MACD知识入门
百度百科对MACD的定义：
- MACD称为指数平滑移动平均线，是从双指数移动平均线发展而来的，由快的指数移动平均线（EMA12）减去慢的指数移动平均线（EMA26）得到快线DIF，再用2×（快线DIF-DIF的9日加权移动均线DEA）得到MACD柱。MACD的意义和双移动平均线基本相同，即由快、慢均线的离散、聚合表征当前的多空状态和股价可能的发展变化趋势，但阅读起来更方便。
EMA
-
EMA即英文Exponential Moving Average的缩写，即指数移动平均指标，也叫EXPMA指标。
-
EMA的定义为，当日EMA等于当日收盘价减去昨日EMA之后乘以平滑系数，然后再加上昨日的EMA
EMA(N) = C * 2/(N+1) + EMA' * (N-1)/(N+1)
由上面的公式可以得出EMA12和EMA26的计算公式
EMA(12) = C * 2/(12+1) + EMA' * (12-1)/(12+1)
EMA(26) = C * 2/(26+1) + EMA' * (26-1)/(26+1)
假设要计算从股票上市起第n日的EMA，计为EMAn则有：
平滑系数：
最终精简公式为：
DIF
DIF=EMA（12）- EMA（26）
新股上市首日，其首日DIF为0。从次日开始，全部都用当天的EMA（12）- EMA（26）得到当天的DIF。
DEA
DEA通用公式：
MACD指标公式及其分解-网上其他资料几乎全是错的
DEA’表示昨日的DEA。
这个公式可以模仿普通EMA的展开式展开，这里不再详述。
默认的DEA即DIF线的9日指数平滑移动平均线，也可以表示为MEA(DIF，9)。
MACD指标公式及其分解-网上其他资料几乎全是错的
新股上市首日，其首日DEA为0。从次日开始，由于首日DEA为0，因此次日的DEA=0.2* DIF+0=0.2DIF。后续日子的DEA可以套用0.2DIF + 0.8* DEA’计算。
BAR
BAR=2* (DIF-DEA)
[引用]
- 关于MACD公式介绍
MACD js实践
MACD.js
function EMA(fNow,fPre,N){
return Number((fNow * 2 / (N + 1) + fPre * (N - 1) / (N + 1)).toFixed(2));
}
/**
* 计算EMA12和EMA26
*/
function EMASL(points,N){
if (points == null || points.length <= 0 || N == 0)
return new Array();
let result = new Array();
for(let i=0;i<points.length;i++){
let candle = points[i];
if(i == 0){//第一天的EMA为收盘价
result.push(points[i].c);
}else{
result.push(EMA(points[i].c,result[i-1],N));
}
}
return result;
}
function DIF(points){
if (points == null || points.length <= 0)
return new Array();
let EMAS = EMASL(points,12);
let EMAL = EMASL(points,26);
let DIFs = new Array();
for(let i =0;i<EMAL.length;i++){
DIFs.push(formartNumber(EMAS[i]-EMAL[i]));
}
return DIFs;
}
function DEA(points,N){
if (points == null || points.length <= 0)
return new Array();
let dif = DIF(points);
let result = new Array();
for(let i=0;i<points.length;i++){
if(i == 0){
result.push(0);
}else{
result.push(EMA(dif[i],result[i-1],N));
}
}
return result;
}
function BAR(points){
if (points == null || points.length <= 0)
return new Array();
let dif = DIF(points);
let dea = DEA(points,9);
let bar = new Array();
for(let i=0;i<points.length;i++){
bar.push(2*(formartNumber(dif[i]-dea[i])));
}
return bar;
}
function formartNumber(n){
return Number(n.toFixed(2));
}
MACD.html
<head>
<title>MEDAtitle>
<script src="data.js">script>
<script src="MEDA.js">script>
<script src="https://cdn.hcharts.cn/highcharts/highcharts.js">script>
head>
<body>
<div id="container" style="min-width:800px;height:400px">div>
<script type="text/javascript">
let num = 1.123;
alert(typeof num.toFixed(2));
let EMAS = EMASL(json,12);
let EMAL = EMASL(json,26);
// console.log(EMAS);
// console.log(EMAL);
let dif = DIF(json);
console.log(dif);
let dea = DEA(json,9);
console.log(dea);
let bar = BAR(json);
// console.log(bar);
let time = [];
for(let i=0;i<json.length;i++){
time.push(json[i].trddate);
}
var chart = new Highcharts.Chart('container', {// 图表初始化函数，其中 container 为图表的容器 div
chart: {
type: 'line',
backgroundColor:'#323749',
height: '470px'
//指定图表的类型，默认是折线图（line）
},
title: {
text: 'MACD' //指定图表标题
},
xAxis: {
lineColor: '#5C6475',
lineWidth: 0.5,
tickColor:'#5C6475',
categories:time
},
yAxis: {
title: {
text: 'MACD' //指定y轴的标题
},
gridLineColor: '#5C6475',
gridLineWidth: 0.5
},
series: [{ //指定数据列
name: 'DIF', //数据列名
data: dif,
// color:'#ffff00',
color:'#ffffff',
marker: {
enabled: false,
} //数据
}, {
name: 'DEA',
data: dea,
color:'#ffff00',
marker: {
enabled: false,
}
}
,{
name:'BAR',
data:bar,
color:'#ffffff',
marker: {
enabled: false,
}
}
]
});
script>
body>
html>
data.js
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