/**
* Estimates the mean of array <code>y</code>. <code>robustMu</code> uses a Gaussian model to
* remove outliers iteratively.
*
* @param y an array
* @return the estimated mean of <code>y</code>
*/
private double robustMu(double[] y) {
ArrayList<Double> x = new ArrayList<Double>(y.length);
for (int i = 0; i < y.length; i++) {
x.add(y[i]);
}
double sigma = 0;
NormalDist gaussian = new NormalDist();
double cutoff = 0;
double cutoff1 = 0;
double cutoff2 = 0;
int xSize = x.size();
sigma = std(x);
double areaRemoved = 0.5 / xSize;
cutoff = abs(gaussian.inverseF(areaRemoved));
cutoff1 = -cutoff * sigma + mean(x);
cutoff2 = cutoff * sigma + mean(x);
while (true) {
Iterator<Double> iter = x.iterator();
int numRemoved = 0;
while (iter.hasNext()) {
double cn = iter.next();
if (cn < cutoff1 || cn > cutoff2) {
numRemoved++;
iter.remove();
}
}
if (numRemoved == 0) {
break;
}
sigma = std(x);
sigma =
sigma
/ sqrt(
(1 - 2 * areaRemoved - 2 * cutoff * exp(-pow(cutoff, 2) / 2) / sqrt(2 * PI))
/ (1 - 2 * areaRemoved));
xSize = x.size();
areaRemoved = 0.5 / xSize;
cutoff = abs(gaussian.inverseF(areaRemoved));
cutoff1 = -cutoff * sigma + mean(x);
cutoff2 = cutoff * sigma + mean(x);
}
return mean(x);
}
public FunctionalTest() throws IOException {
Vector v = new Vector();
for (Enumeration e = v.elements(); e.hasMoreElements(); ) {}
IOException e = new IOException();
// this is to test excluding literals
String buz = "text/plain";
// this is to test array handling
ArrayList[] foo = new ArrayList[0];
ArrayList bar = new ArrayList();
bar.add(HashSet.class);
bar.add(Integer.class);
File[] files = (File[]) bar.toArray(new File[0]);
// this is to test imports of inner classes
HashMap biv = new HashMap();
Set set = biv.entrySet();
Iterator iter = set.iterator();
bar.add((Entry) iter.next());
// this is to test inclusion of classes from java.lang.reflect
Modifier m = new Modifier();
// This next one can't be picked up by importscrubber because the compiler inlines it
// System.out.println("A JOptionPane thingy " + JOptionPane.CANCEL_OPTION);
// bummer!
// this is to test importing a class and only calling a static method on it
// Buz.doSomething();
// this is to test NOT importing classes which are fully qualified in the class body
// java.sql.Date sqlDate = new java.sql.Date(20);
// Date javaDate = new Date();
throw new IllegalArgumentException();
}