node-roc: Technical Indicator for Rate of Change

A simple node module to calculate the Rate of Change and avoid JavaScript precision issues.

Usage:

const data = [
    52.00,
    51.00,
    51.50,
    48.50,
    53.00,
    53.50,
    53.50,
    54.00,
    54.00,
    55.00
]


const roc = new ROC(data, 5);
roc.calculate((err, data) => {
    console.log('data:', data)
});

Returns:

[
    { value: 52.00 },
    { value: 51.00 },
    { value: 51.50 },
    { value: 48.50 },
    { value: 53.00 },
    { value: 53.50, momentum: 1.50, closingPrice: 52.00, roc: 2.8846153846153846 },
    { value: 53.50, momentum: 2.50, closingPrice: 51.00, roc: 4.901960784313726 },
    { value: 54.00, momentum: 2.50, closingPrice: 51.50, roc: 4.854368932038835 },
    { value: 54.00, momentum: 5.50, closingPrice: 48.50, roc: 11.34020618556701 },
    { value: 55.00, momentum: 2.00, closingPrice: 53.00, roc: 3.7735849056603774 }
];