# Is there a way to find nunique and nmissing values for an integer column?

**URL:** <https://discourse.julialang.org/t/is-there-a-way-to-find-nunique-and-nmissing-values-for-an-integer-column/43721>\
**Category:** General Usage\
**Tags:** question, package\
**Created:** [July 26, 2020, 8:09pm UTC](https://discourse.julialang.org/t/is-there-a-way-to-find-nunique-and-nmissing-values-for-an-integer-column/43721 "2020-07-26T20:09:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Mrinalini\_madhusudan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mrinalini_madhusudan/32/16492_2.png) [@Mrinalini\_madhusudan](https://discourse.julialang.org/u/Mrinalini_madhusudan)\
**Post date:** [July 26, 2020, 8:09pm UTC](https://discourse.julialang.org/t/is-there-a-way-to-find-nunique-and-nmissing-values-for-an-integer-column/43721/1 "2020-07-26T20:09:07Z")

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I understand computing metrics like nmissing and nunique in describe() is avoided to save the performance issue. But is there any other way that these metrics can be computed?

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**Author:** ![dlakelan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/dlakelan/32/8491_2.png) [@dlakelan](https://discourse.julialang.org/u/dlakelan)\
**Post date:** [July 26, 2020, 8:27pm UTC](https://discourse.julialang.org/t/is-there-a-way-to-find-nunique-and-nmissing-values-for-an-integer-column/43721/2 "2020-07-26T20:27:24Z")

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```julia
length(unique(A.mycol))
length(filter(ismissing,A.mycol))

```

?

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**Author:** ![Mrinalini\_madhusudan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mrinalini_madhusudan/32/16492_2.png) [@Mrinalini\_madhusudan](https://discourse.julialang.org/u/Mrinalini_madhusudan)\
**Post date:** [July 27, 2020, 7:18am UTC](https://discourse.julialang.org/t/is-there-a-way-to-find-nunique-and-nmissing-values-for-an-integer-column/43721/3 "2020-07-27T07:18:02Z")

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> [@dlakelan](#):
>
> `unique`

@dlakelan i get the error stating

```julia
MethodError: objects of type DataFrame are not callable

Stacktrace:
 [1] top-level scope at In[283]:1

```

when i try to pass a dataframe’s column here. How do i resolve this?  
Thanks in Advance

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<div class="post-metadata">

**Author:** ![Mrinalini\_madhusudan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mrinalini_madhusudan/32/16492_2.png) [@Mrinalini\_madhusudan](https://discourse.julialang.org/u/Mrinalini_madhusudan)\
**Post date:** [July 27, 2020, 7:20am UTC](https://discourse.julialang.org/t/is-there-a-way-to-find-nunique-and-nmissing-values-for-an-integer-column/43721/4 "2020-07-27T07:20:17Z")

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@dlakelan  
Resolved, earlier i was trying to pass

> df[:colName]

Now I changed it to

> df.colName and it works .

Thanks