function phi(table) {
return (table[3] * table[0] - table[2] * table[1]) /
Math.sqrt((table[2] + table[3]) *
(table[0] + table[1]) *
(table[1] + table[3]) *
(table[0] + table[2]));
}
function tableFor(event, journal) {
let table = [0, 0, 0, 0];
for (let i = 0; i < journal.length; i++) {
let entry = journal[i], index = 0;
if (entry.events.includes(event)) index += 1;
if (entry.squirrel) index += 2;
table[index] += 1;
}
return table;
}
function test(JOURNAL){
for (let entry of JOURNAL) {
if (entry.events.includes("peanuts") &&
!entry.events.includes("brushed teeth")) {
entry.events.push("peanut teeth");
}
}
console.log(phi(tableFor("peanut teeth", JOURNAL)));
}
var JOURNAL = [
{"events":["carrot","exercise","weekend"],"squirrel":false},
{"events":["bread","pudding","brushed teeth","weekend","touched tree"],"squirrel":false},
{"events":["carrot","nachos","brushed teeth","cycling","weekend"],"squirrel":false},
{"events":["brussel sprouts","ice cream","brushed teeth","computer","weekend"],"squirrel":false},
{"events":["potatoes","candy","brushed teeth","exercise","weekend","dentist"],"squirrel":false},
{"events":["brussel sprouts","pudding","brushed teeth","running","weekend"],"squirrel":false},
{"events":["pizza","brushed teeth","computer","work","touched tree"],"squirrel":false},
{"events":["bread","beer","brushed teeth","cycling","work"],"squirrel":false},
{"events":["cauliflower","brushed teeth","work"],"squirrel":false},
{"events":["pizza","brushed teeth","cycling","work"],"squirrel":false},
{"events":["lasagna","nachos","brushed teeth","work"],"squirrel":false},
{"events":["brushed teeth","weekend","touched tree"],"squirrel":false},
{"events":["lettuce","brushed teeth","television","weekend"],"squirrel":false},
{"events":["spaghetti","brushed teeth","work"],"squirrel":false},
{"events":["brushed teeth","computer","work"],"squirrel":false},
{"events":["lettuce","nachos","brushed teeth","work"],"squirrel":false},
{"events":["carrot","brushed teeth","running","work"],"squirrel":false},
{"events":["brushed teeth","work"],"squirrel":false},
{"events":["cauliflower","reading","weekend"],"squirrel":false},
{"events":["bread","brushed teeth","weekend"],"squirrel":false},
{"events":["lasagna","brushed teeth","exercise","work"],"squirrel":false},
{"events":["spaghetti","brushed teeth","reading","work"],"squirrel":false},
{"events":["carrot","ice cream","brushed teeth","television","work"],"squirrel":false},
{"events":["spaghetti","nachos","work"],"squirrel":false},
{"events":["cauliflower","ice cream","brushed teeth","cycling","work"],"squirrel":false},
{"events":["spaghetti","peanuts","computer","weekend"],"squirrel":true},
{"events":["potatoes","ice cream","brushed teeth","computer","weekend"],"squirrel":false},
{"events":["potatoes","ice cream","brushed teeth","work"],"squirrel":false},
{"events":["peanuts","brushed teeth","running","work"],"squirrel":false},
{"events":["potatoes","exercise","work"],"squirrel":false},
{"events":["pizza","ice cream","computer","work"],"squirrel":false},
{"events":["lasagna","ice cream","work"],"squirrel":false},
{"events":["cauliflower","candy","reading","weekend"],"squirrel":false},
{"events":["lasagna","nachos","brushed teeth","running","weekend"],"squirrel":false},
{"events":["potatoes","brushed teeth","work"],"squirrel":false},
{"events":["carrot","work"],"squirrel":false},
{"events":["pizza","beer","work","dentist"],"squirrel":false},
{"events":["lasagna","pudding","cycling","work"],"squirrel":false},
{"events":["spaghetti","brushed teeth","reading","work"],"squirrel":false},
{"events":["spaghetti","pudding","television","weekend"],"squirrel":false},
{"events":["bread","brushed teeth","exercise","weekend"],"squirrel":false},
{"events":["lasagna","peanuts","work"],"squirrel":true},
{"events":["pizza","work"],"squirrel":false},
{"events":["potatoes","exercise","work"],"squirrel":false},
{"events":["brushed teeth","exercise","work"],"squirrel":false},
{"events":["spaghetti","brushed teeth","television","work"],"squirrel":false},
{"events":["pizza","cycling","weekend"],"squirrel":false},
{"events":["carrot","brushed teeth","weekend"],"squirrel":false},
{"events":["carrot","beer","brushed teeth","work"],"squirrel":false},
{"events":["pizza","peanuts","candy","work"],"squirrel":true},
{"events":["carrot","peanuts","brushed teeth","reading","work"],"squirrel":false},
{"events":["potatoes","peanuts","brushed teeth","work"],"squirrel":false},
{"events":["carrot","nachos","brushed teeth","exercise","work"],"squirrel":false},
{"events":["pizza","peanuts","brushed teeth","television","weekend"],"squirrel":false},
{"events":["lasagna","brushed teeth","cycling","weekend"],"squirrel":false},
{"events":["cauliflower","peanuts","brushed teeth","computer","work","touched tree"],"squirrel":false},
{"events":["lettuce","brushed teeth","television","work"],"squirrel":false},
{"events":["potatoes","brushed teeth","computer","work"],"squirrel":false},
{"events":["bread","candy","work"],"squirrel":false},
{"events":["potatoes","nachos","work"],"squirrel":false},
{"events":["carrot","pudding","brushed teeth","weekend"],"squirrel":false},
{"events":["carrot","brushed teeth","exercise","weekend","touched tree"],"squirrel":false},
{"events":["brussel sprouts","running","work"],"squirrel":false},
{"events":["brushed teeth","work"],"squirrel":false},
{"events":["lettuce","brushed teeth","running","work"],"squirrel":false},
{"events":["candy","brushed teeth","work"],"squirrel":false},
{"events":["brussel sprouts","brushed teeth","computer","work"],"squirrel":false},
{"events":["bread","brushed teeth","weekend"],"squirrel":false},
{"events":["cauliflower","brushed teeth","weekend"],"squirrel":false},
{"events":["spaghetti","candy","television","work","touched tree"],"squirrel":false},
{"events":["carrot","pudding","brushed teeth","work"],"squirrel":false},
{"events":["lettuce","brushed teeth","work"],"squirrel":false},
{"events":["carrot","ice cream","brushed teeth","cycling","work"],"squirrel":false},
{"events":["pizza","brushed teeth","work"],"squirrel":false},
{"events":["spaghetti","peanuts","exercise","weekend"],"squirrel":true},
{"events":["bread","beer","computer","weekend","touched tree"],"squirrel":false},
{"events":["brushed teeth","running","work"],"squirrel":false},
{"events":["lettuce","peanuts","brushed teeth","work","touched tree"],"squirrel":false},
{"events":["lasagna","brushed teeth","television","work"],"squirrel":false},
{"events":["cauliflower","brushed teeth","running","work"],"squirrel":false},
{"events":["carrot","brushed teeth","running","work"],"squirrel":false},
{"events":["carrot","reading","weekend"],"squirrel":false},
{"events":["carrot","peanuts","reading","weekend"],"squirrel":true},
{"events":["potatoes","brushed teeth","running","work"],"squirrel":false},
{"events":["lasagna","ice cream","work","touched tree"],"squirrel":false},
{"events":["cauliflower","peanuts","brushed teeth","cycling","work"],"squirrel":false},
{"events":["pizza","brushed teeth","running","work"],"squirrel":false},
{"events":["lettuce","brushed teeth","work"],"squirrel":false},
{"events":["bread","brushed teeth","television","weekend"],"squirrel":false},
{"events":["cauliflower","peanuts","brushed teeth","weekend"],"squirrel":false}
];
test(JOURNAL);
// This makes sure the data is exported in node.js —
// `require('./path/to/jaques_journal.js')` will get you the array.
if (typeof module != "undefined" && module.exports && (typeof window == "undefined" || window.exports != exports))
module.exports = JOURNAL;
if (typeof global != "undefined" && !global.JOURNAL)
global.JOURNAL = JOURNAL;
我的问题是为什么console.log（phi（tableFor（“ peanut tooth”，JOURNAL）））;的结果？是1吗？在期刊中，我们没有“花生牙”，但是为什么它返回1？