@jiltao Thank you for this! Highly appreciated! ... View more

@Ksharp This is great! Thank you so much! ... View more

@Ksharp , thank you!!! This is helpful! ... View more

Hello SteveDenham,    Okay. Thanks so  much for your suggestion! Much appreciated! I will try this as well and I will let you know if I have any questions.  ... View more

Hello Ksharp,  Thanks so much for this! I will try this and let you know whether it works. Thanks again! ... View more

Hello Ballardw,   Thanks so much for your reply. Highly appreciated. Each individual has multiple values of cigarette counts in a week. For example, someone may have 5 cigarettes in one day, then next day, 15, following day 7 etc. and the unique users all have different several timepoints. I hope that answers your question. ... View more

Hello. So sorry about that. I am  new on this platform. I was not sure whether  my question was  posted, so I posted again. Thanks for letting me know. ... View more

Hello. Thanks so much for your response. Highly appreciated. I  would like to see the trend  of amount of substance use over time for individuals and not groups. No  comparison of trends between the groups either.  The unit  of the substance amount is in ranges i.e. categorical. Is it possible to  conduct  analysis without comparing groups  in this case? Can you please clarify whether the type of analysis that  you suggested would work for that?  Thanks.  ... View more

 Hello everyone. I  would like to trend the amount of substance used over a period of time for individuals using a particular service to see whether there is  an increase in substance use over time or not. Also I would  like to know whether these  changes are associated with a cardiac problem or not.  The  amount of substance (y axis) is  in ranges, hence it is not continuous, while  the Y axis is time. Each subject has  measures at several points and these timepoints are not consistent for all the participants.  No comparison group..  The cardiac event is a dichotomous variable (Yes/No).   My questions are:  1) What type of statistical analysis would be appropriate to trend the amount of  substance used by individuals over the period of study, considering that the amount of substance use will be in ranges,  not a continuous variable.  2) What analysis can I do for the 2nd part to test whether there is an association with cardiac problem?   I have been looking for research papers that may have done  analysis  of this type but I have not found yet. Any advice? If anyone has a resource link  or  research paper link that could help, that would be helpful in addition to the responses that I get from this forum. Thanks.  ... View more