tech.tablesaw.api.plot.Control Maven / Gradle / Ivy
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package tech.tablesaw.api.plot;
import tech.tablesaw.api.DoubleColumn;
import tech.tablesaw.api.IntColumn;
import tech.tablesaw.api.NumericColumn;
import tech.tablesaw.plotting.xchart.XchartLine;
import tech.tablesaw.util.BitmapBackedSelection;
/**
* A control chart
* Displays the data column in sequence, with upper and lower control lines set by default
* at + or - 3 standard deviations from the mean
*/
public class Control {
public static void show(String name, NumericColumn data) {
show(name, data, 0, data.size());
}
public static void show(String name, NumericColumn sourceData, int controlRangeStart, int controlRangeEnd) {
BitmapBackedSelection selection = new BitmapBackedSelection();
selection.addRange(controlRangeStart, controlRangeEnd);
NumericColumn data = (NumericColumn) sourceData.subset(selection);
double avg = data.mean();
double stdDev = data.standardDeviation();
double controlLimit = 3 * stdDev;
show(name, data, avg, controlLimit);
}
public static void show(String name, NumericColumn data, double avg, double controlLimit) {
IntColumn index = new IntColumn("Observations");
DoubleColumn mean = new DoubleColumn("Mean");
DoubleColumn ucl = new DoubleColumn("UCL");
DoubleColumn lcl = new DoubleColumn("LCL");
for (int i = 0; i < data.size(); i++) {
index.append(i + 1);
mean.append(avg);
ucl.append(avg + controlLimit);
lcl.append(avg - controlLimit);
}
XchartLine.show(name, index, data, mean, ucl, lcl);
}
}