Can you provide a formula for writing a condition for xxxsuccessive volume down days, followed by a volume up day? Thanks

No, I can't write a Personal Criteria Formula for this without a fixed number of days being specified. For example if it were one bar where volume was down followed by one bar where volume was up, it would be:

V > V1 AND V1 < V2

But if it were two bars where volume was down followed by one bar where volume was up, it would be:

V > V1 AND V1 < V2 AND V2 < V3

The pattern would continue as you added more bars where volume was down.

PCF Formula Descriptions
Handy PCF example formulas to help you learn the syntax of PCFs!

Say that I want to know if today's up-volume is higher than any down-volume day over the past 10 trading days, and conversely if today's down-volume is higher than any up-volume day over the past 10 trading days.

A formula for a Pocket Pivot could be written as:

C > C1 AND V > ABS(C1 < C2) * V1 AND V > ABS(C2 < C3) * V2 AND V > ABS(C3 < C4) * V3 AND V > ABS(C4 < C5) * V4 AND V > ABS(C5 < C6) * V5 AND V > ABS(C6 < C7) * V6 AND V > ABS(C7 < C8) * V7 AND V > ABS(C8 < C9) * V8 AND V > ABS(C9 < C10) * V9 AND V > ABS(C10 < C11) * V10

And a formula for a Reversed Pocket Pivot could be written as:

C < C1 AND V < ABS(C1 > C2) * V1 AND V < ABS(C2 > C3) * V2 AND V < ABS(C3 > C4) * V3 AND V < ABS(C4 > C5) * V4 AND V < ABS(C5 > C6) * V5 AND V < ABS(C6 > C7) * V6 AND V < ABS(C7 > C8) * V7 AND V < ABS(C8 > C9) * V8 AND V < ABS(C9 > C10) * V9 AND V < ABS(C10 > C11) * V10

Thank you very much!

You're welcome.