added probability module

src/statsy/Probability.py

@@ -0,0 +1,45 @@
+from .main import *
+
+def simple_probability(desired_outcomes:str,total_outcomes:str)->Number:
+    """
+    Returns the probability of a set of outcomes A out of the number of all equally likely outcomes B. \n
+    """
+    return desired_outcomes / total_outcomes
+
+def joint_probability(a:Number,b:Number)->Number:
+    """
+    Returns the joint probability of A and B where A and B are independent outcomes. \n
+    Formula: P (A and B) = P (A) X P (B) \n
+    Also known as conjunctive probability. \n
+    """
+    return a * b
+
+def bare_joint_probability(a_desired:Number,a_possible:Number,b_desired:Number,b_possible:Number)->Number:
+    """
+    Returns the joint probability of A and B where A and B are independent outcomes and P(A) and P(B) must be calculated. \n
+    Formula: P (A and B) = P (A) X P (B) \n
+    Where P(A) and P(B) are not known. \n
+    """
+    return simple_probability(a_desired,a_possible) * simple_probability(b_desired,b_possible)
+
+def disjunctive_probability(P_of_a:Number,P_of_b:Number,P_of_a_and_b:Optional[Number]=None):
+    """
+    Returns the disjunctive probability of A where A and B are independent outcomes. \n
+    Formula: P (A or B) = P (A) + P (B) - P (A and B) \n
+    Where P(A) , P(B), and P(A and B) is known.
+    """
+    jp = joint_probability(P_of_a,P_of_b)
+    if P_of_a_and_b is not None:
+        jp = P_of_a_and_b
+    return P_of_a + P_of_b - jp
+
+def bare_disjunctive_probability(a_desired:Number,a_possible:Number,b_desired:Number,b_possible:Number)->Number:
+    """
+    Returns the disjunctive probability of A where A and B are independent outcomes. \n
+    Formula: P (A or B) = P (A) + P (B) - P (A and B) \n
+    Where P(A) and P(B) are not known. \n
+    """
+    P_of_a = simple_probability(a_desired,a_possible)
+    P_of_b = simple_probability(b_desired,b_possible)
+    jp = joint_probability(P_of_a,P_of_b)
+    return P_of_a + P_of_b - jp

src/statsy/__init__.py

@@ -7,4 +7,5 @@
 from .Conversion import *
 from .Constants import *
 from .Logarithms import *
-from .Methods import *
+from .Methods import *
+from .Probability import *