![]() In the first line, PROC FREQ tells SAS to execute the FREQ procedure on the dataset given in the DATA= argument. * Alternately, if you will be using any of the analysis options produced by the TABLES statement: The basic syntax of the FREQ procedure is: PROC FREQ DATA=dataset The FREQ procedure can work with both string (character) or numeric categorical variables. This is the default option for YRDIF.The FREQ procedure prints all values of a given categorical variable in the Output window, along with the counts and proportions. Specifies that a person's age will be computed. Uses the actual number of days in a particular month, and 365 days as the number of days in a year (regardless of the actual number of days in a given year.) Uses the actual number of days in a particular month, and 360 days as the number of days in a year (regardless of the actual number of days in a given year.) Uses the actual number of days or years between dates. Specifies a 30 day month and a 360 day year, regardless of the actual number of calendar days in a given month or year. ![]() In SAS 9.3, there are five possible options that can be used, which are indicated by the following character strings: Table 2: Valid character strings for basis argument in DATDIF and YRDIF functions. Specifically, it determines the number of days that should be used to characterize the period of time in a month or year. The basis argument determines how the date arithmetic is carried out. Note that the DATDIF and YRDIF functions require a special argument basis argument. YRDIF - Given two SAS dates or datetimes, computes the difference between the dates in years.DATDIF - Given two SAS dates or datetimes, computes the difference between the dates in days.MDY - Given numbers or variables representing the month, day, and year, creates a new date variable.ĭate computation (or "date difference") functions carry out arithmetic operations on dates for example, computing the elapsed time between two dates.WEEKDAY - Given a number or a variable representing a date or datetime, returns the day of the week (as a coded number from 1-7).ĭate creation functions construct new date or datetime variables based on their inputs.DAY - Given a number or a variable representing a date or datetime, returns the day (as a number from 1-31).MONTH - Given a number or a variable representing a date or datetime, returns the month.QTR - Given a number or a variable representing a date or datetime, returns the quarter.YEAR - Given a number or a variable representing a date or datetime, returns the year.In this tutorial, we show how to compute new variables from dates and times using two major types of date functions: extraction-type functions and computation-type functions.ĭate extraction functions are used to extract a portion of a date from a date variable. (For a full listing of date-time formats, see About SAS Date, Time, and Datetime Values.) ![]() However, dates can be displayed using any chosen format by setting the format in a data step or proc step. Dateīy default, SAS date and time variables are printed using the SAS internal values, rather than a "human-readable" date format. Table 1: SAS internal values for selected dates. Dates after January 1, 1960, are stored as positive numbers dates before January 1, 1960, are stored as negative numbers. SAS date values are the stored internally as the number of days between January 1, 1960, and a specified date.SAS datetime values stored internally as the number of seconds between midnight, January 1, 1960, and the specified date and time.SAS time values are stored internally as the number of seconds between midnight of the current day and another time value.This helps to simplify the computations when computing the differences between dates. Regardless of how the researcher records dates or times in their dataset, SAS "internally" records datetime variables as integers. In SAS, dates and times are considered numeric variables, but they have several special properties to be aware of. Before reading this tutorial, you may wish to review SAS Date Formats and Informats and SAS Date, Time, and Datetime Values.ĭates, times, and date-times are commonly used variable types in research.
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