That step is easy, but context is hard. You really need to provide a 
reproducible example. There are many models, many analysis tools,  and many 
timescales to choose from. In fact, this could easily be mistaken for a 
question about statistics (not really on-topic here) since you have failed to 
indicate what any of your constraints or decisions in those areas are. 

It may be as simple as you not knowing about date or POSIXt arithmetic  (see 
?DateTimeClasses).
-- 
Sent from my phone. Please excuse my brevity.

On September 6, 2016 6:08:41 AM PDT, Tahereh Dehdarirad <tdehd...@gmail.com> 
wrote:
>Hi,
>
>Is it possible to use time as an offset (exposure variable) in factor
>analysis? If yes, would you please advise how?
>
>
>Thanks,
>
>Tahereh
>
>
>
>
>Tahereh Dehdarirad
>PhD Student of Library and Information Science
>University of Barcelona, Spain
>
>       [[alternative HTML version deleted]]
>
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