net.simplace.sim.components.experimental.lifestock.LifeStockFunctions

public static double HfromP(double p, double p2);

Calculate hazard rate from probabilities

• p probability
• p2 concurrent probability

returns hazard rate

public static double PfromH(double h, double h2);

Calculate probability from hazard rates

• h hazard rate
• h2 concurrent hazard rate

returns probability

public static double HfromPOld(double po, double pd);

Estimates offtake hazard rate approximately from offtake and death probability ho and hd are dependent on po and ph, and therefore an equation system has to be solved. This method estimates hd by ignoring po and uses it to calculate ho by a root finding algorithm.

• po offtake probability
• pd death probability

returns offtake hazard rate

public static double PRescaled(double p, double p2, double n);

Rescales probability to different time unit

• p probability
• p2 concurrent probability
• n steps

returns rescaled probability

public static double surv(double pd, double po);

Calculates survive probability

• pd death probability
• po offtake probability

returns survive probability

public static double gamma(double surv, double d);

Calculates the transition probability from one age class to the next one

• surv survive probability
• d duration of ageclass in timeunits

returns transition probability

public static HashMap calculatePopulationRates(Double[] state, Double[]
pdeath, Double[] pofftake, Double[] duration, Double[] intake, Double[]
aMax, Double prol, Double parturition, Double femaleproportion, int n);

Rate function for livestock

• state array of actual states [animal]
• pdeath array of death probabilities on yearly base [-]
• pofftake array of death probabilities on yearly base [-]
• duration array of age class durations [year]
• intake array of yearly intake [animal day-1]
• aMax array of maximal animal number [animal]
• prol prolification rate [-]
• parturition parturition rate [year-1]
• femaleproportion proportion of females at birth [-]
• n number of time steps per year [-]

returns hashmap containing the arrays with overall change rate dRate, dBirth, dDeath, dIntake, dOfftake [animal day-1], as well as Balance array with total, female and male balance

public static HashMap calculatePopulationRatesExcelCompatible(Double[] state,
Double[] pdeath, Double[] pofftake, Double[] duration, Double[] intake,
Double[] aMax, Double prol, Double parturition, Double femaleproportion,
int n);

Rate function for livestock (compatibility mode) Perform same calculation as in the Excel version. Differences are - sligthtly inaccurate rescaling of probabilities - calculating birth rates from next step's rate - estimate next step's rate to limit to maximal values The effect of using premature states for some rate calculations becomes negligible when calculating with higher timesteps (e.g. daily)

• state array of actual states [animal]
• pdeath array of death probabilities on yearly base [-]
• pofftake array of death probabilities on yearly base [-]
• duration array of age class durations [year]
• intake array of yearly intake [animal day-1]
• aMax array of maximal animal number [animal]
• prol prolification rate [-]
• parturition parturition rate [year-1]
• femaleproportion proportion of females at birth [-]
• n number of time steps per year [-]

returns hashmap containing the arrays with overall change rate dRate, dBirth, dDeath, dIntake, dOfftake, dDeathNewBorn, dOfftakeNewBorn [animal day-1], as well as Balance array with total, female and male balance