Altmans Z Score Model
Academicians and practitioners from all over the world have been tried very hard to come up with a model which would help them to predict bankruptcy in a firm before it occurred.
In the previous article, we have already studied how the expected default frequency model was used and what its advantages and limitations were. However, it is not the only model which is used by firms to gauge how far other firms are from bankruptcy.
The Altmans Z score model has been used extensively over the years. In this article, we will have a closer look at how the Z score model came into existence and how it can help predict bankruptcy over the long run.
History Behind the Altmans Z Score Model
The Altmans Z score model was developed by an American professor and researcher at the Stern University in 1968. However, it would be unfair to say that Altmans Z score model was indigenously built by Professor Altman. Instead, it was a result of improvements over many such previous models which were developed earlier.
The idea of predicting bankruptcy shot to prominence during the 1930s. This is because of the Great Depression when hundreds of companies went bankrupt and many times endangered the financial viability of the banks and investors that lent money to them.
Over the years, many statisticians developed models to try and predict bankruptcy using financial ratios of bankrupt companies as data points. However, most of them failed. Professor Altman was able to finally devise a model which gave accurate results. Hence, the model was named after him.
The beauty of Professor Altmans model is that it is very simple. Earlier, Dr. Altman had decided that the Z score formula should use 22 ratios. However, over time, he realized that the results were almost the same even if 5 ratios were used instead of 22. Hence, the final Altmans Z score is a score that is derived using a weighted average of 5 ratios.
The coefficients which are assigned to the different ratios in this formula have been derived by running rigorous statistical procedures on the data derived from bankrupt firms. Data was derived from firms that went bankrupt and which didnt go bankrupt. The data was analyzed over different periods of time. This helped isolate the five key ratios and their coefficients which now form a part of Altmans Z score model.
The Altmans Z score is known for being extremely accurate. During the earlier years, when this score was launched, it had an accuracy of 72% in predicting default before it actually occurred. However, over the years, the accuracy rate has increased and now the score has a 90% accuracy rate when it comes to predicting bankruptcy.
The Three Levels in The Z Score
The Z score is a score that is calculated based on the formula provided by Professor Altman. After the scores are calculated, companies are categorized into one of the three grades.
The safe, grey, and distress zones are defined based on the industry. Hence, sharing their absolute values here is not meaningful.
Limitations of The Altmans Model
Altmans model has some limitations. However, since this model is quite old, steps have been taken to mitigate these limitations as well.
The bottom line is that the Altmans Z score is a valuable model which can be used to find out the creditworthiness of another firm. It has been used for decades to manage exposure and reduce the probability of credit loss. However, it cannot be used alone. It needs to be used in conjunction with other models in order to ensure that the right decision has been taken.
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