公告：凡是在
2025 年 4 月 15 日前註冊使用 Earth Engine 的非商業專案，都必須
驗證非商業用途資格，才能繼續存取 Earth Engine。
ee.Reducer.kendallsCorrelation
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
建立計算 Kendall's Tau-b 等級相關性的縮減器。正 tau 值表示趨勢上升，負值則表示趨勢下降。詳情請參閱 https://commons.apache.org/proper/commons-math/javadocs/api-3.6.1/org/apache/commons/math3/stat/correlation/KendallsCorrelation.html。
| 用量 | 傳回 |
|---|
ee.Reducer.kendallsCorrelation(numInputs) | 縮減函式 |
| 引數 | 類型 | 詳細資料 |
|---|
numInputs | 整數，預設值為 1 | 預期輸入的數量 (1 或 2)。如果指定 1，系統會自動為 x 值產生序號 (表示不能有相同的值)。 |
除非另有註明，否則本頁面中的內容是採用創用 CC 姓名標示 4.0 授權，程式碼範例則為阿帕契 2.0 授權。詳情請參閱《Google Developers 網站政策》。Java 是 Oracle 和/或其關聯企業的註冊商標。
上次更新時間：2025-07-26 (世界標準時間)。
[null,null,["上次更新時間：2025-07-26 (世界標準時間)。"],[[["\u003cp\u003eComputes the Kendall's Tau-b rank correlation, indicating increasing trends with positive values and decreasing trends with negative values.\u003c/p\u003e\n"],["\u003cp\u003eProvides a reducer that can be used with one or two inputs, automatically generating sequence numbers for the x value when only one input is provided.\u003c/p\u003e\n"],["\u003cp\u003eOffers flexibility for analysis by allowing users to specify the number of inputs, accommodating scenarios with or without ties in the x values.\u003c/p\u003e\n"],["\u003cp\u003eBuilt upon the Apache Commons Math library, ensuring reliable and robust correlation calculations based on established statistical methods.\u003c/p\u003e\n"],["\u003cp\u003eEnables the identification of monotonic relationships between variables in Earth Engine, facilitating insights into data patterns and trends.\u003c/p\u003e\n"]]],["This content describes a reducer that calculates Kendall's Tau-b rank correlation. It returns a reducer object and expects one or two numerical inputs. If only one input is provided, the reducer generates sequence numbers for the x-values, ensuring no ties. The output indicates trend direction: positive tau suggests an increasing trend, while negative tau indicates a decreasing one. The `numInputs` argument defines the expected number of inputs, defaulting to one.\n"],null,["# ee.Reducer.kendallsCorrelation\n\nCreates a reducer that computes the Kendall's Tau-b rank correlation. A positive tau value indicates an increasing trend; negative value indicates a decreasing trend. See https://commons.apache.org/proper/commons-math/javadocs/api-3.6.1/org/apache/commons/math3/stat/correlation/KendallsCorrelation.html for details.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-------------------------------------------------|---------|\n| `ee.Reducer.kendallsCorrelation(`*numInputs*`)` | Reducer |\n\n| Argument | Type | Details |\n|-------------|---------------------|------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `numInputs` | Integer, default: 1 | The number of inputs to expect (1 or 2). If 1 is specified, automatically generates sequence numbers for the x value (meaning there can be no ties). |"]]
