# Using Spigot to sample your dataset
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To test the transformations performed by your job, you might want to get a sample of the data to check that the transformation works as intended. The *Spigot* transform writes a subset of records from the dataset to a JSON file in an Amazon S3 bucket. The data sampling method can be either a specific number of records from the beginning of the file or a probability factor used to pick records.

**To add a Spigot transform node to your job diagram**

1. (Optional) Open the Resource panel and then choose **Spigot** to add a new transform to your job diagram, if needed. 

1. On the **Node properties** tab, enter a name for the node in the job diagram. If a node parent is not already selected, then choose a node from the **Node parents** list to use as the input source for the transform.

1. Choose the **Transform** tab in the node details panel.

1. Enter an Amazon S3 path or choose **Browse S3** to choose a location in Amazon S3. This is the location where the job writes the JSON file that contains the data sample.

1. Enter information for the sampling method. You can specify a value for **Number of records** to write starting from the beginning of the dataset and a **Probability threshold** (entered as a decimal value with a maximum value of 1) of picking any given record. 

   For example, to write the first 50 records from the dataset, you would set **Number of records** to 50 and **Probability threshold** to 1 (100%).