估计转移概率

估计信用质量的变化，根据信用评级数据建立转移概率模型

转移概率提供了一种方法来表征债权人（通常是公司）过去的信用质量变化，也是许多风险管理应用程序的基本输入。Financial Toolbox™ 使用 transprob 和相关函数基于同期和久期（也称为风险率或强度）方法来估计转移概率。

函数

`transprob`	Estimate transition probabilities from credit ratings data
`transprobbytotals`	Estimate transition probabilities using `totals` structure input
`transprobgrouptotals`	Aggregate credit ratings information into fewer rating categories
`transprobprep`	Preprocess credit ratings data to estimate transition probabilities

Estimation of Transition Probabilities
Use estimation transition probabilities to evaluate credit migration histories.
Visualize Transitions Data for transprob
This example shows how to visualize credit rating transitions that are used as an input to the transprob function.
Credit Quality Thresholds
Use transition probabilities by transforming them into credit quality thresholds.
Credit Rating by Bagging Decision Trees
This example shows how to build an automated credit rating tool.
Forecasting Corporate Default Rates
This example shows how to build a forecasting model for corporate default rates.