Ruby commands Flashcards
1
Q
ddist(x, pars)
A
density function
gives the z-score for x
2
Q
pdist(u, pars)
A
cumulative distribution/probability function
gives the area under the curve and thus a probability
3
Q
qdist(alpha, pars)
A
alpha-quantile
also:
gives the value q such that pdist(q, par) = alpha
4
Q
rdist(size, pars)
A
Gives random samples from the dist with parameter par
5
Q
Distributions in Ruby
A
norm
binom
pois
unif
6
Q
mean(x)
A
Calculate the mean of X
7
Q
var(x)
A
Calculate the variance of X
8
Q
med(x)
A
Calculate the median of X
9
Q
sd(x)
A
Calculate the standard deviation of X
10
Q
quantile(x,a)
A
Calculate the a’th quantile of X
11
Q
summary(x)
A
Gives several summarizing calculations of X
12
Q
range(x)
A
Returns the min and max value of X
13
Q
edcf(x)
A
Returns the empirical/cumulative distribution function of X
