Rendered project available here. The line is supposed to be a trend line (as rendered with LOESS), but it merely follows each data point instead.

I am no stats wonk, so maybe it makes sense that a LOESS function’s output would match the input as seen in the above example, but it strikes me as being wrong.

Here is the relevant bit of code:

var loess = science.stats.loess().bandwidth(.2);

var xVal = data.map(function(d) { return d.date; });
var yVal = data.map(function(d) { return d.A;    });

var loessData = loess([xVal], [yVal])[0];

console.log(yVal);
console.log(loessData);