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Release 8.2.2

Contents:

In the town of Circleville, citizens are allowed to maintain a single crop circle in their backyard, as long as it confirms to the town regulations. Below is some data on the size of crop circles in town, with a separate entry for each home. Limits are displayed in the adjacent columns, with the `inclusive` columns indicating whether the minimum or maximum values are inclusive.

Tip: As part of this exercise, you can see how to you can extend your recipe to perform some simple financial analysis of the data.

Source:

House155.510Y25N
House21210Y25N
House314.2510Y25N
House43.510Y25N
House52710Y25N

Transformation:

After the data is loaded into the Transformer page, you can begin comparing column values:

Transformation Name `New formula` `Single row formula` `LESSTHANEQUAL(Radius_ft,minRadius_ft)` `'tooSmall'`

While accurate, the above transform does not account for the `minInclusive` value, which may be changed as part of your steps. Instead, you can delete the previous transform and use the following, which factors in the other column:

Transformation Name `New formula` `Single row formula` `IF(minInclusive == 'Y',LESSTHANEQUAL(Radius_ft,minRadius_ft),LESSTHAN(Radius_ft,minRadius_ft))` `'tooSmall'`

In this case, the `IF` function tests whether the minimum value is inclusive (values of `10` are allowed). If so, the `LESSTHANEQUAL` function is applied. Otherwise, the `LESSTHAN` function is applied. For the maximum limit, the following step applies:

Transformation Name `New formula` `Single row formula` `IF(maxInclusive == 'Y', GREATERTHANEQUAL(Radius_ft,maxRadius_ft),GREATERTHAN(Radius_ft,maxRadius_ft))` `'tooBig'`

Now, you can do some analysis of this data. First, you can insert a column containing the amount of the fine per foot above the maximum or below the minimum. Before the first `derive` command, insert the following, which is the fine (`\$15.00`) for each foot above or below the limits:

Transformation Name `New formula` `Single row formula` `15` `'fineDollarsPerFt'`

At the end of the recipe, add the following new line, which calculates the fine for crop circles that are too small:

Transformation Name `New formula` `Single row formula` `IF(tooSmall == 'true', (minRadius_ft - Radius_ft) * fineDollarsPerFt, 0.0)` `'fine_Dollars'`

The above captures the too-small violations. To also capture the too-big violations, change the above to the following:

Transformation Name `New formula` `Single row formula` `IF(tooSmall == 'true', (minRadius_ft - Radius_ft) * fineDollarsPerFt, if(tooBig == 'true', (Radius_ft - maxRadius_ft) * fineDollarsPerFt, '0.0'))` `'fine_Dollars'`

In place of the original "false" expression (`0.0`), the above adds the test for the too-big values, so that all fines are included in a single column. You can reformat the `fine_Dollars` column to be in dollar format:

Transformation Name `Edit column with formula` `fine_Dollars` `NUMFORMAT(fine_Dollars, '\$###.00')`

Results:

After you delete the columns used in the calculation and move the remaining ones, you should end up with a dataset similar to the following:

Now that you have created all of the computations for generating these values, you can change values for `minRadius_ft` , `maxRadius_ft` , and `fineDollarsPerFt` to analyze the resulting fine revenue. Before or after the transform where you set the value for `fineDollarsPerFt`, you can insert something like the following:
Transformation Name `Edit column with formula` `minRadius_ft` `'12.5'`
After the step is added, select the last line in the recipe. Then, you can see how the values in the `fineDollars` column have been updated.