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Torben Jansen
dataviz engineer w/ passion for algorithms, maps & music
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Published
Statistics
By
Torben Jansen
Edited
Mar 5, 2020
1 fork
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17 stars
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bins
=
d3
.
histogram
(
)
.
domain
(
x
.
domain
(
)
)
.
thresholds
(
d3
.
range
(
...
x
.
domain
(
)
,
bin_width
)
)
(
sample
)
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function
dnorm_standard
(
x
)
{
return
1
/
Math
.
sqrt
(
2
*
Math
.
PI
)
*
Math
.
exp
(
-
0.5
*
Math
.
pow
(
x
,
2
)
)
;
}
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function
dnorm
(
x
,
mean
=
0
,
sd
=
1
)
{
return
1
/
sd
*
dnorm_standard
(
(
x
-
mean
)
/
sd
)
}
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function
mean
(
values
)
{
return
values
.
reduce
(
(
sum
,
value
)
=>
sum
+=
value
)
/
values
.
length
;
}
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function
ssd
(
sample
)
{
// total sum of squares
const
sst
=
sample
.
map
(
x
=>
Math
.
pow
(
x
-
sample_mean
,
2
)
)
.
reduce
(
(
sum
,
value
)
=>
sum
+=
value
)
;
return
Math
.
sqrt
(
1
/
(
sample
.
length
-
1
)
*
sst
)
;
}
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normal_curve
=
{
const
points
=
[
]
;
for
(
let
value
of
d3
.
range
(
...
x
.
domain
(
)
,
bin_width
/
10
)
)
{
points
.
push
(
[
value
,
dnorm
(
value
,
sample_mean
,
sample_sd
)
*
bin_width
*
sample_size
]
)
}
return
points
;
}
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sample
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σ
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