We present a method to characterize the noise in ground-based
    gravitational-wave observatories such as the Laser Gravitational-Wave
    Observatory (LIGO). This method uses linear regression algorithms such as the
    least absolute shrinkage and selection operator (LASSO) to identify noise
    sources and analyzes the detector output versus noise witness sensors to
    quantify the coupling of such noise. Our method can be implemented with
    currently available resources at LIGO, which avoids extra coding or direct
    experimentation at the LIGO sites. We present two examples to validate and
    estimate the coupling of elevated ground motion at frequencies below 10 Hz with
    noise in the detector output.

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