oncology sas programming interview questions

In other words,The MEAN function will sum across the row and a procedure will SUM down a column.ġ0. The average that is calculated using PROC MEANS is the sum of all of the values of a variable divided by the number of observations in the variable. The MEAN function is an average of the value of several variables in one observation. Name and describe functions that you have used for data cleaning? PROC MEANS produce the 'default' statistics of N, MIN, MAX, MEAN and STD DEV. Run 7.What are the default statistics that PROC MEANS produce? proc print data = readin (firstobs=5 obs=10) The FIRSTOBS= and OBS=data set options would tell SAS to print observations 5 through 10 from the data set READIN. How to print observations 5 through 10 from a data set? The main difference between DROP/ KEEP statement and DROP=/ KEEP=data set option is that you can not use DROP/KEEP statement in procedures.

The KEEP statement specifies the names of the variables that you want to retain from the data set. The DROP statement specifies the names of the variables that you want to remove from the data set. DROP, KEEP Statements and Data set Options How to include or exclude specific variables in a data set? The double trailing sign SAS rather than advancing to a new record, hold the current input record for the execution of the next INPUT statement.ĥ. to read a single field in each record of raw data and to assign values to the variable ID. This DATA step uses the numeric informat 4. The following is an example of an external file that contains data: Truncover - It assigns the raw data value to the variable even if the value is shorter than the length that is expected by the INPUT statement. Instead, MISSOVER setsvariables to missing. Missover -When the MISSOVER option is used on the INFILE statement, the INPUT statement does not jump to the next line when reading a short line. Difference between Missover and Truncover tells SAS to read the number121713as the date December 17, 2013.įormat - To tell SAS how to print the variables. Informat - To tell SAS that a number should be read in a particular format.įor example: the informat mmddyy6. Informats read the data while Formats write the data. In the example shown above, ID and SEX are numeric variables and Name a character variable.Ģ. Note : The variable name, followed by $ (dollar sign), idenfities the variable type as character. The INFILE statement is used to identify an external file while the INPUT statment is used to describe your variables.

The questions cover a wide range of topics, from simple theoretical concepts to tricky interview questions for both freshers and experienced SAS programmers. This will give you the confidence to crack your SAS interview. Below are the most frequently asked SAS interview questions, along with answers.

Oncology sas programming interview questions