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NESUG 2011 Publication

https://lexjansen.com/nesug/nesug11/ph/ph08.pdf

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SAS interview questions: Macros

- September 02, 2008

SAS Macros Interview Questions and Answers SAS Macros Interview Questions and Answers This document provides a collection of interview questions and answers related to SAS Macros, which are a powerful feature in SAS for automating repetitive tasks and dynamically generating code. 1. What is a macro in SAS? A macro in SAS is a code that generates SAS statements dynamically. Macros allow for automation, reusability, and parameterization of code, making it more flexible and efficient. 2. How do you create a simple macro in SAS? You can create a macro in SAS using the %MACRO and %MEND statements. Here's an example: %macro simple_macro; data new_data; set old_data; /* Your SAS code here */ run; %mend simple_macro; %simple_macro; 3. What is the difference between a macro variable and a data step variable? Macro variables are defined and used in the macro language (outside of the DATA step) ...

You can get the SAS Code back even If you haven’t saved it

- December 16, 2009

If you happen to be one of the unlucky programmers who lost the SAS code … because you didn’t save it. There is solution for that…. SAS System automatically takes the backup of the SAS code for every 10 minutes (default); Just look in the following location: C:\Documents and Settings\Programmer Name\Application Data\SAS\EnhancedEditor\ Note: Replace “ Programmer Name ” with your login user id of the System you are using; If you go the specified location above, you will see a copy of the unsaved version of the SAS code. It will be quick if you search files with the extension name ‘.$AS’ (extension for auto-saved SAS codes) If you want, you can also change the 10-minute time interval for Auto save…. Go to… Tools ► Options ► Preferences ► Edit. In the preferences dialog box, make sure to the change the time under Autosave every …. And click on OK ...

SAS Clinical Interview QUESTIONS and ANSWERS

- November 03, 2008

SAS Clinical Interview Questions and Answers SAS Clinical Interview Questions and Answers Here is a list of common SAS clinical interview questions along with example answers and explanations to help you prepare for your next interview. 1. What is SAS? SAS stands for Statistical Analysis System. It is a software suite used for advanced analytics, business intelligence, data management, and predictive analytics. It is widely used in clinical trials for analyzing clinical data. 2. What are the phases of clinical trials? The phases of clinical trials include: Phase I: Tests safety and dosage with a small group of healthy volunteers. Phase II: Tests efficacy and side effects with a larger group of patients. Phase III: Confirms effectiveness, monitors side effects, and compares with other treatments in larger patient groups. Phase IV: Conducts post-marketing studies to gather additional inf...

SAS Interview Questions and Answers:Part1 (Behavioral Type Interview Questions)

- August 18, 2008

Part 1: Behavioral Type Interview Questions 1.Tell me about yourself? sample answer: I have been working in the Pharmaceutical industry for the past 4.5 years. My most recent experience has been with CRO, where I’ve worked for the last 2 years. I enjoy my job because it’s challenging and I like interacting with a variety of people. In my most recent assignment I was on a project called “Trial of everolimus in combination with Erlotinib in patients with metastatic cancer”. I made a significant contribution to the project because of my expertise in SAS Programming. One of my strengths is my attention to detail. I am known for being extremely thorough and meeting or exceeding deadlines and goals. My boss knows that I work well under minimal supervision, that I am very conscientious and that the job will be done right the first time. I’m looking for a new opportunity where I can contribute to the growth of the company by helping educate customers on the benefits of using our consulting ser...

Developing the DC (Demographics as Collected) SDTM Domain

- September 01, 2024

Developing the DC (Demographics as Collected) SDTM Domain Developing the DC (Demographics as Collected) SDTM Domain: Tips, Techniques, Challenges, and Best Practices Introduction The DC (Demographics as Collected) domain is a specialized SDTM (Study Data Tabulation Model) domain designed to capture demographic data as it was originally collected in clinical trials. This domain is particularly valuable in studies that involve multiple screenings or re-enrollments, where maintaining the integrity of the collected data is crucial. Unlike the DM (Demographics) domain, which provides a standardized summary of demographic data, the DC domain preserves the raw, unstandardized data, ensuring accurate data representation. This article delves into the key aspects of developing the DC domain, including the challenges, best practices, and the critical differences between the DC and DM domains. We also integrate insights from industry pa...

SDTM Programming Interview Questions and Answers

- August 31, 2024

SDTM Programming Interview Questions and Answers 1. What is SDTM, and why is it important in clinical trials? Answer: SDTM (Study Data Tabulation Model) is a standardized format for organizing and submitting clinical trial data to regulatory authorities, such as the FDA. It is important because it ensures that data is structured consistently across studies, facilitating data review, analysis, and submission. 2. What are the key components of an SDTM dataset? Answer: The key components of an SDTM dataset include: Domains: Specific datasets like DM (Demographics), AE (Adverse Events), LB (Laboratory), etc. Variables: Each domain has standard variables such as USUBJID (Unique Subject Identifier), DOMAIN, VISIT, and others. Value-Level Metadata: Defines the structure and content of the variables. Controlled Terminology: Standard terms and codes used in SDTM datasets. 3. What is the purpose of the DM (Demographics) domain in SDTM? Answer: The DM domain in SDTM provi...

SAS Interview Questions and Answers: CDISC, SDTM and ADAM etc

- September 23, 2008

1) What do you know about CDISC and its standards? CDISC stands for Clinical Data Interchange Standards Consortium and it is developed keeping in mind to bring great deal of efficiency in the entire drug development process. CDISC brings efficiency to the entire drug development process by improving the data quality and speed-up the whole drug development process and to do that CDISC developed a series of standards, which include Operation data Model (ODM), Study data Tabulation Model (SDTM) and the Analysis Data Model ADaM ). 2) Why people these days are more talking about CDSIC and what advantages it brings to the Pharmaceutical Industry? A) Generally speaking, Only about 30% of programming time is used to generate statistical results with SAS®, and the rest of programming time is used to familiarize data structure, check data accuracy, and tabulate/list raw data and statistical results into certain formats. This non-statistical programming time will be significantly reduced...

Resolving the SAS EG Transcoding Error

- November 19, 2024

Resolving the SAS EG Transcoding Error Addressing the "Character Data Lost During Transcoding" Issue in SAS EG Author: Sarath Date: November 19, 2024 Introduction While working in SAS Enterprise Guide (SAS EG), you may encounter the error: "Some character data was lost during transcoding in the dataset." This issue typically arises when character data contains unsupported characters or is truncated due to insufficient column lengths. In this blog post, we'll explore the root causes and provide step-by-step solutions. Common Causes Unsupported Characters: The data contains special or non-ASCII characters not representable in the session encoding. Truncation: Character variables are too short to store the full data, leading to loss of information. ...

Common P21 SDTM Compliance Issues and How to Resolve Them

- December 06, 2024

Common P21 SDTM Compliance Issues and How to Resolve Them Common P21 SDTM Compliance Issues and How to Resolve Them By Sarath Annapareddy Introduction Pinnacle 21 (P21) is a cornerstone for validating SDTM datasets against CDISC standards. Its checks ensure compliance with regulatory requirements set by the FDA, PMDA, and other authorities. However, resolving the issues flagged by P21 can be challenging, especially for beginners. This post dives into common P21 compliance issues and provides actionable solutions with examples. 1. Missing or Invalid Controlled Terminology Issue: P21 flags variables like LBTESTCD or SEX as non-compliant with CDISC Controlled Terminology (CT). This happens when values in your datasets are o...

ERROR: The format XXXX was not found or could not be loaded.

- February 07, 2010

Whenever you try to open a SAS data set which has permanent formats, you will get the error message in the log file saying “ERROR: The format XXXX was not found or could not be loaded.” This happens generally when you don't have the format library where the SAS dataset located. What happens here is, SAS will not permit you to open the data set without the format library. But, if you use options nofmterr; at the top of your program, SAS will opens the dataset for you despite the fact that it does not have the format library. SAS doesn't treat missing format or informat as an error when the options nofmterr; statement used. The FMTERR\NOFMTERR option determines whether or not SAS generates an error message when a variable's format cannot be found. ( source: support.sas.com) The caveat here is, you will not be able to see the formatted values for your variables, but you will be able to open or use the dataset. OPTIONS nofmterr; *you will not be able to see th...