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Group Time Series Design

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In a Group Time Series design
a) The subjects act as their own control.
b) We can study situations where records are kept over time.
c) Has the internal validity problem of "history".
d) All are true

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https://brainmass.com/statistics/time-series-analysis/group-time-series-design-32321

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a) In a (single) group time series design: O X O O X O O X O.
Here there ...

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In a Group Time Series design
a) The subjects act as their own control.
b) We can study situations where records are kept over time.
c) Has the internal validity problem of "history".
d) All are true

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