lmEqn: Plot Points, Fit a Line, Display Equation
In bryanhanson/HandyStuff: Handy Functions & Stuff

lmEqn

R Documentation

Plot Points, Fit a Line, Display Equation

Description

This function plots the points given, then fits a line and displays the regression statistics using lattice.

Usage

lmEqn(
  formula = NULL,
  data = NULL,
  method = "lm",
  leg.loc = c(0.5, 0.5),
  theme = screenTheme(),
  ...
)

Arguments

`formula`	A formula with both LHS and RHS. The formula should comply with the usual `R` standards, for instance `y ~ x`.
`data`	A data frame containing two columns whose names correspond to the specified formula.
`method`	A character string. Either "lm" for linear model or "rlm" for a robust fit.
`leg.loc`	A vector of two numbers (x, y) giving the location of the legend. The values correspond to the units of the data. See the examples.
`theme`	Character; A suitble `lattice` theme. There are two built-in themes which you can use "as is" or modify to your heart's content. If none is given, `screenTheme` will be used. The other option provided is `posterTheme`.
`...`	Additional arguments to be passed downstream.

Value

A plot is drawn and the ggplot2 or lattice object is returned, possibly for further manipulation.

Author(s)

Bryan A. Hanson, DePauw University. hanson@depauw.edu

Examples


require("lattice")
require("latticeExtra")
require("plyr")
require("MASS")

conc = seq(1, 12, length.out = 8)
abs = jitter(conc, factor = 2)*0.1
cc <- data.frame(conc, abs)
lmEqn(formula = abs ~ conc, data = cc, method = "rlm",
leg.loc = c(3, 0.1),
xlab = "concentration", ylab = "absorbance",
main = "Calibration Curve")

bryanhanson/HandyStuff documentation built on July 22, 2022, 6:18 a.m.