Hi.    I am going to have to use the greedy matching propensity score macro.  I am not good at macros. I know Lori Parsons has published a paper.    But I am not sure how to run it. Or where to put the commands to use the macro.  I have to figure out the caliper width of 0.2 of the standard deviation of the logit in PS.     1, Can anyone help me with the codes?  For example, pretend you have observational data.     2. . How do I calculate the caliper width of 0.2 of the SD of the logit in PS?  Where can I find the SD of the logistic regression. I have done tons of logistic regressions, but I do not recall seeing a standard deviation.   3. Even though Lori Parson's paper is wonderful, I do not fully understand macros, where to put the macro call line.    4. If anyone has done this, greedy matching, could you please send me the whole code with where the macro call should be? and a separate SAS macro they used with their variables?   Thank you.    I have no data yet, so for #4, if you could include non-identified data so I can complete this, I would be most thankful.    PLEASE HELP ME!!! ... View more

I am facing a problem in formulating an efficient SAS algorithm to capture combination therapy for patients would be really appreciated if we can get some help regarding the same. The problem is defined below: We have data where a patient has evidence of having taken 4 different drug classes in a specified period. (Each column is the start and end date of only 1 drug class.) (We have built episodes spanning the duration for which each drug class was taken by the patient.) They are given in the form of epi_start1 and epi_end1 (that is the start and end of drug class 1) and 3 more such pairs of start and end dates for drug classes 2, 3 and 4 respectively. A patient is classified as taking quadruple therapy if all 4 drugs were taken together for at least 14 days. / But if a patient has overlapping days of supply of at least 14 days between 3 out of the 4 drugs then the patient is classified as taking triple therapy of the three overlapping drug classes only if the 4th drug class is not starting later than the triple therapy combination. If the 4th drug is starting later then it is classified as monotherapy of drug 4. Similarly, if there is an overlap of at least 14 days between 2 of the 4 drugs then it is a dual therapy of those two drugs only if the third or fourth does not lie after the start of the dual therapy. Else it is monotherapy of latest drug. Moreover, if the patient takes two different sets of dual therapy in this period (i.e., together for at least 14 days but not simultaneously) then the patient must be classified as taking the later dual therapy. The sample data set and illustration of the same is attached herewith for your reference. This dataset does not have actual patient IDs. I only included 25 patients for help.   One of the documents attached is a pictoral of the timing and details.   Please help me.  ... View more