IBPS Normalisation Formula 2025, Check Method of Calculating Equipercentile Equating

IBPS Normalisation Process 2025: When IBPS conducts an exam in multiple sessions, it adjusts the scores of the applicants based on the difficulty level of the question paper. This happens because the difficulty level of question papers of different sessions varies. To ensure fairness in multi-session exams like those for banking, the Institute of Banking Personnel Selection (IBPS) uses a method called equipercentile equating. Since different sessions have unique question papers, their difficulty levels can vary. This IBPS Normalisation statistical process converts your raw score to an equated score by aligning percentile ranks across all sessions.

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What is IBPS Equipercentile Equating or IBPS Normalisation?

IBPS Equipercentile Equating is a statistical technique used to normalize scores of candidates appearing in different shifts of the exam. It ensures fairness by adjusting scores based on the percentile ranks secured by candidates in their respective shifts. The IBPS PO prelims and mains exams are conducted in multiple shifts with varying difficulty levels. Normalization helps in balancing the scores measured on different scales (difficulty level of different shifts) to a common scale.

IBPS Normalization Formula

The method is based on cumulative distribution functions (CDFs). The equipercentile equivalent score (Ye​) for a given score (X) from Test Form A is determined by the formula:

Y_e​=FY⁻¹​(F_x​(X))

Where:

• X is the raw score from Test Form A.
• Y is the raw score from Test Form B.
• F_x​(x) and F_y​(y) are the cumulative distribution functions for scores of Test A and Test B, respectively.
• FY⁻¹​ is the inverse of the CDF of Test Form B.

This formula ensures that a score and its equated score represent the same percentile rank in their respective distributions.

IBPS Exam Score Normalization Equipercentile Equating Method

IBPS uses the equipercentile equating method for score normalization to ensure fairness when exams are held in multiple shifts with varying difficulty levels. In this method, candidates’ raw scores are converted to a standardized score by comparing the percentile rank across different shifts. For example, if a candidate’s raw score in an easier shift corresponds to the 80th percentile, the equivalent score is mapped to the raw score that matches the 80th percentile in a tougher shift. This technique aligns scores on a common scale, ensuring that no candidate is disadvantaged due to differences in question paper difficulty.

IBPS Normalisation Formula: Example of Equating

If a score of 50 on Test A corresponds to the 85th percentile, the method finds the score on Test B that also corresponds to the 85th percentile. If that score is 51, then a raw score of 50 on Test A is considered equivalent to an equated score of 51 on Test B.

For more details, you can check the PDF below.

IBPS PO Normalisation

The IBPS PO normalization process adjusts scores across different exam shifts to ensure fairness, as difficulty levels may vary. It uses a statistical formula to equalize scores based on the average and standard deviation of each shift.

IBPS Clerk Normalisation

The IBPS Clerk exam normalization process ensures fair scoring by adjusting for difficulty variations across all shifts. It uses a statistical formula to equalize scores, considering:

1. Shift Difficulty – Adjusts marks based on the relative difficulty of each shift.
2. Mean & SD – Compares the average (mean) and spread (standard deviation) of scores across shifts.
3. Percentile Alignment – Ensures candidates are judged on their performance relative to peers.

The final normalized score reflects a candidate’s performance uniformly, regardless of shift difficulty. IBPS does not disclose the exact formula but assures fairness in the process.

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IBPS Normalization Process 2025: FAQ