Alabama Paradox Calculator

Enter populations and house sizes. Review clear quotas, ranks, remainders, allocations, seat gains, and losses. Spot Alabama paradox results before sharing final apportionment tables.

Calculator

Enter one group per line. Example: Group Name, Population.

Example Data Table

Group Population Original Seats Increased Seats Expected Use
North District 864 24 25 Shows a seat increase test
Central District 203 24 25 Can reveal a paradox loss
South District 932 24 25 Compares quota movement

Formula Used

The calculator uses Hamilton apportionment, also called the largest remainder method. First, it finds the standard divisor.

Standard divisor = Total population / Total seats

Next, it calculates each quota.

Quota = Group population / Standard divisor

The lower quota is the whole number part of the quota. Remaining seats go to groups with the largest fractional remainders. The Alabama paradox appears when a group receives fewer seats after the total number of seats increases.

How To Use This Calculator

  1. Enter each group name and population on a separate line.
  2. Set the original total seat count.
  3. Set the larger seat count for comparison.
  4. Choose a delimiter and tie rule.
  5. Press Calculate to view quotas, remainders, and changes.
  6. Use CSV or PDF buttons to save the result.

Understanding Alabama Paradox Testing

An Alabama paradox calculator studies a surprising apportionment problem. A group may lose a seat after the total number of seats grows. That result feels unfair because more seats should usually help, or at least not hurt, any participant. The effect is linked to Hamilton apportionment. This method uses quotas, lower quotas, and fractional remainders.

Why The Paradox Matters

Apportionment appears in legislatures, committees, budget shares, school boards, districts, and weighted representation plans. A small rounding rule can change final seats. The Alabama paradox shows why a simple largest remainder method can behave in an unexpected way. It does not mean the arithmetic is wrong. It means the rule has a weakness when the house size changes.

What The Calculator Checks

This tool compares two Hamilton allocations. The first allocation uses the original seat total. The second allocation uses a larger total. For each group, the calculator lists population, quota, lower quota, remainder, seat count, and change. A paradox warning appears when a group has fewer seats in the larger allocation.

How The Numbers Move

When total seats increase, every quota increases. However, fractional remainders do not rise evenly. One group may move from a strong remainder rank to a weaker rank. Another group may pass it. Since leftover seats are assigned by remainder rank, the final distribution can shift sharply. That shift can remove a seat from a smaller or middle group.

Good Data Practices

Use current population figures. Keep group names clear. Check totals before sharing results. Try nearby seat counts to see whether the outcome is stable. Review tie settings when remainders are equal. Export the result for audit records. The table helps explain every step. It also helps readers see why a paradox was detected.

FAQs

What is the Alabama paradox?

It happens when a group loses a seat after the total number of seats increases under a largest remainder style apportionment method.

Which method does this calculator use?

It uses Hamilton apportionment. The method assigns lower quotas first, then gives leftover seats to the largest fractional remainders.

Can I compare any two seat totals?

Yes. Enter an original total and a larger total. The tool compares both allocations and marks any seat loss.

What format should population data use?

Enter one group per line. Use a name followed by population. You can choose comma, pipe, or tab as the delimiter.

Why does a group lose a seat?

Its quota may rise, but its fractional remainder rank can fall. Leftover seats then move to other groups.

Does the tie breaker affect results?

Only equal or nearly equal remainders are affected. Choose population, name, or input order to make tie handling clear.

What does minimum one seat mean?

That option gives every group at least one starting seat. Use it only when your apportionment rule requires guaranteed representation.

Can I download the calculation?

Yes. After calculating, use the CSV button for spreadsheet work or the PDF button for a simple report.

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