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Sas Interview Questions And Answers

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Advanced Sas Interview Questions For Experienced

Q11). Name a few data types that are frequently used in SAS.

Answer to Advanced SAS Interview Questions:

They are divided into two categories majorly Character and Numeric.

Q12). How will you differentiate functions and procedures in SAS?

Answer to Advanced SAS Interview Questions:

In the case of functions, the values of arguments are supplied across an observation. In the case of procedures, there is only one given to each variable.

Q13). How are SUM function and + operator different in SAS?

Answer to Advanced SAS Interview Questions:

Sum function will return the total of non-missing arguments and the + operator returns the missing value of any argument value left behind.

Q14). What is the benefit of the end = data set option in SAS?

Answer to Advanced SAS Interview Questions:

To read the last value from an unsorted dataset to appear in the new data set, end = data set option is used in SAS.

Q15). Give an example when SAS is not able to convert the character value to numeric value automatically.

Answer to Advanced SAS Interview Questions:

When a dollar sign is added before a variable, the conversion process is blocked by the dollar sign and it is not converted to numeric values later.

Q16). How will you differentiate the PROC SUMMARY and the PROC MEANS?

Answer to Advanced SAS Interview Questions:

Proc Means produce statistics for subgroups only if it is sorted first. On the other hand, Proc Summary can produce statistics for all groups automatically.

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Advanced Sas Interview Questions

36) What is the command used to find the missing values?

Ans: Command used to find the missing values is

missing_values=MISSING

37)How to create multiple observations from a single observation?

Ans: Using double trailing @@ we can create multiple observations from a single observation.

38)What is the use of %include statement?

Ans: %INCLUDE statement reads the entire file into the current SAS program we are running and submits the file to the SAS system immediately.

39)What are the scrubbing procedures in SAS?

Ans: The scrubbing procedures in SAS are NODUPKEY and Proc Sort option. It eliminates the duplicate values.

40) What is the difference between DO WHILE and DO UNTIL?

Ans: Difference between DO UNTIL and DO WHILE statements is that DO WHILE expression is evaluated at the top of DO loop. DO loop is executed for the first time, if the expression is false, then it will never execute. But DO UNTIL executes at least once.

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What Do You Know About The Program Verification

It simply makes sure that all the tables in the domain are accurate and are good enough to be considered for the long run. The overall quality of the SAS program can also be managed through it. Also, the users can simply justify the needs of some special tables.

Also, the subsets of the final summary of the tables can be changed through them. The procedure is very much the same as that of macro validation and the very step is always to create a document and then passing it from the input parameters.

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Sas Macro Interview Questions And Answers

Job Interview Questions: SAS Interview Questions You

The Indeed Editorial Team comprises a diverse and talented team of writers, researchers and subject matter experts equipped with Indeed’s data and insights to deliver useful tips to help guide your career journey.

Statistical Analysis Software has a programming feature named Macro that enables the creation of dynamic variables within codes and the omission of repetitive sections. The SAS macro feature empowers SAS programmers to code with efficiency, creating several job opportunities in the technology industry. Understanding the basics of this feature and how to answer interview questions on this topic can help you create a good impression in your technical interview rounds. In this article, we provide some SAS macro interview questions, answers and tips to help you prepare for your interview.

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Tell Us What You Know About Iss And Ise

The interviewer is gauging your knowledge on a particular concept of Clinical SAS. You must have interacted with ISS and ISE. Give a conclusive and convincing answer to the interviewer. Be as detailed as possible when answering such questions.

Sample Answer

ISS, which stands for integrated summary of safety, integrates safety information from animal, clinical pharmacology, epidemiological data, and an array of other sources. It, therefore, sums up data from several sources and focuses on analyses beyond individual studies. ISE, on the other hand, is the integrated summary of efficacies. Both are required in the safety and effectiveness submissions and must be submitted in the application. They integrate different data analyses and do not summarize them as most people would want to believe.

Give An Example Where Sas Fails To Convert Character Value To Numeric Value Automatically

Answer: Suppose value of a variable PayRate begins with a dollar sign . When SAS tries to automatically convert the values of PayRate to numeric values, the dollar sign blocks the process. The values cannot be converted to numeric values.

Therefore, it is always best to include INPUT and PUT functions in your programs when conversions occur.

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List Down The Fundamental Features Of Sas

A few key features of SAS include:

  • Business Solutions – The business analysis offered by SAS can be used by different companies as business products
  • Analytics – SAS has emerged as one of the leaders in the market of business products and services analytics.
  • Data Management and Accessibility – SAS also offers the benefits of DBMS software.
  • Data Reporting and Graphics – SAS enables users to present data in the form of lists, summaries, and graphic reports.
  • Visualization – Users are allowed to visualize reports in the form of multiple graphs, including but not limited to common bar charts and scatter plots to multi-page classification panels.

How Can You Include Comments In A Macro Definition

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Your interviewer may also want to know if you can execute different functions. In your answer, you can explain the process of including comments in macro. You can further elaborate your answer by explaining the multiple ways to do so.

Example:âThere are two methods of including macro definition comments. The first makes use of the %* comment statement. This can comment out all the program from the %* to the following semicolon. The second method is using the %NRSTR function. This can comment out the entire program from the first instance to the next mentioned instance.’

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How Can You Use Macro Variables In Sas

You can use macro variables as tools in SAS. They can help you dynamically change the text through symbolic substitution. In your answer, you can explain the different ways to perform symbolic substitution in a SAS program.

Example:âAfter you create a macro variable, you can use the variable by referencing to it as & variable-name. Remember to add an ampersand before the name of the variable. This macro variable reference can perform a symbolic substitution when it resolves to its value.’

Sas Developer Interview Questions And Answer

Please consider the following question very seriously because I have given plenty of Interview for SAS Developer and often interviewer asked me these following question.

1) What are the SAS functions you have used?

2) In which case you go for libname and in which case you go for proc SQL pass-through facilit diff?

3) Suppose I have a dataset with variables empid and doj then how to calculate retirement age?

4) Difference between proc sql merge and join?

5) Difference between where and if statement in SAS?

6) What data step statements you have used in your project?

7) How many tiers in SAS architecture?

8)If I have a million observations, I want to read 1 and last observation, how can we do?

9) What is %sysfunc?

10) How many ways to create a macro?

11) What macro functions you have used?

12) Difference between %str and %nrstr? In how many ways you can schedule a job?

13) How many methods are available in SAS to eliminate duplicates?

14) I have 2 datsets:ds 1 ds2

ds1:

I want inner join how many records using match-merge and SQL join will be there in resultant data set?

15) How many ways to import text file into SAS using data step?

16) Why call symput?

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Distinguish Between Sas Stata And Spss

Each package offers its own unique strengths and weaknesses. As a whole, SAS, Stata, and SPSS form a set of tools that can be used for a wide variety of statistical analyses. With Stat/Transfer, it is very easy to convert data files from one package to another in just a matter of seconds or minutes.

Therefore, there can be quite an advantage switching from one analysis package to another depending on the nature of our problem. For example, if we are performing analysis using mixed models, we might choose SAS, but if we are doing logistic regression we might choose Stata. Moreover, if we are doing an analysis of variance, then we might choose SPSS.

If we are frequently performing statistical analysis, it is strongly recommended to consider making each one of these packages part of our toolkit for data analysis.

How Do You Maintain Code Quality Standards In Your Work

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SAS roles require you to understand and write code, and employers want to ensure you can complete a high standard of work. Interviewers look for candidates who know the basics of proper coding syntax. Try to use this question to explain your plan for upholding coding conventions when executing operations in SAS.

Example: There are several steps I use to maintain the integrity of my coding. First, I always consult with any internal standards before starting a coding project. This is essential for making sure the code I develop can integrate effectively with other codes within the organization. Next, I take regular breaks to proofread my code and identify any typos or other small errors that may cause problems.

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What Strategies Do You Use To Improve Your Sas Skills

SAS roles require an extensive amount of problem-solving and troubleshooting, so employers may seek job applicants who show growth potential. When describing your ability to grow your SAS capabilities, try to focus on how you’ve learned new SAS features to solve problems in other professional environments.

Example: Staying current on the latest developments with SAS is important as an analyst. In addition to following online publications, I’m a member of several groups on social media sites for other SAS professionals. This notifies me when there are new developments or interesting techniques I can apply in my work.

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What Do You Mean By Functions And Procedures In Sas

SAS Procedures: They process data in SAS data sets to create statistics, tables, reports, charts, and plots, as well as to perform other analyses and operations on the data. All types of statistical analysis can be performed using SAS procedures. Execution of a procedure is triggered by the keyword PROC, which starts the step. Here are some SAS PROCs:

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Q21 What Is The Difference Between Reading Data From An External File And Reading Data From An Existing Dataset

The main difference is that while reading an existing data set with the SET statement, SAS retains the values of the variables from one observation to the next. Whereas when reading the data from an external file, only the observations are read. The variables will have to re-declared if they need to be used.

What Are The Basic Elements Of Sas Macro

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As macro has wide applications and usability in SAS, it is essential to know its different components. In your answer, you can list the basic elements of SAS macro.

Example:’The primary elements of a SAS macro definition include the macro name, body and parameters. The macro name calls the macro and then the parameters can pass into the macro. The system executes the macro body code when calling the SAS macro function.’

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Can One Use Proc Compare To Validate Listings

This is a follow-up question. These usually are asked based on your previous response. It would be best to convince the interviewer that you understand the concept discussed in your previous response. This will also reveal your level of expertise.

Sample Answer

Yes. It is impossible to check pages manually where the entries contain many listings. PROC COMPARE will help you in such a case.

What Is The Significance Of The Date Jan 1 1960 In Sas

This beginner-level question helps employers identify which candidates know the basics of the SAS system. Employers ask this question to determine whether candidates understand database date values in general and for SAS. When answering this question, consider discussing the general meaning of the date and how it impacts SAS operations.

Example: “In SAS, all dates count backward or forward to midnight on Jan. 1, 1960. This is the relative point in time that anchors all values in a database, which simplifies calculations for statistical analysis. All dates after Jan. 1, 1960, have positive values, while all dates before it have negative values.”

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What Are The Differences Between Proc Means And Proc Summary

Answer: PROC MEANS produces subgroup statistics only when a BY statement is used and the input data has been previously sorted by the BY variables.

PROC SUMMARY automatically produces statistics for all subgroups, giving you all the information in one run that you would get by repeatedly sorting a data set by the variables that define each subgroup and running PROC MEANS. PROC SUMMARY does not produce any information in your output. So you will need to use the OUTPUT statement to create a new DATA SET and use PROC PRINT to see the computed statistics.

What Do You Understand By Sas Documentation

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You should expect lots of questions testing your understanding of different concepts in Clinical SAS interviews. The best approach when answering such questions is to offer as much information as possible, which will convince the interviewer that you have a great understanding of what the question needs. In this case, explain to the interviewer what SAS documentation means.

Sample Answer

SAS documentation refers to anything typed in the program to make it easily readable and understandable. It, therefore, consists of the programmer header, titles, footnotes, comments, among many other things.

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How Can Transport Files Be Created In The Sas Approach

This can be done with the help of Proc Copy under the FDA submissions. The users can access up to 5 files at a time and can export the basic files to the transport domain. They can then be converted into the prime domain easily.

The labels assigned should not be longer than 40 bytes and the limit on the character variable is 200 bytes. Upon violation of this limit, the users cannot get the desired results.

Could You Clarify The Distinction Between Proc Means And Summary

When a BY statement is used and the input data has already been thoroughly sorted out using BY variables, a subgroup statistician is produced under the PROC MEANS.

There is a statistics that is automatically generated under the PROC SUMMARY for each subgroup. It offers a wide range of running information. The data set would undergo the best sorting, which is then constructed with the aid of factors that substantially define each subgroup and execute PROC MEANS.

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How Sas Is Useful According To You

IT is basically a software package that contains all the information on some relevant key procedures, protocols, and Information Technology tools that can be utilized for the accomplishment of various tasks that needs time-saving. It provides useful information on the statistical methods as well as on the objectives.

There are features and options which are good enough to be considered for the purpose of generating the Clinical Study Report including the relevant figures, summary, as well as subject listing of the concerned protocols.

There are also documents that define program variables that are useful in statistical studies.

What Are The Benefits Of Using Sas For Medical And Clinical Applications

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Well understanding everything about the core clinical applications is almost difficult. The SAS has been provided with some dynamic features which are dedicated to handling complex tasks in this domain. The following are some of the key advantages.

  • This tool is quite efficient in performing its tasks
  • All the information about the patients, medicines, and important sections can be accessed and managed under one go
  • It is useful in medicine prescription and management of the same

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What Does Sas Macro Mean

Your interviewer may start by asking you a standard question to test your basic knowledge. You can start by including a brief definition in your answer. Then, you can further elaborate on the uses of macro, its applications and its role in programming.

Example:’SAS macro is a Statistical Analysis Software feature. It is code that you can reuse to avoid manually entering repetitive codes. Macros can help automate repetition in tasks and in the creation of new functions in SAS for system programs.’

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