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A data analysis tool detects outliers using the IQR method or z-scores, and computes descriptive statistics. Outlier detection is the first step in data cleaning.
Fórmula
- IQR
- Q3 − Q1 — Q3 − Q1
- Q3
- Q3 value — Variable used in the calculation
- Q1
- Q1 value — Variable used in the calculation
Guia passo a passo
- 1IQR = Q3 − Q1
- 2Outlier: value < Q1−1.5×IQR or > Q3+1.5×IQR
- 3Z-score: (x − mean)/SD; outlier if |z| > 2 or 3
- 4IQR method is robust; z-score assumes normal distribution
Exemplos resolvidos
Perguntas frequentes
What is Data Analysis?
A data analysis tool detects outliers using the IQR method or z-scores, and computes descriptive statistics. Outlier detection is the first step in data cleaning
How accurate is the Data Analysis calculator?
The calculator uses the standard published formula for data analysis. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.
What units does the Data Analysis calculator use?
This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.
What formula does the Data Analysis calculator use?
The core formula is: IQR = Q3 − Q1. Each step in the calculation is shown so you can verify the result manually.