Programming the statistical procedures from SAS

Dataset simulation with missing data

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Contributor
Posts: 57

Dataset simulation with missing data

Dear all,

How do you simulate datasets (longitudinal data) with missing values?

Thanking you in advance for your help,

Best,

Super User
Posts: 20,730

Re: Dataset simulation with missing data

Depending on how you're simulating wouldn't you just be picking 'people' for the study from your data.  I think this is a jackknife simulation.

I'd take a sample of the data I had, with repetition, if applicable and go from there. Your real data has missing values so there shouldn't be an issue.

Regular Learner
Posts: 1

Re: Dataset simulation with missing data

Hi Reeza,

 

I wonder if you have any information on how to simulate missing periodic (i.e. longitudinal data) in SAS. I have daily data collected from sensors and I would like to simulate scenarios when sensors are down for a long period of time (i.e. 5-15 days). Any suggestions?

 

Thanks. 

 

Mohamed

SAS Super FREQ
Posts: 3,839

Re: Dataset simulation with missing data

I think you need to provide more information. What is the mechanism for generating missing values? Is there a pattern of missing values that you are trying to simulate (see http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_mi_sect018.h...)? For example, missing completely at random?  Because you stated "longitudinal data," do the missing values representing censored observations?

Contributor
Posts: 57

Re: Dataset simulation with missing data

Thanks a lot for you answers Reeza and Rick!

I am interested in different scenarii for generating missing values, including the three ones described in the link you provided Rick.

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