Bennett5 {NISTnls} | R Documentation |
The Bennett5
data frame has 154 rows and 2 columns of data from a
magnetism study
y |
A numeric vector of magnetism values. |
x |
A numeric vector of log(time). |
This data frame contains the following columns:
These data are the result of a NIST study involving superconductivity magnetization modeling. The response variable is magnetism, and the predictor variable is the log of time in minutes.
Bennett, L., L. Swartzendruber, and H. Brown, NIST (1994). Superconductivity Magnetization Modeling.
library(NISTnls) data(Bennett5) plot(y ~ x, data = Bennett5) fm1 <- nls(y ~ b1*(b2+x)**(-1/b3), data = Bennett5, start = c(b1 = -2000, b2 = 50, b3 = 0.8), trace = TRUE) fm2 <- nls(y ~ b1*(b2+x)**(-1/b3), data = Bennett5, start = c(b1 = -1500, b2 = 45, b3 = 0.85), trace = TRUE) fm3 <- nls(y ~ (b2+x)**(-1/b3), data = Bennett5, alg = "plinear", start = c( b2 = 50, b3 = 0.8), trace = TRUE) fm4 <- nls(y ~ (b2+x)**(-1/b3), data = Bennett5, alg = "plinear", start = c( b2 = 50, b3 = 0.8), trace = TRUE)