Time Series vs. Repeated Measures Time series: units/cases are time units--e.g., days, months, for one?entity like a nation, state, alliance, person, whatever. Think of an?excel spreadsheet where the rows are temporal units and the columns are?attributes of temporal units.?? Repeated measures: units/cases are cross-sectional entitites (person,?nation, state, alliance, etc.), but data are collected multiple times, so?columns include Y at time 1, Y at time 2, etcetera (plus X at time 1, X at?time 2, etcetera--for X's that change over time). With cross-sectional?data, by contrast, data are collected at just one time point (one field?period). With time-series data, by contrast, there are not multiple?cross-sectional units (instead, just one nation, one person, one state,?one alliance, one whatever).
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