Chwirut1 {NISTnls} | R Documentation |
The Chwirut1
data frame has 214 rows and 2 columns giving
y |
A numeric vector of ultrasonic response values |
x |
A numeric vector or metal distance values |
This data frame contains the following columns:
These data are the result of a NIST study involving ultrasonic calibration. The response variable is ultrasonic response, and the predictor variable is metal distance.
Chwirut, D., NIST (197?). Ultrasonic Reference Block Study.
library(NISTnls) data(Chwirut1) plot(y ~ x, data = Chwirut1) fm1 <- nls(y ~ exp(-b1*x)/(b2+b3*x), data = Chwirut1, trace = TRUE, start = c(b1 = 0.1, b2 = 0.01, b3 = 0.02)) fm2 <- nls(y ~ exp(-b1*x)/(b2+b3*x), data = Chwirut1, trace = TRUE, start = c(b1 = 0.15, b2 = 0.008, b3 = 0.010)) fm3 <- nls(y ~ exp(-b1*x)/(1+p3*x), data = Chwirut1, trace = TRUE, start = c(b1 = 0.1, p3 = 0.02/0.01), algorithm = "plinear") fm4 <- nls(y ~ exp(-b1*x)/(1+p3*x), data = Chwirut1, trace = TRUE, start = c(b1 = 0.15, p3 = 0.01/0.008), algorithm = "plinear")