Abstract: The present invention relates to a method and apparatus for determining correlations between text or text-derived data and numerical data. Specifically the present invention relates to determining correlation(s) between text-derived and numerical data in order to generate estimated numerical data using the determined correlation(s) for specific text-derived data. Aspects and/or embodiments seek to provide a method for estimating numerical data using historical numerical data and historical text-derived data. Aspects and/or embodiments also seek to determine a correlation between the historical numerical data and historical text-derived data for use in generating the estimated numerical data using text-derived data, optionally to identify relevant trends in text-derived data that can be used to generate estimated/predicted numerical data, and optionally in order to train a computer implemented model to generate estimates of numerical data for given text-derived data.