Kirby2 {NISTnls} | R Documentation |
The Kirby2
data frame has 151 rows and 2 columns of data from an
NIST study on scanning electron microscope line width standards.
y |
A numeric vector of response values. |
x |
A numeric vector of input values. |
This data frame contains the following columns:
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.
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))