trade-copier

name	trade-copier
description	Calculate trade copier follower ratios for NinjaTrader ATM strategy

Trade Copier Follower Calculation

Calculate trade copier ratios for NinjaTrader ATM strategy with scalp/runner split.

Rules

• Leader account (sim) is copied to multiple follower accounts
• Trade copier applies one ratio per follower (2 decimal places)
• Rounding: scalp = floor(leader_scalp × ratio), runner = ceil(leader_runner × ratio)

Input

Ask user for follower accounts: account. max_contracts, runner_contracts

1. 3, 1
2. 5, 1
3. 8, 2

Calculation

1. Leader: runner = max(all follower runners), scalp = max(all follower max_contracts) - runner
   • Constraint: scalp must be > runner. If not, increase leader total until scalp > runner.
2. Ratio per follower: ratio = max_contracts / leader_total (2 decimal places, round down)
3. Follower result: scalp = floor(leader_scalp × ratio), runner = ceil(leader_runner × ratio)
   • Constraint: scalp must be ≥ runner. If not, reduce ratio until satisfied.

Constraint

floor(leader_scalp × ratio) + ceil(leader_runner × ratio) ≤ max_contracts

If violated, reduce ratio until constraint satisfied.

Output

Account	Scalp	Runner	Total	Ratio	Within Limit?
Leader	X	Y	Z	-	-
Follower 1	A	B	C	0.XX	Yes/No

Verify

1. No account exceeds max contracts
2. Runner contracts ≥ 1 (ceiling guarantees minimum 1)
3. Scalp ≥ runner for all accounts (scalp is always the larger portion)
4. Ratios achievable with 2 decimal places