Bar graph added.

node_modules/vega-statistics/src/bootstrapCI.js

@@ -0,0 +1,26 @@
+import numbers from './numbers';
+import {random} from './random';
+import {ascending, quantile} from 'd3-array';
+
+export default function(array, samples, alpha, f) {
+  if (!array.length) return [undefined, undefined];
+
+  var values = Float64Array.from(numbers(array, f)),
+      n = values.length,
+      m = samples,
+      a, i, j, mu;
+
+  for (j=0, mu=Array(m); j<m; ++j) {
+    for (a=0, i=0; i<n; ++i) {
+      a += values[~~(random() * n)];
+    }
+    mu[j] = a / n;
+  }
+
+  mu.sort(ascending);
+
+  return [
+    quantile(mu, alpha/2),
+    quantile(mu, 1-(alpha/2))
+  ];
+}