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The script begins by creating two datasets, 'renyi1' and 'renyi2', from integrated raw data (CARDS statement). Each dataset contains information on survival days and censorship status. A 'group' variable is then added to each dataset to identify the treatment groups (1 for chemotherapy, 2 for chemotherapy + radiotherapy). The two datasets are then combined into a single dataset, 'renyi'. A PROC PRINT is used to display the content of the combined dataset. Finally, PROC LIFETEST is executed to perform the survival analysis, comparing the survival curves of the two groups and generating graphs.

Data Analysis

Type : CREATION_INTERNE

The source data ('renyi1' and 'renyi2') are entirely created internally within the SAS script using DATA and CARDS statements. They represent survival data with an identifier, the number of survival days, and a censorship indicator.

1 Code Block

DATA STEP Data

Explanation :
This DATA STEP block creates the 'renyi1' dataset by reading embedded raw data via a CARDS statement. It contains an identifier (id), survival days (days), and a censorship indicator (censor). The '@code_sas/@TEMPLATE.sas' part in the INPUT statement appears to be a syntax error or a remnant of an intention to include additional data or variables in a non-standard way, but is ignored when reading data via CARDS.

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1	DATA renyi1;
2	DO id=1 to 45;
3	INPUT days censor @code_sas/@TEMPLATE.sas; OUTPUT;
4	END;
5	CARDS;
6	1 0 63 0 105 0 129 0 182 0 216 0 250 0 262 0 301 0 301 0 342 0 354 0
7	356 0 358 0 380 0 383 0 383 0 338 0 394 0 408 0 460 0 489 0 499 0 523 0
8	524 0 535 0 562 0 569 0 675 0 676 0 748 0 778 0 786 0 797 0 953 0 968 0
9	1000 0 1245 0 1271 0 1420 0 1551 0 1694 0 2363 0 2754 1 2950 1
10	;

2 Code Block

DATA STEP

Explanation :
This DATA STEP block modifies the existing 'renyi1' dataset by adding a new 'group' variable with a value of 1 for all records. This identifies the first treatment group (chemotherapy).

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1	DATA renyi1; SET renyi1; group=1;

3 Code Block

DATA STEP Data

Explanation :
Similar to the first block, this DATA STEP creates the 'renyi2' dataset from embedded raw data. It also contains an identifier, survival days, and a censorship indicator for the second treatment group. The same observation regarding the INPUT statement applies here.

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1	DATA renyi2;
2	DO id=1 to 45;
3	INPUT days censor @code_sas/@TEMPLATE.sas; OUTPUT;
4	END;
5	CARDS;
6	17 0 42 0 44 0 48 0 60 0 72 0 74 0 95 0 103 0 108 0 122 0 144 0
7	167 0 170 0 183 0 185 0 193 0 195 0 197 0 208 0 234 0 235 0 254 0 307 0
8	315 0 401 0 445 0 464 0 484 0 528 0 542 0 547 0 577 0 580 0 795 0 855 0
9	1366 0 1577 0 2060 0 2412 1 2486 1 2796 1 2802 1 2934 1 2988 1
10	;

4 Code Block

DATA STEP

Explanation :
This DATA STEP block adds the 'group' variable with a value of 2 to all records in the 'renyi2' dataset, thus identifying the second treatment group (chemotherapy + radiotherapy).

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1	DATA renyi2; SET renyi2; group=2;

5 Code Block

DATA STEP Data

Explanation :
This DATA STEP combines (concatenates) the 'renyi1' and 'renyi2' datasets into a new dataset called 'renyi'. This prepares the data for comparative survival analysis.

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1	DATA renyi; SET renyi1 renyi2;

6 Code Block

PROC PRINT

Explanation :
This PROC PRINT displays the content of the 'renyi' dataset in the output window, allowing for a quick verification of the combined data.

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1	PROC PRINT;

7 Code Block

PROC LIFETEST

Explanation :
This PROC LIFETEST performs the survival analysis. It uses the non-parametric LIFE method to estimate the survival function. The 'plots=(s,h)' options request the generation of survival curves and cumulative hazard function. The 'time days*censor(1)' statement specifies that 'days' is the time variable and 'censor' is the event variable, where '1' indicates an event (death). The 'strata group' statement requests a separate survival analysis for each level of the 'group' variable, allowing for a comparison between treatment groups. The SYMBOL statements customize the appearance of the curves in the graphs.

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1	PROC LIFETEST method=life DATA=renyi plots=(s,h) graphics;
2	title 'Gastrointestinal Tumor Study Group (1982)';
3	title2 'Gastric cancer survival: 1=chemotherapy vs 2=chemotherapy+radiotherapy';
4	time days*censor(1);
5	strata group;
6	symbol1 v=none color=red line=1;
7	symbol3 v=none color=black line=3;
8
9
10	RUN;

8 Code Block

MACRO DEFINITION

Explanation :
This code block defines a SAS macro named 'TEMPLATE'. It is a template for creating new macros, including sections for documentation, modification history, usage, notes, parameters, and error handling. Although present in the referenced files, this macro is not called or executed by the main SAS script; it serves only as a definition or template.

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/*===================================================================== Program Name : TEMPLATE.sas Purpose : PURPOSE OF THE MACRO SAS Version : SAS VERSION WHEN THE MACRO WAS ORIGINALLY WRITTEN Input Data : N/A Output Data : N/A Macros Called : LIST ANY UTILITY MACROS CALLED BY THIS MACRO SO THEY CAN BE ADDED TO THE SASAUTOS LIBRARY AS WELL Originally Written by : YOUR FULL NAME (NOT INITIALS - MAKE IT EASY TO FIND YOU LATER) Date : TODAYs DATE IN DDMONYYYY FORMAT (INTERNATIONLALLY UNAMBIGUOUS DATE FORMAT) Program Version # : 1.0 ======================================================================= Copyright (c) 2016 Scott Bass (sas_l_739 @yahoo.com.au) This code is licensed under the Unlicense license. For more information, please refer to http://unlicense.org/UNLICENSE. ======================================================================= Modification History : Original version Programmer : YOUR FULL NAME Date : DDMONYYYY Change/reason : SUMMARY OF CODE CHANGE. ADD COMMENTS IN THE CODE ITSELF (INCLUDING NAME AND DATE) FOR ADDITIONAL DETAILS) Program Version # : 1.1 Programmer : YOUR FULL NAME Date : DDMONYYYY Change/reason : SUMMARY OF CODE CHANGE. ADD COMMENTS IN THE CODE ITSELF (INCLUDING NAME AND DATE) FOR ADDITIONAL DETAILS) Program Version # : 1.2 VERSION 1.0 (ORIGINAL VERSION): LEAVE "Original version" TEXT IN PLACE DELETE REVISION HISTORY VERSION 1.1+ (MODIFIED VERSION): DELETE THE "Original version" TEXT ADD THE REVISION HISTORY PER ABOVE TEMPLATE =====================================================================*/ /*--------------------------------------------------------------------- Usage: LIST MACRO USE CASE / UNIT TESTS HERE TRY TO USE UNIVERSALLY AVAILABLE SOURCE DATA IF POSSIBLE (EG. SASHELP DATASETS, C:\WINDOWS, /USR/LOCAL, ETC.) OR ELSE CREATE SIMPLE TEST DATA INLINE SO THE END USER CAN RUN THE USE CASE WITHOUT FURTHER SETUP OR EFFORT. IDEALLY THE TEST CASES RUN BY HIGHLIGHTING THE TEXT IN THE SAS EDITOR AND HITTING F3 ======================================================================= ADDITIONAL USE CASE ======================================================================= ADDITIONAL USE CASE ----------------------------------------------------------------------- Notes: EXPLANATORY NOTES HERE, THAT EXPLAIN DESIGN DECISIONS OR GENERAL USAGE INFORMATION. THESE ARE NOTES THAT GO BEYOND COMMENTS WITHIN THE MACRO CODE. ---------------------------------------------------------------------*/ %macro TEMPLATE /*--------------------------------------------------------------------- PURPOSE OF THE MACRO (REDUNDANT BUT NICE TO HAVE HERE AS WELL) ---------------------------------------------------------------------*/ (PARM1 /* PARM1 EXPLANATION (REQ). */ ,PARM2=default /* PARM2 EXPLANATION (Opt). Default is "default" */ ); %local macro parmerr _data_; %let macro = &sysmacroname; %* check input parameters ; %parmv(PARM1, _req=1,_words=1,_case=N) /* words allows ds options */ %parmv(PARM2, _req=0,_words=0,_case=N) %if (&parmerr) %then %goto quit; %* additional error checking ; %if (&parm1 eq FOO and %superq(parm2) eq BAR) %then %do; %parmv(_msg=These two values are mutually exclusive) %goto %quit; %end; %* well commented macro code goes here ; %* Use %* or /* */ comment style for comments that do not show in MPRINT output ; %* Use * comment style for comments that show in MPRINT output ; %quit: %mend; /******* END OF FILE *******/

1	/*=====================================================================
2	Program Name : TEMPLATE.sas
3	Purpose : PURPOSE OF THE MACRO
4	SAS Version : SAS VERSION WHEN THE MACRO WAS ORIGINALLY WRITTEN
5	Input Data : N/A
6	Output Data : N/A
7
8	Macros Called : LIST ANY UTILITY MACROS CALLED BY THIS MACRO
9	SO THEY CAN BE ADDED TO THE SASAUTOS LIBRARY AS WELL
10
11	Originally Written by : YOUR FULL NAME (NOT INITIALS - MAKE IT EASY TO FIND YOU LATER)
12	Date : TODAYs DATE IN DDMONYYYY FORMAT (INTERNATIONLALLY UNAMBIGUOUS DATE FORMAT)
13	Program Version # : 1.0
14
15	=======================================================================
16
17	Copyright (c) 2016 Scott Bass (sas_l_739 @yahoo.com.au)
18
19	This code is licensed under the Unlicense license.
20	For more information, please refer to http://unlicense.org/UNLICENSE.
21
22	=======================================================================
23
24	Modification History : Original version
25
26	Programmer : YOUR FULL NAME
27	Date : DDMONYYYY
28	Change/reason : SUMMARY OF CODE CHANGE.
29	ADD COMMENTS IN THE CODE ITSELF
30	(INCLUDING NAME AND DATE) FOR ADDITIONAL DETAILS)
31	Program Version # : 1.1
32
33	Programmer : YOUR FULL NAME
34	Date : DDMONYYYY
35	Change/reason : SUMMARY OF CODE CHANGE.
36	ADD COMMENTS IN THE CODE ITSELF
37	(INCLUDING NAME AND DATE) FOR ADDITIONAL DETAILS)
38	Program Version # : 1.2
39
40	VERSION 1.0 (ORIGINAL VERSION):
41	LEAVE "Original version" TEXT IN PLACE
42	DELETE REVISION HISTORY
43
44	VERSION 1.1+ (MODIFIED VERSION):
45	DELETE THE "Original version" TEXT
46	ADD THE REVISION HISTORY PER ABOVE TEMPLATE
47
48	=====================================================================*/
49
50	/*---------------------------------------------------------------------
51	Usage:
52
53	LIST MACRO USE CASE / UNIT TESTS HERE
54	TRY TO USE UNIVERSALLY AVAILABLE SOURCE DATA IF POSSIBLE
55	(EG. SASHELP DATASETS, C:\WINDOWS, /USR/LOCAL, ETC.)
56	OR ELSE CREATE SIMPLE TEST DATA INLINE
57	SO THE END USER CAN RUN THE USE CASE WITHOUT FURTHER SETUP OR EFFORT.
58	IDEALLY THE TEST CASES RUN BY HIGHLIGHTING THE TEXT IN THE SAS EDITOR
59	AND HITTING F3
60
61	=======================================================================
62
63	ADDITIONAL USE CASE
64
65	=======================================================================
66
67	ADDITIONAL USE CASE
68
69	-----------------------------------------------------------------------
70	Notes:
71
72	EXPLANATORY NOTES HERE, THAT EXPLAIN DESIGN DECISIONS OR
73	GENERAL USAGE INFORMATION.
74
75	THESE ARE NOTES THAT GO BEYOND COMMENTS WITHIN THE MACRO CODE.
76
77	---------------------------------------------------------------------*/
78
79	%macro TEMPLATE
80	/*---------------------------------------------------------------------
81	PURPOSE OF THE MACRO (REDUNDANT BUT NICE TO HAVE HERE AS WELL)
82	---------------------------------------------------------------------*/
83	(PARM1 /* PARM1 EXPLANATION (REQ). */
84	,PARM2=default /* PARM2 EXPLANATION (Opt). Default is "default" */
85	);
86
87	%local macro parmerr _data_;
88	%let macro = &sysmacroname;
89
90	%* check INPUT parameters ;
91	%parmv(PARM1, _req=1,_words=1,_case=N) /* words allows ds options */
92	%parmv(PARM2, _req=0,_words=0,_case=N)
93
94	%IF (&parmerr) %THEN %goto QUIT;
95
96	%* additional error checking ;
97	%IF (&parm1 eq FOO and %superq(parm2) eq BAR) %THEN %DO;
98	%parmv(_msg=These two values are mutually exclusive)
99	%goto %QUIT;
100	%END;
101
102	%* well commented macro code goes here ;
103
104	%* Use %* or /* */ comment style for comments that DO not show in MPRINT OUTPUT ;
105	%* Use * comment style for comments that show in MPRINT OUTPUT ;
106
107	%QUIT:
108
109	%mend;
110
111	/***** END OF FILE *****/

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