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- The "conns" argument is to create a name for a DSConnection-class object, which will be used by statistical commands to refer to particular studies.
- The "symbol" argument is to create a name by which to refer to the dataframes in each study. Here we have opted for "DST" , an initialism for "DataSHIELD Table"
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(you may have seen "D" for "Dataframe" being used historically, but we are now phasing this out as it sometimes causes problems with another function called "D") |
- the "table" argument is to specify the names of the tables you wish to connect to as they appear on the server servers you are onusing. The structure, "AAAA.BBBB", "AAAA.CCCC" means that within project AAAA there are tables BBBB and CCCC which we connect to both of, by listing them in an R vector.
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If we do not specify individual variables to assign to the server-side R session, all variables held in the Opal servers are assigned. Assigned data are kept in a data frame named DST by convention. Each column of that data frame represents one variable and the rows are the individual records. |
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