First arguments specified - what column you need as an output
2 argument takes the expression on which we should derive the weight of object
by default it gives in ascending order, by using "-" before your 2nd arguments , we can make it act as Descending order.
3rd argument helps you to get the desired position in sort order( Top1 , Top2nd, Top 3rd..)
Hope this helps.
CY
Below is standard explanation from QLIK
firstsortedvalue([{set_expression}][ distinct ] [ total [<fld {, fld}>]] expression [, sort_weight [, n]])
returns the first value of expression sorted by corresponding sort-weight when expression is iterated over the chart dimension(s). Sort-weight should return a numeric value where the lowest value will render the corresponding value of expression to be sorted first. By preceding the sort-value expression with a minus sign, the function will return the last value instead. If more than one value of expression share the same lowest sort-order, the function will return null. By stating an n larger than 1, you will get the nth value in order.
Examples:
firstsortedvalue ( PurchasedArticle, OrderDate )
firstsortedvalue ( PurchasedArticle, -OrderDate, 2 )
firstsortedvalue ( A/B, X*Y/3 )
firstsortedvalue ( distinct PurchasedArticle, OrderDate )
firstsortedvalue ( total PurchasedArticle, OrderDate )
firstsortedvalue ( total <Grp> PurchasedArticle, OrderDate )
