qqnorm(y, ylim, main = "Normal Q-Q Plot", xlab = "Theoretical Quantiles", ylab = "Sample Quantiles", plot.it = TRUE, ...) qqline(y, ...) 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. |
qqnorm
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
and qqplot
, a list with components
x
| The x coordinates of the points that were/would be plotted |
y
| The corresponding y coordinates |
ppoints
.y <- rt(200, df = 5) qqnorm(y); qqline(y, col = 2) qqplot(y, rt(300, df = 5)) data(precip) qqnorm(precip, ylab = "Precipitation [in/yr] for 70 US cities")