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article introduce escolex first european portuguese childrens lexical database gradeleveladjusted word frequency statistics computed 32millionword corpus escolex provides 48381 word forms extracted 171 elementary middle school textbooks 6 11yearold children attending first six grades portuguese educational system like childrens gradelevel databases eg carroll davies richman 1971 corral ferrero goikoetxea behavior research methods 41 10091017 2009 lt sprengercharolles col behavior research methods instruments computers 36 156166 2004 zeno ivens millard duvvuri 1995 escolex provides four frequency indices grade overall word frequency f index dispersion across selected textbooks estimated frequency per million words u standard frequency index sfi also provides new measure contextual diversity cd addition number letters word parts speech number syllables syllable structure adult frequencies taken ppal european portuguese corpusbased lexical database soares comesaa iriarte almeida simes costa machado 2010 soares iriarte almeida simes costa frana comesaa press provided escolex useful tool researchers interested language processing development professionals need verbal materials adjusted childrens developmental stages escolex downloaded along article httpppaldiuminhoptaboutdatabases