Okama 1.4.1

Okama 1.4.1 adds custom exceptions for time period and Student's t distribution for Monte-Carlo methods in Portfolio and AssetList.

New features

Custom exceptions for time periods issues

• ShortPeriodLengthError is raised when an asset has less then 3 months of history in AssetList, Portfolio and EfficentFrontier classes
• RollingWindowLengthBelowOneYearError is raised when rolling windows size is below one year
• LongRollingWindowLengthError is raised when rolling window size is more than data history depth

Student's t distribution in Monte-Carlo methods

• set distr="t" in methods like Portfolio.dcf.monte_carlo_wealth or AssetList.kstest

Changes in existing methods & properties

• Portfolio.dcf.monte_carlo_wealth uses initial_amount value by default.

Bugs fixed

• wrong formula for 0 period rate of return in helpers.Rebalance.return_ror_ts