Im looking do a probt for a column of values in sas not just one and to give two tailed p values.
I have the following code Id like to amend
data all_ssr;
x=.551447;
df=25;
p=(1-probt(abs(x),df))*2;
put p=;
run;
however I would like x to be a column of values within another file. I have tried work.ttest which is just a file of ttest values.
Many thanks
You need to use a set statement to access data from another SAS dataset.
data all_ssr;
set work.ttest; /*Dataset containing column of values*/
df=25;
p=(1-probt(abs(x),df))*2;
run;
Removing the put statement avoids clogging up the log.
Related
In SAS, I have a table that have 1000 rows. I am trying to separate that table into two tables. Row1-500 to Table A and row501-100 to table B. What is the code that can do this function. Thank you all for helping!
I am searching the code online and cannot get anything on google, help is appreciated.
The DATA statement lists the output tables of the step. An OUTPUT statement explicitly sends a row to each of the output tables. An explicit OUTPUT <target> ... <target-k> statement sends records to the specified tables only. The automatic implicit loop index variable _n_ can act as a row counter when a single data set is being read with SET.
Try
data want1 want2;
set have;
if _n_ <= 500 then output want1; else output want2;
run;
However, you may be better served by creating a categorical variable that can be used later in WHERE or BY statements.
Maybe the set options will help.Try firstobs= and obs= to choose the rows you want.
Here is how to use them:
data want1;
set have(obs=500);
run;
data want2;
set have(firstobs=501 obs=1000);
run;
I have an Excel file that always has the same name but the contents of the table changes. I am looking to write a code that names the table based on the value in one of the cells.
For example:
If cell A3 equals "Employment Information", I want the table to be named "Jobs".
If cell A3 equals "Inflation Information", I want the table to be named "Currency".
etc.
I want to define ONE macro (i.e. %table(filename,cell)), or ONE loop of if then else statements to achieve this. Unfortunately, I can't seem to wrap my head around this logically. If someone with experience in SAS could help me out that would be awesome. I will edit my question soon to include some codes that I have already tried but which have failed to get the job done.
You need to read the data to find the content. You could then create a macro variable to make it easy to rename the dataset using PROC DATASETS.
Let's assume you have converted the Excel sheet into a dataset named WORK.HAVE. Let's also assume that you know what variable contains the data from column A, let's call that variable A. Is there anything in the data that makes it possible to tell which observation is the one to use? For now let's just assume that by A3 you mean the second observation since the first row of the sheet should have the variable names.
So in that case you want something like this:
%let newname=have;
data _null_;
set have (firstobs=2);
if A="Employment Information" then call symputx('newname','Jobs');
else if A="Inflation Information" then call symputx('newname','Currency');
stop;
run;
proc datasets nolist lib=work;
change have=&newname;
run;
quit;
I am working with multiple waves of survey data. I have finished defining formats and labels for the first wave of data.
The second wave of data will be different, but the codes, labels, formats, and variable names will all be the same. I do not want to define all these attributes again...it seems like there should be a way to export the PROC CONTENTS information for one dataset and import it into another dataset. Is there a way to do this?
The closest thing I've found is PROC CPORT but I am totally confused by it and cannot get it to run.
(Just to be clear I'll ask the question another way as well...)
When you run PROC CONTENTS, SAS tells you what format, labels, etc. it is using for each variable in the dataset.
I have a second dataset with the exact same variable names. I would like to use the variable attributes from the first dataset on the variables in the second dataset. Is there any way to do this?
Thanks!
So you have a MODEL dataset and a HAVE dataset, both with data in them. You want to create WANT dataset which has data from HAVE, with attributes of MODEL (formats, labels, and variable lengths). You can do this like:
data WANT ;
if 0 then set MODEL ;
set HAVE ;
run ;
This works because when the DATA step compiles, SAS builds the Program Data Vector (PDV) which defines variable attributes. Even though the SET MODEL never executes (because 0 is not true), all of the variables in MODEL are created in the PDV when the step compiles.
Importantly, note that if there are corresponding variables with different lengths, the length from MODEL will determine the length of the variable in WANT. So if HAVE has a variable that is longer than the same-named variable in MODEL, it may be truncated. Options VARLENCHK determines whether or not SAS throws a warning/error if this happens.
That assumes there are no formats/labels on the HAVE dataset. If there is a variable in HAVE that has a format/label, and the corresponding variable in MODEL does not have a format/label, the format/label from HAVE will be applied to WANT.
Sample code below.
data model;
set sashelp.class;
length FavoriteColor $3;
FavoriteColor="Red";
dob=today();
label
dob='BirthDate'
;
format
dob mmddyy10.
;
run;
data have;
set sashelp.class;
length FavoriteColor $10;
dob=today()-1;
FavoriteColor="Orange";
label
Name="HaveLabel"
dob="HaveLabel"
;
format
Name $1.
dob comma.
;
run;
options varlenchk=warn;
data want;
if 0 then set model;
set have;
run;
I'd create an empty dataset based on the existing one, and then use proc append to append the contents to it.
Create some sample data for the second round of data:
data new_data;
age = 10;
run;
Create an empty dataset based on the original data:
proc sql noprint;
create table want like sashelp.class;
quit;
Append the data into the empty dataset, retaining the details from the original:
proc append base=want data=new_data force nowarn;
run;
Note that I've used the force and nowarn options on proc append. This will ensure the data is appended even if differences are found between the two datasets being used. This is expected if you have, for example, format differences. It will also hide things like if columns exist in the new table that aren't in the old table etc. So be careful that this is doing what you want it to. If the behaviour is undesirable, consider using a datastep to append instead (and list the want dataset first).
Welcome to the stack.
If you want to copy the properties of the table without the data within it, you could use PROC SQL or data step with zero rows read in.
This examples copies all information about the SASHELP.CLASS dataset into a brand new dataset. All formats, attributes, labels, the whole thing is copies over. If you want to only copy some of the columns, specify them in select clause instead of asterix.
PROC SQL outobs=0;
CREATE TABLE WANT as SELECT * FROM SASHELP.CLASS;
QUIT;
Regards,
Vasilij
I'm dealing with one data problem in sas.
I have one dateset including 1000 variables and 1000 records for each variable.
And I have another variable list which includes 100 variable names.
I'd like to subset the first dataset when the variable names in that dataset match the variable list.
I tried proc merge and proc sql, but cannot work it out.
Could any one help me out?
Thanks a lot
SAS keeps or drops variables with the conveniently named keywords 'keep' and 'drop'. PROC SQL can help you generate a list if you don't already have it in text format.
data want;
set have;
keep var1 var2 var3 var4;
run;
If you have the list of variables in dataset "vnames" with the variable "tokeep", you can do this:
proc sql;
select tokeep into :keeplist separated by ' ' from vnames;
quit;
data want;
set have;
keep &keeplist.;
run;
PROC SQL is taking the contents of 'tokeep' and instead of selecting them to a table or the screen, putting them in a space-delimited list inside a macro variable 'keeplist', which then is used as the arguments for the 'keep' statement.
Here you can find how to output a list of all the variable names of a dataset as another dataset. This will make it way easier to decide which of the big datasets you will use and which you will not (e.g. a left (or right) join of variable names, then look at the number of rows is at least the count of variables which you want to have).
I need to change the variable length in a existing dataset. I can change the format and informat but not the length. I get an error. The documentation says this is possible but there are no examples.
Here is my issue. My data source could change so I don't want to pre define columns on import. I want to do a generic import and then look for certain columns and adjust the length.
I have tried PROC SQL and DATA steps. It looks like the only way to do this is to recreate the dataset or the column. Which I don't want to do.
Thanks,
Donnie
If you put your LENGTH statement before the SET statement, in a Data step, you can change the length of a variable. Obviously, you will get truncation if you have data longer than your new length.
However, using a DATA step to change the length is also re-creating the data set, so I'm confused by that part of your question.
The only way to change the length of a variable in a datastep is to define it before a source (SET) dataset is read in.
Conversely you can use an alter statement in a proc sql. SAS support alter statement
Length of a variable remains same once you set the dataset. Add length statements before you set the dataset if you need to change length of a columns
data a;
length a, b, c $200 ;
set b ;
run ;