English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We develop new methods for changes-in-changes and distributional syntheticcontrols when there exists group level heterogeneity. For changes-in-changes,we allow individuals to belong to a large number of heterogeneous groups. Thenew method extends the changes-in-changes method in Athey and Imbens (2006) byfinding appropriate subgroups within the control groups which share similargroup level unobserved characteristics to the treatment groups. Fordistributional synthetic control, we show that the appropriate syntheticcontrol needs to be constructed using units in potentially different timeperiods in which they have comparable group level heterogeneity to thetreatment group, instead of units that are only in the same time period as inGunsilius (2023). Implementation and data requirements for these new methodsare briefly discussed.

Group-Heterogeneous Changes-in-Changes and Distributional Synthetic Controls