Comments on the article “Uncertainty and bias in electronic tide-gauge records: Evidence from collocated sensors” by Stella Pytharouli, Spyros Chaikalis, Stathis C. Stiros in Measurement (Volume 125, September 2018)

This note comments on the article published in Measurement by Stella Pytharouli, Spyros Chaikalis and Stathis C. Stiros (Volume 125, September 2018) entitled “Uncertainty and bias in electronic tide-gauge records: evidence from collocated sensors”. That paper comprises a set of comparisons between sea level data obtained by two or three collocated sensors at 10 sites around the world, using statistical methods akin to the buddy-checking methods that are often used by tide gauge operators. Their paper contains a number of incorrect statements. In addition, its comparison of tide gauge data at the 10 sites, which comprises most of the paper, is flawed in several respects.