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using MAT
all_vars= matread("sampledata2.mat")
d = all_vars["data"]
# ----------------------- Q2
length(filter(x -> x > 5, d[:, 2])) / length(d[:, 2])
# 0.19, so first statement is false
length(filter(x -> x > 50, d[:, 1]))
# 56x over 50
length(filter(x -> x < 20, d[:, 1]))
# 4x under 20
# second statement is true
length(filter(x -> x < 5, d[:, 2]))
# 243
length(filter(x -> x > 6, d[:, 2]))
# 34
# third statement is false
length(filter(x -> x > 0.5, d[:, 3])) / length(d[:, 3])
# 0.5233333333333333
# last statement is false
# ----------------------- Q3
using Winston
# TODO: this foldl business is ugly
with_cancer = foldl(vcat, filter(x -> x[3] > 0.5, [d[row, :] for row = 1:size(d,1)]))
without_cancer = foldl(vcat, filter(x -> x[3] < 0.5, [d[row, :] for row = 1:size(d,1)]))
figure()
p = FramedPlot()
add(p, Histogram(hist(with_cancer[:, 1], 15:10:75)..., color="red"))
# 1 NO (this is "without")
# 2 yes
# 3 NO
# 4 NO
# ----------------------- Q4
add(p, Histogram(hist(without_cancer[:, 1], 15:10:75)..., color="green"))
# 1 YES
# ----------------------- Q5
function fractional(f, d)
return length(filter(f, d)) / length(d)
end
fractional(x -> x>55, without_cancer[:, 1])
#0.013986013986013986
fractional(x -> x<25, without_cancer[:, 1])
#0.08391608391608392
# FALSE
fractional(x -> x<35, without_cancer[:, 1])
# FALSE
fractional(x -> x<30, with_cancer[:, 1]) / fractional(x -> x>60, with_cancer[:, 1])
# TRUE!
fractional(x -> x>45, with_cancer[:, 1])
# FALSE
# ----------------------- Q6
fractional(x -> x>35, with_cancer[:, 1])
# 0.802547770700637
# ----------------------- Q7
fractional(x -> x<25, d[:, 1])
# 0.06
# ----------------------- Q8
drinkers = foldl(vcat, filter(x -> x[2] > 3, [d[row, :] for row = 1:size(d,1)]))
fractional(x -> x >0.5, drinkers[:, 3])
# 0.6459627329192547
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