# Retrieve OnlineStat.Series() statistics
**URL:** https://discourse.julialang.org/t/retrieve-onlinestat-series-statistics/31901
**Category:** General Usage
**Tags:** package
**Created:** [December 5, 2019, 11:50am UTC](https://discourse.julialang.org/t/retrieve-onlinestat-series-statistics/31901 "2019-12-05T11:50:17Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Dario\_Sarra](https://discourse.julialang.org/u/Dario_Sarra)
#### Post date: [December 5, 2019, 11:50am UTC](https://discourse.julialang.org/t/retrieve-onlinestat-series-statistics/31901/1 "2019-12-05T11:50:17Z")
I can’t understand from the docs how can I retrieve a result from a series. Specifically, if I follow the example
```julia
y = rand(1000)
s = Series(Mean(), Variance())
fit!(s, y)
```
And after I want to apply std() to the resulting Variance(), I can’t find a way to subselect the Variance from the series
---
### Author:  [@Dario\_Sarra](https://discourse.julialang.org/u/Dario_Sarra)
#### Post date: [December 5, 2019, 11:53am UTC](https://discourse.julialang.org/t/retrieve-onlinestat-series-statistics/31901/2 "2019-12-05T11:53:49Z")
I just found a way which seems convoluted, but works
```julia
x = randn(10^6)
things = Series(Mean(), Variance())
fit!(things,x)
std(things.stats[2])
```
---
### Author:  [@bernhard](https://discourse.julialang.org/u/bernhard)
#### Post date: [December 5, 2019, 11:55am UTC](https://discourse.julialang.org/t/retrieve-onlinestat-series-statistics/31901/3 "2019-12-05T11:55:57Z")
Have you tried `var(things)` or `std(things)`?
---
### Author:  [@Dario\_Sarra](https://discourse.julialang.org/u/Dario_Sarra)
#### Post date: [December 5, 2019, 11:58am UTC](https://discourse.julialang.org/t/retrieve-onlinestat-series-statistics/31901/4 "2019-12-05T11:58:30Z")
yes it returns this error:
ERROR: MethodError: no method matching iterate(::Series{Number,Tuple{Mean{Float64,EqualWeight},Variance{Float64,EqualWeight}}})
---
### Author:  [@bernhard](https://discourse.julialang.org/u/bernhard)
#### Post date: [December 5, 2019, 12:09pm UTC](https://discourse.julialang.org/t/retrieve-onlinestat-series-statistics/31901/5 "2019-12-05T12:09:56Z")
Indeed.
I think your approach is ok. consider the `dump` function which can be helpful.
```julia
using OnlineStats
y = rand(1000)
o = fit!(Variance(), y)
@show var(o)
@show std(o)
@show mean(o)
s = Series(Mean(), Variance())
fit!(s, y)
@show var(s.stats[2])
@show std(s.stats[2])
@show mean(s.stats[2])
value(s.stats[2])
value(s.stats[1])
dump(s)
dump(o)
```
---
### Author:  [@joshday](https://discourse.julialang.org/u/joshday)
#### Post date: [December 6, 2019, 2:22pm UTC](https://discourse.julialang.org/t/retrieve-onlinestat-series-statistics/31901/6 "2019-12-06T14:22:23Z")
> [@Dario\_Sarra](#):
>
> std(things.stats[2])
That’s probably the most correct way to do this. I don’t think adding a getter function e.g. `stats(s)` would be worth it.
Alternatively, you can give `Series` a named tuple:
```julia
julia> s = Series((m=Mean(), v=Variance()));
julia> fit!(s, randn(100));
julia> s.stats.v
Variance: n=100 | value=1.08054
```