![]() ![]() Phase 3: The experimental drug or treatment is given to a large group of people (1000-3000) to see its effectiveness, monitor side effects and compare it to commonly used treatments. Phase 2: The experimental drug or treatment is given to a large group of people (100-300) to see that the drug is effective or not for that treatment. Phase 1: Test a new drug or treatment to a small group of people (20-80) to evaluate its safety. Describe the phases of clinical trials?ĪNS: These are the following four phases of the clinical trials: What is the difference between stratum and by statement in Proc Lifetest?ĪNS: We specify a BY statement with PROC LIFETEST to obtain separate analyses on observations in groups defined by the BY variables.Ĩ. Which procedure is used to create reports?ĪNS: Proc Report, proc Tabulate and Data _null_.ħ. When we compare the same result, obtained from SQL and with the Data step, PROC SQL requires less code and, more importantly it requires less time to execute the codeĦ. But SQL procedure cannot calculate all the above statistics by default, as it is the case with PROC MEANS.ĪNS: The SQL procedure supports almost all the functions available in the DATA step for the creation of data as well as the manipulation of the data. How to generate statistics using Proc SQl?ĪNS: Yes, we can generate the statistics like N, Mean, Median, Max, Min, STD & SUM using PROC SQL. ODS creates the outputs in html, pdf and rtf formats.Ĥ. With the help of a %INCLUDE statement the stored macros in the macro library can be automatically called.ĪNS: ODS (Output Delivery System) normally used to make the output from the Tables, Listings and graphs looks pretty. ![]() ![]() These are very are necessary in controlling and managing the macros. Clinical SAS Programmer Interview Question and AnswersĪNS: Macro libraries are the libraries, which stores all the macros required for developing TLG’s of the clinical trial. ![]()
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