VALOR DE R2 E A QUALIDADE DE UMA CURVA ANALÍTICA
Autor: Luiz Ramalho- Consultor/Auditor/Instrutor em Cursos e Treinamentos | Publicado: 2011-11-22T18:24:00-02:00

PORQUE 1 É CONSIDERADO O VALOR IDEAL DO COEFICIENTE DE DETERMINAÇÃO DE REGRESSÃO (R2) DE UMA CURVA ANALÍTICA?
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 <![endif]-->  Uma das finalidades para as quais mais utilizo o blog é para esclarecer dúvidas de clientes meus, que percebo não serem exclusivas apenas daquele cliente, mas que outras pessoas também têm.
  Nesta postagem, a exemplo do que já fiz em outras anteriores, estarei fazendo isso.
  Recentemente, recebi um e-mail do Coordenador de QSMS de uma importante empresa que atendo, no qual ele me perguntava porque quanto mais próximo de 1 for o coeficiente que empregamos para avaliar uma curva analítica, melhor será a qualidade da curva. Eis a explicação:
  Quanto melhor a equação da reta, que determinamos por regressão linear e adotamos como nossa curva analítica, explicar a variação da variável dependente y, que no caso, é o sinal analítico, pela variação da variável independente x, que em uma curva analítica, é a concentração do analito, melhor será a qualidade da curva. &nbsp;&nbsp;&nbsp;  O valor do coeficiente de determinação da regressão (r2) expressa numericamente o percentual da variação total do sinal analítico (y) explicado pela variação da concentração do analito (x).
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  Esse percentual, como qualquer outro, varia de 0 a 100% e o valor de r2, sendo a expressão numérica do mesmo, variará então, de 0 a 1.
  Portanto:   0≤R2≤1
  O ideal é que toda variação apresentada por y seja explicada pela variação de x. Portanto, quanto mais próximo de 100% for o percentual da variação observada para o sinal analítico explicado pela variação da concentração, o que significa, um valor de r2 mais próximo de 1, melhor será a qualidade de nossa curva analítica, pois mais precisa será a representação pela equação da reta obtida na regressão, da variação da resposta analítica em função do teor do analito.
  André, espero que você tenha entendido, assim como, também todas as outras pessoas que tinham essa mesma dúvida.
  Reitero que estarei sempre à disposição de meus clientes bem como dos leitores e seguidores do blog para esclarecer as dúvidas que tenham. Será um grande prazer para mim.
  Até uma próxima!
Abraços,
Luiz