[R-meta] origin of "sandwich"

[Sicong Liu]

Dear All,

I have a burning question regarding the origin of the word �sandwich� that frequently appears in meta-analysis (e.g., �Egger sandwich test� and the R package �clubSandwich�). Could some meta tycoon(s) share knowledge/discussion on this?

My vague impression was that �sandwich� may relate to the looking of a linear algebra expression for computing uncertainties. However, I could no longer identify this source (a book I think) and feel much bothered by it. Thank you all in advance!

Best regards,
Sicong (Zone)

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Sicong (Zone) Liu, Ph.D.
Research Associate
University of Pennsylvania

3620 Walnut Street,
Philadelphia, PA 19104-6220
Email: zone using upenn.edu<mailto:zone using upenn.edu>
Cell: 850-345-5788
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