qcc: Set LCL to zero in u-chart

General
1

Hi,

Does anyone know how to set the LCL-values = 0 in a u-chart created by qcc while keeping the variable UCL-values?

qcc(X1$station,
type = "u",
sizes = X1$sample_size
)

We used limits = c(0, 21) for our c-charts but as u-charts create variable UCL-values we could not apply it the same way.

Cheers!

2

It is ugly, but it seems to work.

LIMITS <- qcc(X1$station,
    type = "u",
    sizes = X1$sample_size,
    plot = FALSE
)$limits

LIMITS[,1] <- 0

qcc(X1$station,
    type = "u",
    sizes = X1$sample_size,
    limits = LIMITS
)
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3

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