Maxima Function
test_normality (x)
Shapiro-Wilk test for normality. Argument x is a list of numbers, and sample
size must be greater than 2 and less or equal than 5000, otherwise, function
test_normality
signals an error message.
Reference:
[1] Algorithm AS R94, Applied Statistics (1995), vol.44, no.4, 547-551
The output of function test_normality
is an inference_result
Maxima object
with the following results:
'statistic
: value of the W statistic.
'p_value
: p-value under normal assumption.
Examples:
Checks for the normality of a population, based on a sample of size 9.
(%i1) load("stats")$ (%i2) x:[12,15,17,38,42,10,23,35,28]$ (%i3) test_normality(x); | SHAPIRO - WILK TEST | (%o3) | statistic = .9251055695162436 | | p_value = .4361763918860381