标准差
最常见的变异(或展开)度量。标准差近似于均值中每个观测值的均差。
相关图表工具
常用统计图形在线生成工具:
Pareto Chart
Bar Chart
Box Plot
Histogram
Line Chart
Scatter Plot
Time Series Plot
Function Grapher
Normal Distribution Graph
Normal Probability Plot
实用工具:
Calendar with weeks
Public Holidays by Countries / Regions
Timer & Countdown
Date Calculator
World Clock & Time Zones