Interrupted time series

Interrupted time series analysis (ITS), sometimes known as quasi-experimental time series analysis, is a method of statistical analysis involving tracking a long-term period before and after a point of intervention to assess the intervention's effects. The time series refers to the data over the period, while the interruption is the intervention, which is a controlled external influence or set of influences.[1][2] Effects of the intervention are evaluated by changes in the level and slope of the time series and statistical significance of the intervention parameters.[3] Interrupted time series design is the design of experiments based on the interrupted time series approach.

The method is used in various areas of research, such as:

political science: impact of changes in laws on the behavior of people;[2] see, e.g., Effectiveness of sex offender registration policies in the United States#Interrupted time series analysis studies.
economics: impact of changes in credit controls on borrowing behavior[2]
sociology: impact of experiments in income maintenance on the behavior of participants in welfare programs[2]
history: impact of major historical events on the behavior of those affected by the events[2]
medicine: in medical research, medical treatment is an intervention whose effect are to be studied
marketing research: to analyze the effect of "designed market interventions" (e.g., advertising) on sales.[4]

The ITS design is the base of the comparative time series design, whereby there is a control series and an interrupted series, and the effect of an intervention is confirmed by the control series.[5]

References

Ferron, John; Rendina‐Gobioff, Gianna (2005), "Interrupted Time Series Design", Encyclopedia of Statistics in Behavioral Science, American Cancer Society, doi:10.1002/0470013192.bsa312, ISBN 978-0-470-01319-9, retrieved 2020-03-09
McDowall, David; McCleary, Richard; McCleary, Professor of Criminology Law & Society and Planning Policy & Design Richard; Meidinger, Errol; Jr, Richard A. Hay (August 1980). Interrupted Time Series Analysis. SAGE. pp. 5–6. ISBN 978-0-8039-1493-3.
Handbook of Psychology, Research Methods in Psychology, p. 582
Brodersen; et al. (2015). "Inferring causal impact using Bayesian structural time-series models". Annals of Applied Statistics. 9: 247–274. Retrieved 21 March 2019.
The Design and Analysis of Research Studies, p. 168

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[1] Ferron, John; Rendina‐Gobioff, Gianna (2005), "Interrupted Time Series Design", Encyclopedia of Statistics in Behavioral Science, American Cancer Society, doi:10.1002/0470013192.bsa312, ISBN 978-0-470-01319-9, retrieved 2020-03-09

[its1-2] McDowall, David; McCleary, Richard; McCleary, Professor of Criminology Law & Society and Planning Policy & Design Richard; Meidinger, Errol; Jr, Richard A. Hay (August 1980). Interrupted Time Series Analysis. SAGE. pp. 5–6. ISBN 978-0-8039-1493-3.

[3] Handbook of Psychology, Research Methods in Psychology, p. 582

[4] Brodersen; et al. (2015). "Inferring causal impact using Bayesian structural time-series models". Annals of Applied Statistics. 9: 247–274. Retrieved 21 March 2019.

[5] The Design and Analysis of Research Studies, p. 168

Interrupted time series

See also

References