# BLS survey `ml`

Source: U.S. Bureau of Labor Statistics, LABSTAT time-series database (https://download.bls.gov/pub/time.series/ml/). Public domain U.S. government data. Credit: U.S. Bureau of Labor Statistics.

Survey documentation: `ml.txt`.

`*_series.parquet` defines each series_id (labels); `*_data_*.parquet` holds series_id, year, period (M01-M12 monthly, Q0x quarterly, A01/M13 annual), value, footnote_codes; other files map codes to labels.

| file | rows | columns |
|---|---|---|
| ml.contacts | 2 | Mass Layoff Statistics Contacts |
| ml.data.1.AllData | 6187768 | series_id, year, period, value, footnote_codes |
| ml.dataelement | 3 | 003, Layoff events |
| ml.dataseries | 1 | M, Mass Layoff |
| ml.footnote | 12 | footnote_code, footnote_text |
| ml.industrybase | 1 | N, Industry data from 1995 to present (NAICS) |
| ml.irc | 266 | irc_code, irc_text, display_level, selectable, sort_sequence |
| ml.period | 17 | Q01, QTR1, 1st Quarter |
| ml.series | 62423 | series_id, dataseries_code, srd_code, industryb_code, irc_code, dataelement_code, footnote_codes, begin_year, begin_period, end_year, end_period |
| ml.srd | 65 | D10, Northeast, 0, T, 54 |