We introduced missing entries in the (in reality, fully observed) COF-adsorption-property matrix by (uniform) randomly selecting entries to ablate. In practice, however, (i) some properties are more commonly measured than others, (ii) some materials are more commonly studied than others owing to e.g. ease of synthesis, and (iii) there are likely correlations between and temporal trends with the binary random variables that represent whether the (material, property) values are observed. To expand on (iii), for example, a material with a superior (inferior) value of a desired property may become popular (unpopular) for measurements of other properties. Future work entails (a) creating a model for the selection bias in selecting materials for measurements of properties and (b) accounting for the selection bias in the recommendation system .