Re:Show HN: Stock Performance of US Senators
by all2 on Wednesday June 03, 2020 @07:06PM
(#23410081)
Where does this signal come from in a time-sequence series? I looked up "common mode signal" and in EE it looks like line to line interference, or line to ground interference. Does the existence of this signal presume a Senate's portfolio performance is somehow coupled to some index fund performance (S&P in this case)?
[ Parent
| on HN ]
Re:Show HN: Stock Performance of US Senators
by mehrdadn on Wednesday June 03, 2020 @07:17PM
(#23410181)
The common-signal would just be the general stock market performance. S&P is one way to approximate "the market". The idea being that you want a plot to show you how well they're doing in terms of market performance, not in terms of absolute share price (which is kind of meaningless here). Otherwise every shock to the general market ends up getting rendered in every line in the plot which is pretty distracting and makes it hard to see what's going on.
Re:Show HN: Stock Performance of US Senators
by mhh__ on Wednesday June 03, 2020 @07:57PM
(#23410621)
I'm not entirely sure either but you could use some combination of dS/dt dI/dt where S is the senator and I is the market?