The data on Cuba comes from Cuban army registers and measures the heights of recruits between 1902 and 1951. Linda Twrdek (2010) collected the dataset from the national archive of Cuba. The earliest third of the data was collected in feet. Twrdek found out that the English foot measure was used for recording heights in this early phase, thereafter centimetres are used. There is a minimum height requirement applied to enlisted recruits, hence truncated regression is necessary. The minimum height requirement was 162.56 cm for the early period, until 1913. The selection process into the army beyond the minimum height requirement are not perfectly clear, although Twrdek found that there is evidence that the recruits share characteristics of the general population, as represented in national censuses; speaking for broad representativeness. For example, the ethnic composition was similar. Moreover, the skill levels of the occupations recorded between the two groups are broadly similar, though only some occupations were systematically compared to census data. Regional selectivity is less of a problem, as both provinces of western and eastern Cuba are included. Occupations in the dataset are not individual occupations, but Armstrong skill categories, which have been developed for 19th century censuses (this classification is explained in Twrdek 2010). The birth decades covered with a reasonable number of cases are the 1870s to the 1900s.