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May 27, 2012 11:51 PM
(22238 views)

How do I replace Missing Values w/ '0' using JSL?

I can do this manually using 'Find and Replace All', but I need to incorporate it in a code that runs automatically everyday.

1 ACCEPTED SOLUTION

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Yet another way to do it but with a single loop (Numeric columns only).

```
dt = Current Data Table();
nc = dt << get column names( Numeric );
For( i = 1, i <= N Items( nc ), i++,
nc[i][dt << get rows where( Is Missing( nc[i][] ) )] = 0
);
```

13 REPLIES 13

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Re: How to replace Missing Values w/ '0' using JSL

Hi,

This is based on book 'Jump into scripting'. I replace all the missing values with z.

```
allCols = dt2 << Get Column Names( String );
For( i = 1, i <= N Items( allCols ), i++,
/* Loop through each row. */
For( j = 1, j <= N Rows( dt2 ), j++,
/* The IsMissing function will return a ‘1’ or true if the
value is missing. If true, cell is assigned zero. */
If( Is Missing( Column( dt2, allCols ) ),
Column( dt2, allCols ) = "z"
)
)
);
```

Hope this helps.

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Re: How to replace Missing Values w/ '0' using JSL

I would avoid using j as a looping variable because it is also a JSL function.

Function: Creates a matrix of identical values.

nrows: Number of rows in matrix. If `ncols`

is not specified, `nrows`

is also used as `ncols`

.

ncols: Number of columns in matrix.

value: The value used to populate the matrix. If `value`

is not specified, 1 is used.

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Re: How to replace Missing Values w/ '0' using JSL

This is essentially the same as exj's response but a little cleaner. It does; however, only change missing in Numeric columns.

```
dt = current data table();
for(ij = 1, ij <= NCol(dt), ij +=1,
CurCol = Column(dt, ij);
If(CurCol << get data type == "Numeric",
For Each Row(
IF(IsMissing(CurCol[]), CurCol[] = 0)
);
);
);
```

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Yet another way to do it but with a single loop (Numeric columns only).

```
dt = Current Data Table();
nc = dt << get column names( Numeric );
For( i = 1, i <= N Items( nc ), i++,
nc[i][dt << get rows where( Is Missing( nc[i][] ) )] = 0
);
```

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Re: How to replace Missing Values w/ '0' using JSL

thanks everone!

cheers!

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Re: How to replace Missing Values w/ '0' using JSL

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Re: How to replace Missing Values w/ '0' using JSL

While what you say is true, it makes assumptions about the data. For example, maybe his data isn't continuous? Sometimes 0 isn't recorded and instead left as missing. If someone were to try and do a Oneway analysis using 0 as false and 1 as true they'd have a problem if their zero's ended up displaying as missing, since Oneway analysis ignores missing rows in JMP. They'd end up with ONLY ONE category!

There are other reasons 0 could show up as missing. Usually storing 0 in a large database is a waste of space. Since Pokemon Go is big right now, I'll use it as an example. I might want to record all the pokemon I caught in a day, 12 ratattas and 6 pidgeys. I wouldn't however, want to then store 0 for the other 148 pokemon I didn't catch that day. If I did I'd quickly fill up my database with useless information. Thus, if I queried my data I'd get missing for most of my pokemon at any given time, but missing is = to 0.

In similar situations you could get missing data that are equivalent to 0 b/c of data conversion issues, poorly designed queries, ect.

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Re: How to replace Missing Values w/ '0' using JSL

*can* do something in JMP doesn't always mean we *should*.

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Re: How to replace Missing Values w/ '0' using JSL

Absolutely, I appreciate the word of caution. I for sure, didn't think about it.

It's also important to remember that missing data can be valuable data, and sometimes it's best to leave it as is!