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Altman's Z-score: a
Precursor to Modern
Default Modeling
Vivek Jha
July 25, 2014
Presentation Overview
2Jha
Default Modeling
3Jha
Models through the years
Some popular modern models:
1. Merton Risk Model (D-D model)
2. Logistic Regression
3. Survival Analysis
4Jha
Presentation Overview
5Jha
Ratio Analysis Review
6Jha
Altman’s Original Model (1968)
7Jha
Linear Discriminant Analysis (LDA)
• LDA is a statistical technique used to classify an observation into 1 of
several a priori categorical groups given characteristics vector.
• Common assumptions: X1,…,Xn are normally distributed,
homoscedasticity, identical class covariances
Procedure:
1. Establish group classifications.
2. Collect data for objects in groups.
3. Discriminant coefficient vector determined by “best” maximizing
discrimination between groups.
8Jha
Discriminant Function Strength
9Jha
Discriminant Function Properties
10Jha
Presentation Overview
11Jha
Results 2 Years prior to Bankruptcy
12Jha
Long-Range Predictive Accuracy
13Jha
20406080
100
CorrectClassificationofBankruptSample(%)
1 2 3 4 5
Years until Bankruptcy
Predictive Power of Altman Z-Score
Robustness through the ages
 Original model surveyed only public manufacturing
firms.
 Subsequent models estimated coefficient vectors and
new characteristic vectors for private/non-
manufacturing firms as well (Z’ and Z” respectively).
 From 1968-1999 model was approximately 80-90%
accurate in predicting bankruptcy 1 year before
event.
 Type II error was approximately 15-20%.
14Jha
Presentation Overview
15Jha
Disadvantages
While seemingly effective, Altman’s Z-score has its downsides:
1. Not effective for financial firms.
2. Not significant after 2 years.
3. Financial ratio analysis often fails normality assumption.
4. Cut-offs for groups may alter within a particular industry.
16Jha
Final Remarks
 Altman’s Z-score provides a simple
model to judge financial health.
 Great for an initial guess!
 Popularized discriminant analysis in
the business field.
 Sparked insight into more powerful
statistical financial tools.
17Jha
References
1. Altman, E. I. Financial Ratios, Discriminant Analysis and the Prediction of
Corporate Bankruptcy. The Journal of Finance, 23, 589-609.
2. Altman, E. PREDICTING FINANCIAL DISTRESS OF COMPANIES:
REVISITING THE Z-SCORE AND ZETA® MODELS . Journal of Finance, 578-
585.
3. Burns, W. (2003). Discriminant Analysis. Applied Statistical Methods ().
4. Waide, J. (Director) (2006, January 25). Discriminant Analysis. Lecture.
Lecture conducted from , Innsbruck.
18Jha

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Econometric Default Modeling using Linear Discriminant Analysis