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- Log Collection
- Collection Overview
- Collecting Logs in Self-Built Kubernetes Cluster
- Collecting Syslog
- Collection by LogListener
- Collecting Text Log
- Uploading Log over Kafka
- Uploading Logs via Anonymous Write
- Uploading Logs via Logback Appender
- Uploading Logs via Log4j Appender
- Uploading Log via SDK
- Uploading Log via API
- Importing Data
- Tencent Cloud Service Log Access
- Log Storage
- Search and Analysis
- Syntax and Rules
- Statistical Analysis (SQL)
- Quick Analysis
- SQL Syntax
- SQL Functions
- String Function
- Date and Time Functions
- IP Geographic Function
- URL Function
- Mathematical Calculation Functions
- Mathematical Statistical Function
- General Aggregate Function
- Geospatial Function
- Binary String Function
- Estimation Function
- Type Conversion Function
- Logical Function
- Operators
- Bitwise Operation
- Regular Expression Function
- Lambda Function
- Conditional Expressions
- Array Functions
- Interval-Valued Comparison and Periodicity-Valued Comparison Functions
- JSON Functions
- Window Functions
- Sampling Analysis
- Configuring Indexes
- Reindexing
- Context Search and Analysis
- Downloading Log
- Dashboard
- Data Processing documents
- Data Processing
- Creating Processing Task
- Viewing Data Processing Details
- Data Processing Functions
- Function Overview
- Key-Value Extraction Functions
- Enrichment Functions
- Flow Control
- Row Processing Functions
- Field Processing Functions
- Value Structuring Functions
- Regular Expression Processing Functions
- Time Value Processing Functions
- String Processing Functions
- Type Conversion Functions
- Logical and Mathematical Functions
- Encoding and Decoding Functions
- IP Parsing Functions
- Processing Cases
- Scheduled SQL Analysis
- SCF
- Data Processing
- Shipping and Consumption
- Log Shipping
- Monitoring Alarm
- Historical Documentation
- Best Practices
- Developer Guide
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Topic Management APIs
- Log Set Management APIs
- Index APIs
- Topic Partition APIs
- Machine Group APIs
- Collection Configuration APIs
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- Metric APIs
- Alarm Policy APIs
- Data Processing APIs
- Kafka Protocol Consumption APIs
- CKafka Shipping Task APIs
- Kafka Data Subscription APIs
- COS Shipping Task APIs
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- Scheduled SQL Analysis APIs
- COS Data Import Task APIs
- Data Types
- Error Codes
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- Glossary
This document introduces the basic syntax and examples of mathematical statistical functions.
Basic syntax
Function | Description |
corr(key1, key2) | Returns the correlation coefficient of two columns. The calculation result range is [0,1]. |
covar_pop(key1, key2) | Returns the population covariance of two columns. |
covar_samp(key1, key2) | Returns the sample covariance of two columns. |
regr_intercept(key1, key2) | Returns linear regression intercept of input values. key1 is the dependent value. key2 is the independent value. |
regr_slope(key1, key2) | Returns linear regression slope of input values. key1 is the dependent value. key2 is the independent value. |
stddev(key) | Returns the sample standard deviation of the key column. This function is equivalent to the stddev_samp function. |
stddev_samp(key) | Returns the sample standard deviation of the key column. |
stddev_pop(key) | Returns the population standard deviation of the key column. |
variance(key) | Returns the sample variance of the key column. This function is equivalent to the var_samp function. |
var_samp(key) | Returns the sample variance of the key column. |
var_pop(key) | Returns the population variance of the key column. |
Example
Returns the correlation between data in the
timeCost (response time) and SamplingRate (sampling rate) columns:* | select corr(timeCost,SamplingRate)
Yes
No
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