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08-18-2010 10:21 AM

Is there a function that will generate a random number *with decimal places* within a certain range?

For example, I need to generate a random number between -12.345 and 67.890. This number must have 3 decimal places, and can be positive or negative, as long as it's within the range given.

Much obliged! :-)

Suzy

For example, I need to generate a random number between -12.345 and 67.890. This number must have 3 decimal places, and can be positive or negative, as long as it's within the range given.

Much obliged! :-)

Suzy

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Posted in reply to deleted_user

08-18-2010 10:44 AM

Something like this would work.

var=round(ranuni(0)*(12.345+67.890),0.001)-12.345;

To generalize it you would need to create a macro or use proc fcmp.

var=round(ranuni(0)*(12.345+67.890),0.001)-12.345;

To generalize it you would need to create a macro or use proc fcmp.

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Posted in reply to RickM

08-18-2010 10:58 AM

Thank you, Rick, that's awesome!

Suzy

Suzy

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Posted in reply to deleted_user

08-18-2010 12:10 PM

Future reference, consider searching the SAS support http://support.sas.com/ website which has SAS-hosted product documentation and supplemental technical / conference reference material.

Scott Barry

SBBWorks, Inc.

Suggested Google advanced search argument, this topic/post:

generate random numbers site:sas.com

Scott Barry

SBBWorks, Inc.

Suggested Google advanced search argument, this topic/post:

generate random numbers site:sas.com

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Posted in reply to RickM

10-12-2011 05:04 PM

Note that this approach makes the endpoints of the range half as likely to be realized as the internal points.

Rick Wicklin's blog post looks at continuous ranges and integer ranges; here we have non-integer but discrete ranges.

RickM wrote:

Something like this would work.

var=round(ranuni(0)*(12.345+67.890),0.001)-12.345;

To generalize it you would need to create a macro or use proc fcmp.

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Posted in reply to deleted_user

10-12-2011 09:09 AM

See also my blog post, "How to generate random numbers in SAS."

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Posted in reply to Rick_SAS

09-21-2013 02:35 AM

Hi Rick! Do you a sample simulation code to generate multilevel data (nested data)? An example of this is a cluster-randomized trial (CRT) design where the treatment is implemented at the group level while the outcome is measured at the individual level?

Thanks,

Aye

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Posted in reply to ayecon0325

09-24-2013 09:24 AM

There are examples like this in my book *Simulating Data with SAS. For example, s*ee Section 7.5 and Section 11.3.