| qqnorm {stats} | R Documentation |
qqnorm is a generic function the default method of which
produces a normal QQ plot of the values in y.
qqline adds a line to a normal quantile-quantile plot which
passes through the first and third quartiles.
qqplot produces a QQ plot of two datasets.
Graphical parameters may be given as arguments to qqnorm,
qqplot and qqline.
qqnorm(y, ...)
## Default S3 method:
qqnorm(y, ylim, main = "Normal Q-Q Plot",
xlab = "Theoretical Quantiles",
ylab = "Sample Quantiles", plot.it = TRUE, datax = FALSE,
...)
qqline(y, datax = FALSE, ...)
qqplot(x, y, plot.it = TRUE, xlab = deparse(substitute(x)),
ylab = deparse(substitute(y)), ...)
x |
The first sample for qqplot. |
y |
The second or only data sample. |
xlab, ylab, main |
plot labels. |
plot.it |
logical. Should the result be plotted? |
datax |
logical. Should data values be on the x-axis? |
ylim, ... |
graphical parameters. |
For qqnorm and qqplot, a list with components
x |
The x coordinates of the points that were/would be plotted |
y |
The original y vector, i.e., the corresponding y
coordinates including NAs. |
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
y <- rt(200, df = 5) qqnorm(y); qqline(y, col = 2) qqplot(y, rt(300, df = 5)) qqnorm(precip, ylab = "Precipitation [in/yr] for 70 US cities")