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# Serial Differencing Aggregation > More info about serial differencing aggregation is in the [official elasticsearch docs][1] Serial differencing is a technique where values in a time series are subtracted from itself at different time lags or periods ## Simple example ```JSON { "aggs": { "my_date_histo": { "date_histogram": { "field": "timestamp", "interval": "day" }, "aggs": { "the_sum": { "sum": { "field": "lemmings" } }, "thirtieth_difference": { "serial_diff": { "buckets_path": "the_sum", "lag" : 30 } } } } } } ``` And now the query via DSL: ```php $search = new Search(); $dateAggregation = new DateHistogramAggregation('my_date_histo', 'timestamp', 'day'); $dateAggregation->addAggregation( new SumAggregation('the_sum', 'lemmings') ); $diffAggregation = new SerialDifferencingAggregation('thirtieth_difference', 'the_sum'); $diffAggregation->addParameter('lag', 30); $dateAggregation->addAggregation($diffAggregation); $search->addAggregation($dateAggregation); $aggArray = $search->toArray(); ``` [1]: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-pipeline-serialdiff-aggregation.html
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