSTRATM;
model DIETNUTR = age_group_var/ dist = poisson link = log;
weight PATWT;
repeated subject = id/ type = unstr;
repeated subject = CPSUM(CSTRATM);
estimate 'Beta' age_group_var 1 -1/ exp;
run;
but it gave me warning:
WARNING: Only the last REPEATED statement is used.
As I understand after reading articles above and some other material I am doing everything right except not the proper repeated statement. For Poisson regression with log link and with robust error variance for survey data I assume there should be some combination of two repeated statements in my code above. I tried several variants of combining those repeated statements but without any luck.
So my question is: What is the code for Poisson regression with log link and with robust error variance for survey data?
I am not quite sure I understood what CPSUM(CSTRATM) is. But I am assuming you are looking to use a interactive or nested effect as the subject.
Assuming x = CPSUM(CSTRATM), you could code up the effect as:
repeated subject = id * x
A full survey of coding up effects can be found at
https://support.sas.com/documentation/cdl/en/statug/63347/HTML/default/viewer.htm#statug_genmod_sect038.htm
This might be a useful read also:
https://support.sas.com/resources/papers/proceedings/proceedings/sugi29/188-29.pdf

SAS set statement using colon and creating a filename variable

So using SAS, I have a number of SAS monthend datasets named as follows:
mydata_201501
mydata_201602
mydata_201603
mydata_201604
mydata_201605
...
mydata_201612
Each has account information at particular monthend. I want to stack the datasets all into one dataset using colon rather than writing out the full set statement as follows:
data mynewdata;
set mydata_:;
run;
However there is no datestamp variable within the datasets so when I stack them I will lose the monthend information for each account. I want to know which line refers to which monthend for each account. Is there a way I can automatically create a variable that names the table the row come from. for example the long winded way would be this:
data mynewdata;
set mydata_201501 (in=a) mydata_201502 (in=b) mydata_201503 (in=c)...;
if a then tablename = 'mydata_201501';
if b then tablename = 'mydata_201502';
if c...
run;
but is there a quicker way using colon along these lines?
data mynewdata;
set mydata_:;
tablename = _tablelabel_;
run;
thanks
I always find clicking on comment links annoying, so hopefully here's the answer in your context. Use the INDSNAME= SET statement option to assign the dataset name to a variable:
data mynewdata;
set mydata_: indsname=_tablelabel_;
tablename = _tablelabel_;
run;
N.B. you can call _tablelabel_ whatever you want, and you may wish to change it so it doesn't look like a SAS generated variable name.
INDSNAME= only became a SAS SET statement option in version 9.2
Just to be clear, with my particular code, where the datasets were named mydata_yyyymm and I wanted a monthend variable with datestamp, I was able to produce this using the solution provided by mjsqu as follows (obs and keep statement provided if required):
data mynewdata;
set mydata_: (obs=100 keep=xxx xxx) indsname=_tablelabel_;
format monthend yymmdd10.;
monthend = input(scan(_tablelabel_,-1,'_'),yymmn6.);
run;

Assigning index to two concatenated tables in SAS?

I have two table with exactly the same column headers and one row each. I have the code to concatenate them which works fine.
data concatenation;
set CURR_CURR CURR_30;
run;
However, there is no index in the output to say which row corresponds to which table.
I've tried using 'create index' and 'index create' already but they don't work syntactically. Simply I'd just want to add a column of strings and move it to the front of all the other columns in the data set.
INDSNAME option on the SET statement + variable to store the information.
If you set the length statement ahead of your SET statement it will create it as the first column.
Just a note that this isn't the same as an 'index'. An index in SAS has a different meaning which isn't what you're trying to create here.
data concatenation;
length dset source $50.;
set CURR_CURR CURR_30 indsname=source;
dset=source;
run;
Reeza's answer is very similar to something I figured out that worked as well. Here's my version as an alternative.
data concatenation;
length id $ 10;
set CURR_CURR (in=a) CURR_30 (in=b);
if a then id = 'curr_curr';
else if b then id = 'curr_30';
run;

Search through the data with a loop or nested loops in SAS

I am rather a beginner in SAS. I have the following problem. Given is a big data set (my_time) which I imported into SAS looking as follows
I want to implement the following algorithm
for every account look for a status and if it is equal to na then look for the same contract after one year (one year after it gets the status na) and put the information "my_date", "status" and "money" in three new columns "new_my_date", "new_status" and "new_money" like in
I need something like countifs in excel. I found loops in SAS like DO but not for the purpose to look through all rows.
I do not even know for which key word I have to look.
I would be grateful for any hint.
A simple method would be by sorting, then exploiting the special variable prefix first. and retain statement to get the desired result.
Step 1: Sort by account, date, and status
proc sort data=have;
by account my_date status;
run;
This will guarantee that your data is in the order that you need. Since we are looking only for year+1 after the status = 'na', anything that happens in-between that doesn't matter.
Step 2: Use a data step to remember the first year when na happens for that account
data want;
set have;
by account my_date status;
retain first_na_year first_na_account;
if(first.account) then call missing(first_na_year,first_na_account);
if(status IN('na', 'tna') ) then do;
first_na_year = year;
first_na_month = month;
first_na_account = account;
end;
if( year = first_na_year+1
AND first_na_month = month
AND account = first_na_account)
AND status NOT IN('na', 'tna') )
then do;
new_status = status ;
new_my_date = my_date;
new_money = money;
end;
if(cmiss(new_status, new_my_date, new_money) ) = 0;
drop first:;
run;
For each row, we compare three things:
Is the status not 'na'?
Is the year 1 year bigger than the last time it was 'na'?
Is this the same account we're comparing?
If all are true, then we want to create the three new variables.
What's happening:
SAS is inherently a looping language, so we do not need to use a do loop here. When SAS goes to a new row, it will clear all variables in the Program Data Vector (PDV) in preparation for filling them in with the new values in the row.
Since SAS the SAS data step only goes forwards and doesn't like to go backwards, we want it to remember the first time that na occurs for that account. retain tells SAS not to discard the value of a variable when it reads a new row.
When we are done doing our comparison and we've moved onto the next account, we reset these variables to missing. by group processing allows SAS to know exactly where the first and last occurrence of the account is in the dataset.
At the end, we output only if all 3 of the new variables are not missing. cmiss counts how many variables are not missing. Note that output is always implied before the run statement, so we simply need to use an "if without then" in this case.
The final statement, drop first:;, is a simple shortcut to remove any variables that start with the phrase first. This prevents them from being shown in the final dataset.

How can I write a DATA step that will drop all variables from the input dataset except the ones that I explicitly define within the dataset?

I want to generate a new SAS dataset using table foo as the input and one-to-one correspondence with records in the output dataset bar. I wand to drop variables from foo by default but I also require all of the fields of foo be available (to derive new variables) and also that some variables from foo to be kept (if explicitly indicated).
I'm currently managing an explicit list of variables to drop= but it results in long and unwieldy syntax in the data-set-option declaration.*
DATA bar (drop=id data_value2);
set foo;
new_id = id;
data_value1 = data_value1; /* Explicitly included for clarity */
new_derived_data_value = data_value2 * 2; /* etc. */
format new_id $fmt_id.
data_value1 $fmt_dat.
new_derived_data_value $fmt_ddat.
;
RUN;
The output table I want should have only fields data_value1, new_data and new_derived_data_value.
I'm looking for the most syntactically succinct way of reproducing the same effect as :
SELECT
id AS new_id
,data_value1
,data_value2 * 2 AS new_derived_data_value
FROM foo
How can I write a DATA step that will drop all variables from the input dataset except the ones that I explicitly define within the dataset?
* Update: I could use aaa--hhh type notatation but even this can be unwieldy if the ordering of the variables changes over time or I later decide I'd like to keep variable ddd.
I would store the variable names in a macro list, obtained from the DICTIONARY tables. You can then drop them all easily in a data step. e.g.
proc sql noprint;
select name into :vars separated by ' '
from dictionary.columns
where libname = 'SASHELP' and memname='CLASS';
quit;
data want (drop=&vars.);
set sashelp.class;
name1=name;
age1=age;
run;
Keith's solution is the best production solution, but a quick alternative assuming you know the first and last variables in the dataset:
data want;
set class;
drop name--weight;
name1=name;
age1=age;
run;