Just to complement my previous message:
Checked some of the historical values. Unless a programming mistake, this really looks less enthusiastic. As you can see for the first 12 ETF in the list for which data are available:
Initial historical values before data discontinued in August 2019:
{{1, {2017, 1, 24}}, {2, {2015, 11, 10}}, {3, {2005, 3,
2}}, {4, {2008, 10, 13}}, {5, {2009, 3, 4}}, {6, {2008, 10,
6}}, {7, {2013, 9, 10}}, {8, {2016, 5, 10}}, {9, {2014, 9,
16}}, {10, {2010, 6, 23}}, {11, {2009, 3, 4}}, {12, {2010, 6, 16}}
First historical data available now:
{{1, {2017, 2, 8}}, {2, {2018, 3, 1}}, {3, {2018, 2, 14}}, {4, {2018,
2, 14}}, {5, {2009, 3, 4}}, {6, {2018, 3, 23}}, {7, {2018, 4,
5}}, {8, {2018, 4, 5}}, {9, {2018, 4, 5}}, {10, {2018, 4,
5}}, {11, {2018, 4, 18}}, {12, {2018, 4, 18}},
In this small example, we're talking of having lost in some cases daily data (i.e. number 3) for over 14 years (!) with all the implied statistical lost.
I understand I could nevertheless join the two series from my files...however...
Thanks.