summary.nls
Summarizing Non-Linear Least-Squares Model Fits
Description
summary
method for class "nls"
.
Usage
## S3 method for class 'nls' summary(object, correlation = FALSE, symbolic.cor = FALSE, ...) ## S3 method for class 'summary.nls' print(x, digits = max(3, getOption("digits") - 3), symbolic.cor = x$symbolic.cor, signif.stars = getOption("show.signif.stars"), ...)
Arguments
object | an object of class |
x | an object of class |
correlation | logical; if |
digits | the number of significant digits to use when printing. |
symbolic.cor | logical. If |
signif.stars | logical. If |
... | further arguments passed to or from other methods. |
Details
The distribution theory used to find the distribution of the standard errors and of the residual standard error (for t ratios) is based on linearization and is approximate, maybe very approximate.
print.summary.nls
tries to be smart about formatting the coefficients, standard errors, etc. and additionally gives ‘significance stars’ if signif.stars
is TRUE
.
Correlations are printed to two decimal places (or symbolically): to see the actual correlations print summary(object)$correlation
directly.
Value
The function summary.nls
computes and returns a list of summary statistics of the fitted model given in object
, using the component "formula"
from its argument, plus
residuals | the weighted residuals, the usual residuals rescaled by the square root of the weights specified in the call to |
coefficients | a p x 4 matrix with columns for the estimated coefficient, its standard error, t-statistic and corresponding (two-sided) p-value. |
sigma | the square root of the estimated variance of the random error σ^2 = 1/(n-p) Sum(R[i]^2), where R[i] is the i-th weighted residual. |
df | degrees of freedom, a 2-vector (p, n-p). (Here and elsewhere n omits observations with zero weights.) |
cov.unscaled | a p x p matrix of (unscaled) covariances of the parameter estimates. |
correlation | the correlation matrix corresponding to the above |
symbolic.cor | (only if |
See Also
The model fitting function nls
, summary
.
Function coef
will extract the matrix of coefficients with standard errors, t-statistics and p-values.
Copyright (©) 1999–2012 R Foundation for Statistical Computing.
Licensed under the GNU General Public License.