It is based on the availability of children's books at home as well as an indicator of formal childcare services attendance for children between the age of 3 and compulsory school age and ability to participate in school events that cost money for school-age children. Children aged 1-2 are assumed to be non-deprived on the second indicator, so their deprivation in the education resources dimension depends entirely on the 'books at home' indicator. Missing data on the education dimension (more precisely on the "school trips" indicator) tend to drive exclusions from the sample in these countries.2 To check if missing values are missing at random or are related to household material resources, we estimate the association between the probability of being included in the study and household income poverty, which does not suffer from missing data. Among the seven countries with more than 5 per cent cases excluded from the multidimensional child poverty estimation sample, the probability of exclusion does not vary significantly with income poverty in Ireland, Romania or the United Kingdom. This is particularly good news for Romania, with its high percentage of excluded cases.