aq.from(pj).join( aq.from(altpj) , "time")
.derive({ ["avg_"+"Sociality_A"] : d => (d.Sociality_A_1+d.Sociality_A_2)/2 })
.derive({ ["avg_"+"Sociality_B"] : d => (d.Sociality_B_1+d.Sociality_B_2)/2 })
.select('time', 'Sociality_A_1', 'Sociality_A_2', 'Sociality_B_1', 'Sociality_B_2',
"avg_"+"Sociality_A", "avg_"+"Sociality_B")
.view(10)