binary biography categorical child development computational contact criminal careers critique data retention datasets desistance destinations developmental change e-Learning education escalation ESRC fax funders grant number investigators latent class analysis latent transition analysis length lifestyles lifetime data likelihood longitudinal longitudinal data analysis Longitudinal study of Young People in England meeting microgenetics missing data mixed models Murray Aitkin node ordinal paired comparisons patterns people phase 1 phone preference psychology quantitative Random effects ranked data report researchers risk serious offences short course sociology specialisation statistical modelling support Survival analysis training materials transition workshop