This is a generic template designed for use by the Journal of the Royal Statistical Society: Series A, Series B, and Series C. Please consult the journal's author guidelines in order to confirm that your manuscript complies with the journal’s requirements. When you are ready to submit your manuscript, download / export it in LaTeX, Word, or PDF format and submit your document via the submission portal. Please replace this text with your abstract.

Keywords --- keyword 1, keyword 2, keyword 3, keyword 4, keyword 5, keyword 6, keyword 7