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!
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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