All data for the index should be in the /Index2019 folder. Journal Articles are in the journal articles folder. The methods in these are now, however, outdated. The other files are for creating graphs and figures currently hosted on the Good Ancestor website.
If you notice something weird, you can submit an issue here.
The changelog summarises updates to the current version.
Attribution should be as follows: Intergenerational Solidarity Index 2019 by Jamie McQuilkin. Published in The Good Ancestor: How to Think Long Term in a Short-Term World by Roman Krznaric. Data available at github.com/pipari/ISI. Licensed under CC BY-NC-SA.