## standardize_indicator_id()


Fix the INDICATOR column to be uppercase and prefixed with dataset ID.


Usage

``` python
standardize_indicator_id(df)
```


Ensures all values in the `INDICATOR` column are upper case, prefixed with the dataset identifier, and have dots replaced with underscores.


## Parameters


`df: pd.DataFrame`  
The DataFrame to modify. Must contain an `INDICATOR` column and either a `DATABASE_ID` or `DATASET_ID` column.


## Returns


`pd.DataFrame`  
The modified DataFrame with corrected INDICATOR values.


## Raises


`ValueError`  
If neither a `DATABASE_ID` nor a `DATASET_ID` column is present, or if the ID column contains more than one unique value.


## Examples


``` python
    >>> df = pd.DataFrame({
    ...     "DATABASE_ID": ["WB.DATA360", "WB.DATA360"],
    ...     "INDICATOR": ["indicator.one", "indicator.two"],
    ... })
    >>> result = standardize_indicator_id(df)
    >>> list(result["INDICATOR"])
```

    ['WB_DATA360_INDICATOR_ONE', 'WB_DATA360_INDICATOR_TWO']