Um gráfico de tornado é semelhante a um funil dividido em duas partes. Um indicador é apresentado à esquerda e outro à direita. Um gráfico de tornado fornece uma comparação de dois indicadores, com ênfase não dentro de uma categoria, mas na correlação como um todo. Os gráficos de tornado ajudam-te a comparar os valores de dois indicadores e a avaliar visualmente o impacto de um deles no outro.
Neste capítulo, analisaremos os dados de vendas por gestores e cidades:
Receitas (sinónimo de vendas efectivas)
Objetivo de vendas
Lucro (sinónimo de margem real)
Quantidade (unidades vendidas)
Na Figura 13-1, podes ver que quanto maior for o lucro, maiores serão as receitas.
Figura 13-1. O gráfico de tornados mostra a correlação entre lucros e receitas
Poderíamos mostrar os mesmos dados no gráfico de barras (ver Figura 13-2), mas ao comparar dados de diferentes escalas, as barras com valores de indicadores mais pequenos (no nosso caso, o lucro) podem quase desaparecer, e o verdadeiro significado do gráfico perde-se.
Figura 13-2. A comparação de dois indicadores de escalas diferentes ...
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