Power calculation in cohort study

emma19901 — Mon, 12 Feb 2018 03:44:31 GMT

Hi, I am trying to calculate power for a hypothetical cohort study, I have run in multiple times this code but I still receive the same error 180-322.

Thanks in advance!

groupweights=(1 9)/*Divide ntotal 9 to 1 between the groups => n2=9*n1, where n1 = exposed sample size & n2 = unexposed sample size*/
ntotal=120000 /*120,000 total participants in the study*/
power=.; /*Calculate power*/

OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK;

73 proc groupweights=(1|9)/*Divide ntotal 9 to 1 between the groups => n2=9*n1, where n1 = exposed sample size & n2 =

73 ! unexposed sample size*/

ERROR: Procedure GROUPWEIGHTS not found.

74 ntotal=120000 /*120,000 total participants in the study*/

75 power=.; /*Calculate power*/

77 OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK;

Re: Power calculation in cohort study

Reeza — Mon, 12 Feb 2018 03:55:30 GMT

WHere's the rest of the code? The PROC POWER statement for starters?

73 proc groupweights=

And the rest of that code doesn't look close to correct.

See the documentation reference here:

http://documentation.sas.com/?docsetId=statug&docsetTarget=statug_power_toc.htm&docsetVersion=14.3&locale=en

See the examples section for various full examples.

@emma19901 wrote:

Hi, I am trying to calculate power for a hypothetical cohort study, I have run in multiple times this code but I still receive the same error 180-322.

Thanks in advance!

groupweights=(1 9)/*Divide ntotal 9 to 1 between the groups => n2=9*n1, where n1 = exposed sample size & n2 = unexposed sample size*/
ntotal=120000 /*120,000 total participants in the study*/
power=.; /*Calculate power*/

OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK;

72

73 proc groupweights=(1|9)/*Divide ntotal 9 to 1 between the groups => n2=9*n1, where n1 = exposed sample size & n2 =

73 ! unexposed sample size*/

ERROR: Procedure GROUPWEIGHTS not found.

74 ntotal=120000 /*120,000 total participants in the study*/

75 power=.; /*Calculate power*/

76

77 OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK;

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Power calculation in cohort study

Re: Power calculation in cohort study