methods: -quantitative

Daily experience over more than a decade with designing, implementing and analysing statistical research. Data collection methods included large-scale surveys using online and offline questionnaires and interviews as well mobile data collection (CAPI), SMS surveys and Interactive Voice Response (automated telephone surveys). Skilled in sample design and tool development. Excellent knowledge of R and SPSS. Experience with a full range of analyses – multivariate modelling, mixed-effects models, structural equation modelling, IRT, etc. Skilled in automating statistical analysis via the R language, SPSS syntax, macros and scripts. Expertise in sample design, impact evaluations, “big-data” approaches, multivariate and (social) network analysis and data visualisation. Use of Geographical Information Systems (GIS) to provide location-aware research and evaluation. Also skilled in data visualisation, mainly using ggplot^[] .