Kirby2 {NISTnls}R Documentation

Microscope line width standards

Description

The Kirby2 data frame has 151 rows and 2 columns of data from an NIST study on scanning electron microscope line width standards.

Arguments

y A numeric vector of response values.
x A numeric vector of input values.

Format

This data frame contains the following columns:

Details

These data are the result of a NIST study involving scanning electron microscope line with standards.

Source

Kirby, R., NIST (197?). Scanning electron microscope line width standards.

Examples

library(NISTnls)
data(Kirby2)
plot(y ~ x, data = Kirby2)
fm1 <- nls(y ~ (b1 + b2*x + b3*x**2) / (1 + b4*x + b5*x**2),
           data = Kirby2, trace = TRUE,
           start = c(b1 = 2, b2 = -0.1, b3 = 0.003, b4 = -0.001, b5 = 0.00001))
fm2 <- nls(y ~ (b1 + b2*x + b3*x**2) / (1 + b4*x + b5*x**2),
           data = Kirby2, trace = TRUE,
           start = c(b1 = 1.5, b2 = -0.15, b3 = 0.0025, b4 = -0.0015,
                     b5 = 0.00002))
fm3 <- nls(y ~ cbind(1, x, x**2)/(1 + x*(b4 + b5*x)),
           data = Kirby2, trace = TRUE, algorithm = "plinear",
           start = c(b4 = -0.001, b5 = 0.00001))
fm4 <- nls(y ~ cbind(1, x, x**2)/(1 + x*(b4 + b5*x)),
           data = Kirby2, trace = TRUE, algorithm = "plinear",
           start = c(b4 = -0.0015, b5 = 0.00002))

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