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- Formula for Number of Unique Categories in Column

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Apr 19, 2017 1:53 PM
(447 views)

I am looking for the column formula to provide me with the count of unique categories in a column (maybe based on another columns categories). For instance, if a column has

A

A

B

B

B

C

then I would like to get back the value 3.

Thanks

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Apr 19, 2017 2:08 PM
(774 views)

Solution

Try this formula.......of course, swap out the :Flow for the column you want to count the categories for

```
Summarize( x = by( :FLOW ) );
N Items( x );
```

If the data table is really large, you may want to use this more efficient version

```
If( Row() == 1,
Summarize( x = by( :Flow ) );
y = N Items( x );
);
y;
```

Jim

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Apr 19, 2017 1:55 PM
(445 views)

I think I remember the Summation formula being used for this, but my memory fails me.

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Apr 19, 2017 2:08 PM
(775 views)

Try this formula.......of course, swap out the :Flow for the column you want to count the categories for

```
Summarize( x = by( :FLOW ) );
N Items( x );
```

If the data table is really large, you may want to use this more efficient version

```
If( Row() == 1,
Summarize( x = by( :Flow ) );
y = N Items( x );
);
y;
```

Jim

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Apr 25, 2017 11:01 AM
(331 views)