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Altman Z-score
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Altman Z-score : ウィキペディア英語版
Altman Z-score

The Z-score formula for predicting bankruptcy was published in 1968 by Edward I. Altman, who was, at the time, an Assistant Professor of Finance at New York University. The formula may be used to predict the probability that a firm will go into bankruptcy within two years. Z-scores are used to predict corporate defaults and an easy-to-calculate control measure for the financial distress status of companies in academic studies. The Z-score uses multiple corporate income and balance sheet values to measure the financial health of a company.
==Estimation of the formula==
The Z-score is a linear combination of four or five common business ratios, weighted by coefficients. The coefficients were estimated by identifying a set of firms which had declared bankruptcy and then collecting a matched sample of firms which had survived, with matching by industry and approximate size (assets).
Altman applied the statistical method of discriminant analysis to a dataset of publicly held manufacturers. The estimation was originally based on data from publicly held manufacturers, but has since been re-estimated based on other datasets for private manufacturing, non-manufacturing and service companies.
The original data sample consisted of 66 firms, half of which had filed for bankruptcy under Chapter 7. All businesses in the database were manufacturers, and small firms with assets of < $1 million were eliminated.
The original Z-score formula was as follows:〔realequityresearch.dk/Documents/Z-Score_Altman_1968.pdf〕
: Z = 1.2X1 + 1.4X2 + 3.3X3 + 0.6X4 + 0.99X5.
: X1 = Working Capital / Total Assets. Measures liquid assets in relation to the size of the company.
: X2 = Retained Earnings / Total Assets. Measures profitability that reflects the company's age and earning power.
: X3 = Earnings Before Interest and Taxes / Total Assets. Measures operating efficiency apart from tax and leveraging factors. It recognizes operating earnings as being important to long-term viability.
: X4 = Market Value of Equity / Book Value of Total Liabilities. Adds market dimension that can show up security price fluctuation as a possible red flag.
: X5 = Sales / Total Assets. Standard measure for total asset turnover (varies greatly from industry to industry).
Altman found that the ratio profile for the bankrupt group fell at -0.25 avg, and for the non-bankrupt group at +4.48 avg.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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