How to calculate new variable with arithmetic formula and if then command

[mehul4frnds]

Hello to all,

I am trying to calculate a new variable with the arithmetic equation.  Here I want  a new variable (LDL_new) should be calculated only if as Ttg is less than 4.5

My data looks like this:

data have1;
input id name$ gen$ PROCHI DATE TC HDL LDL Ttg;
datalines;
1 ram male 1 1.1 8.0 3.0 1.45 1
2 mohan male 1 1.1 8.5 2.9 1.24 1
3 shyam male 2 2.1 6.8 3.1 2.23 2
4 radha female 2 2.1 7.2 3.8 3.80 3
5 gita female 2 2.1 . 2.7 3.45 3
6 sita female 2 3.1 8.9 6.8 4.56 2
7 ranu female 3 2.1 7.5 5.9 1.83 5
8 tina female 3 2.1 3.6 2.8 1.23 8
9 shan male 4 8.1 2.8 1.1 1.67 9
;
run;

I have used this command to calculate new variable LDL_new

data want1;
set have1;
LDL_nw2 = TC - ((HDL)+(Ttg/5));
run;

I want data like this:

SAS Output                      id        name       gen        PROCHI DATE      TC       HDL     LDL      Ttg       LDL_nw

1	ram	male	1	1.1	8.0	3.0	1.45	1	4.8
2	mohan	male	1	1.1	8.5	2.9	1.24	1	5.4
3	shyam	male	2	2.1	6.8	3.1	2.23	2	3.3
4	radha	female	2	2.1	7.2	3.8	3.80	3	2.8
5	gita	female	2	2.1	.	2.7	3.45	3	.
6	sita	female	2	3.1	8.9	6.8	4.56	2	1.7
7	ranu	female	3	2.1	7.5	5.9	1.83	5
8	tina	female	3	2.1	3.6	2.8	1.23	8
9	shan	male	4	8.1	2.8	1.1	1.67	9

Kindly suggest.

Thanks in advance

[RW9 · Accepted solution]

data want1;
  set have1;
  if ttg < 4.5 then LDL_nw2 = TC - ((HDL)+(Ttg/5));
run;

[mehul4frnds]

Thanks for the reply. This works very well.

Is there any other way with using SQL also?

[RW9]

case when ttg < 4.5 then LDL_nw2 = TC - ((HDL)+(Ttg/5)) else . end asldl_nw2

[mehul4frnds]

I tried this command 

proc sql ;
create table want1
case when ttg < 4.5 then LDL_nw2 = TC - ((HDL)+(Ttg/5))
else .
from have1
end as ldl_nw2 ;
quit;

it says:

15 proc sql ;
16 create table want1 as
17 case when ttg < 4.5 then LDL_nw2 = TC - ((HDL)+(Ttg/5))
---- ----
22 76
202
ERROR 22-322: Syntax error, expecting one of the following: (, SELECT.

ERROR 76-322: Syntax error, statement will be ignored.

ERROR 202-322: The option or parameter is not recognized and will be ignored.

17 ! case when ttg < 4.5 then LDL_nw2 = TC - ((HDL)+(Ttg/5))
----
22
ERROR 22-322: Syntax error, expecting one of the following: a quoted string, !, !!, &, *, **, +,
',', -, /, <, <=, <>, =, >, >=, AND, AS, EQ, EQT, FORMAT, FROM, GE, GET, GT, GTT,
INFORMAT, INTO, LABEL, LE, LEN, LENGTH, LET, LT, LTT, NE, NET, NOT, OR, TRANSCODE,
^, ^=, |, ||, ~, ~=.

18 else .
19 from have1
20 end as ldl_nw2 ;
21 quit;
NOTE: The SAS System stopped processing this step because of errors.
NOTE: PROCEDURE SQL used (Total process time):
real time 0.06 seconds
cpu time 0.01 seconds

Kindly suggest

[RW9]

Sorry, I assumed you knew how to program using proc sql.  Perhaps read on up that?  You are missing a select and form is in the wrong place.

proc sql ;
  create table want1 as 
  select case when ttg < 4.5 then LDL_nw2 = TC - ((HDL)+(Ttg/5)) else . end as ldl_nw2
  from have1;
quit;