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stddev
stddev(numericExpression)
說明
stddev
函式會傳回所有可能值的標準差。
參數資料類型
NUMBER
傳回類型
NUMBER
程式碼範例
範例
找出 target.ip
不為空白的所有事件。針對與 principal.ip
相符的所有事件,請將 metadata.event_timestamp.seconds
的標準差儲存在名為 stddev_seconds
的變數中。
target.ip != ""
match:
principal.ip
outcome:
$stddev_seconds = stddev(metadata.event_timestamp.seconds)
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上次更新時間:2025-07-29 (世界標準時間)。
[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["難以理解","hardToUnderstand","thumb-down"],["資訊或程式碼範例有誤","incorrectInformationOrSampleCode","thumb-down"],["缺少我需要的資訊/範例","missingTheInformationSamplesINeed","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["上次更新時間:2025-07-29 (世界標準時間)。"],[[["\u003cp\u003eThe \u003ccode\u003estddev\u003c/code\u003e function calculates the standard deviation across a set of numeric values.\u003c/p\u003e\n"],["\u003cp\u003eIt accepts a \u003ccode\u003eNUMBER\u003c/code\u003e data type as input, represented by the \u003ccode\u003enumericExpression\u003c/code\u003e parameter.\u003c/p\u003e\n"],["\u003cp\u003eThe function's output is a \u003ccode\u003eNUMBER\u003c/code\u003e representing the calculated standard deviation.\u003c/p\u003e\n"],["\u003cp\u003eAn example use case includes calculating the standard deviation of \u003ccode\u003emetadata.event_timestamp.seconds\u003c/code\u003e for events matching \u003ccode\u003eprincipal.ip\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,["### stddev\n\n stddev(numericExpression)\n\n#### Description\n\nThe `stddev` function returns the standard deviation over all the possible\nvalues.\n\n#### Param data types\n\n`NUMBER`\n\n#### Return type\n\n`NUMBER`\n\n#### Code Samples\n\n##### Example\n\nFind all the events where `target.ip` is not empty. For all the events that\nmatch on `principal.ip`, store the standard deviation of\n`metadata.event_timestamp.seconds` in a variable called `stddev_seconds`. \n\n target.ip != \"\"\n match:\n principal.ip\n outcome:\n $stddev_seconds = stddev(metadata.event_timestamp.seconds)"]]