Description Format Details Source Examples
The Kirby2
data frame has 151 rows and 2 columns of data from an
NIST study on scanning electron microscope line width standards.
This data frame contains the following columns:
A numeric vector of response values.
A numeric vector of input values.
These data are the result of a NIST study involving scanning electron microscope line with standards.
Kirby, R., NIST (197?). Scanning electron microscope line width standards.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24  Try < function(expr) if (!inherits(val < try(expr), "tryerror")) val
plot(y ~ x, data = Kirby2)
Try(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)))
Try(fm1a < nls(y ~ (b1 + b2*x + b3*x**2) / (1 + b4*x + b5*x**2),
data = Kirby2, trace = TRUE, alg = "port",
start = c(b1 = 2, b2 = 0.1, b3 = 0.003,
b4 = 0.001, b5 = 0.00001)))
Try(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)))
Try(fm2a < nls(y ~ (b1 + b2*x + b3*x**2) / (1 + b4*x + b5*x**2),
data = Kirby2, trace = TRUE, alg = "port",
start = c(b1 = 1.5, b2 = 0.15, b3 = 0.0025,
b4 = 0.0015, b5 = 0.00002)))
Try(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)))
Try(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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