Figure 7
The similarity of items to the group of medals issued in 1854. The weighted squared Euclidian distance between the metal composition of each item and the median composition of all medals issued in 1854 (the medal in question being excluded from the calculation of the median composition if issued in that year). Items in the top panel are shown ranked by their distance and the colour of their points indicates the years between the year in question and the date of the medal. For comparison non-issued VCs or other items are indicated in grey. The bottom panel indicates the positive predictive value of the distance metric at predicting pre-1914 VCs (green) or medals dated 1854 (brown). This equates to the proportion of items with a distance metric of this value or less that match this era or year respectively.
