Scan language for close in top half of todays range?

and [ close > low + [range * .5] ]

If you add half the day's range to the low, it gives you the midpoint of the range. If the close is greater than the midpoint, it's in the top half of the range.

If you want it in the top quarter of the days range, the change .5 to .75, in the top 10%, change .5 to .9, etc.

Conversely if you want something at lower end of the range, change > to <, and adjust the decimal fractions accordingly

and [ close < low + [range * .5] ] // bottom half

and [ close < low + [range * .25] ] // bottom quarter

and [ close < low + [range * .1] ] // bottom 10%