I generated cohortData following single study’s step. I don’t know how to manupulate this data set, what type of data are they? for instance if I want to add propensity score covariate to each individual, how can I add this column to dataset. The dataset are not matrix, nor data.frame. Can any one help? Thanks.
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A cohort is a group of people who share a common characteristic or experience within a defined period (e.g., are born, are exposed to a drug or vaccine or pollutant, or undergo a certain medical procedure). Thus a group of people who were born on a day or in a particular period, say 1948, form a birth cohort. The comparison group may be the general population from which the cohort is drawn, or it may be another cohort of persons thought to have had little or no exposure to the substance under investigation, but otherwise similar. Alternatively, subgroups within the cohort may be compared with each other.
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