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10-22 Aplet Statistics
Calculando valores previstos
As funções PREDX e PREDY estimam (prevêem) os
valores de X ou Y, dado um valor hipotético para uma
das variáveis. A estimativa é feita com base na curva
calculada para se ajustar aos dados, de acordo com o
ajuste específico.
Determinar os
valores
previstos
1. Na visualização Plot, desenhe a curva de regressão
para o conjunto de dados.
2. Pressione para ir para a curva de regressão.
3. Pressione e digite o valor de X. O cursor irá
saltar para o ponto especificado na curva e o visor
de coordenadas irá exibir X e o valor previsto de Y.
Em HOME,
Digite PREDX(y-value)
para determinar o valor previsto para a variável
independente, dado um valor dependente hipotético.
Digite PREDY(x-value) para determinar o valor
previsto da variável dependente, dada uma variável
independente hipotética.
Você pode digitar PREDX e PREDY na linha de edição
ou copiar estes nomes de função do menu MATH, na
categoria Stat-Two.
DICA
Nos casos em que mais de uma curva de ajuste for
exibida, a função PREDY utilizará a curva calculada
mais recentemente. De forma a evitar erros com esta
função, desmarque todos os ajustes, exceto aquele com
o qual você deseja trabalhar, ou use o método da
visualização Plot.
134


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