Conditional statements in sas
- 2. Types of conditional statements in SAS: 1) WHERE a) where “condition”; = where 2) IF a) if “condition” then “statement”; = if -- then b) if “condition” then “statement”; else “statement”; = if – then – else c) if “condition” then “statement”; else if “statement”; = if – then – else -- if 3) DO a) if “condition” then do; “statement”; end; = if – then – do b) do while “condition”; “statement”; end; = do while c) do until “condition” ; “statement”; end; = do until d) do “var” = “start” to “end”; “statement”; end; = do loop e) do “var” = “start” to “end” by “inc”; “statement”; end; = do loop f) do over “array”; “statement”; end; = do loop
- 3. WHERE conditional statement in SAS: 1) WHERE a) where “condition”; = where It is used to select observations that meet a particular condition in a dataset The conditions in where statement can be numeric or character expression You can use only one where statement in a data step or in a proc step Examples:- /* Selecting observations in a data step */ data dm1; set derived.dm; where . < 18 <= age <= 55 and gender=“M”; run; /* Selecting observations for processing in a proc step */ proc means data=derived.dm; where . < age <= 55 and gender=“F”; run; http://support.sas.com/documentation/cdl/en/lrdict/61724/HTML/default/a000202951.htm
- 4. IF conditional statement in SAS: 2) IF a) if “condition” then “statement”; = if -- then b) if “condition” then “statement”; else “statement”; = if – then – else c) if “condition” then “statement”; else if “statement”; = if – then – else – if Processes only those observations that meet the condition The conditions in if statement can be numeric or character expression You can use more than one if statement in a data step Example:- data dm1; set dm; if citycode=5564 then city=„Mumbai‟ = if -- then if . < age <= 25 then young=„Yes‟; = if – then – else else young=„No‟; if 18 <= age <= 25 then agegrp=‟18 – 25 years‟; = if – then – else – if else if 26 <= age <= 35 then agegrp=„26 – 35 years‟; else if 36 <= age <= 45 then agegrp=„36 – 45 years‟; else agegrp=„> 46 years‟; run; http://support.sas.com/documentation/cdl/en/lrdict/61724/HTML/default/a000201978.htm http://support.sas.com/documentation/cdl/en/lrdict/61724/HTML/default/a000202239.htm
- 5. DO conditional statement in SAS: 3) DO a) if “condition” then do; “statement”; end; = if – then – do b) do while “condition”; “statement”; end; = do while c) do until “condition” ; “statement”; end; = do until d) do “var” = “start” to “end”; “statement”; end; = do loop e) do “var” = “start” to “end” by “inc”; “statement”; end; = do loop f) do over “array”; “statement”; end; = do loop
- 6. DO conditional statement in SAS: 1) DO The do statement is valid in a data step It specifies a group of statements to be executed as a unit Every do loop has a corresponding end statement The statements between the do and end statements are called a DO group You can nest do statements within do groups A simple do statement is often used within if – then – else statements to designate a group of statements to be executed depending on whether the if condition is true or false do until statement executes statements in a do loop repetitively until a condition is true, checking the condition after each iteration of the do loop do while statement executes statements in a do loop repetitively while a condition is true, checking the condition before each iteration of the do loop The do until statement evaluates the condition at the bottom of the loop The do while statement evaluates the condition at the top of the loop do over loop used to perform the operations in the do loop over ALL elements in the array Within a single do loop multiple arrays can be referenced and operations on different arrays can be performed
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