NISTnls (version 0.9-13)

Misra1b: Monomolecular Absorption Data

Description

The Misra1b data frame has 14 rows and 2 columns. It is the same data as Misra1a but a different model is fit.

Format

This data frame contains the following columns:

y

A numeric vector of volume values.

x

A numeric vector of pressure values.

Source

Misra, D., NIST (1978). Dental Research Monomolecular Adsorption Study.

Details

These data are the result of a NIST study regarding dental research in monomolecular adsorption. The response variable is volume, and the predictor variable is pressure.

Examples

Try <- function(expr) if (!inherits(val <- try(expr), "try-error")) val
plot(y ~ x, data = Misra1b)
Try(fm1 <- nls(y ~ b1 * (1-(1+b2*x/2)**(-2)), data = Misra1b, trace = TRUE,
           start = c(b1 = 500, b2 = 0.0001) ))
Try(fm1a <- nls(y ~ b1 * (1-(1+b2*x/2)**(-2)), data = Misra1b, trace = TRUE,
           alg = "port", start = c(b1 = 500, b2 = 0.0001) ))
Try(fm2 <- nls(y ~ b1 * (1-(1+b2*x/2)**(-2)), data = Misra1b, trace = TRUE,
           start = c(b1 = 300, b2 = 0.0002) ))
Try(fm2a <- nls(y ~ b1 * (1-(1+b2*x/2)**(-2)), data = Misra1b, trace = TRUE,
           alg = "port", start = c(b1 = 300, b2 = 0.0002) ))
Try(fm3 <- nls(y ~ 1-(1+b2*x/2)**(-2), data = Misra1b, trace = TRUE,
           start = c(b2 = 0.0001), algorithm = "plinear" ))
Try(fm4 <- nls(y ~ 1-(1+b2*x/2)**(-2), data = Misra1b, trace = TRUE,
           start = c(b2 = 0.0005), algorithm = "plinear" ))