Merge pull request #315 from Vhizux/feature/condProb

Conditional probability

README.md

@@ -135,4 +135,4 @@ problem, solution = mathgen.genById(0)
 | 101 | Leap Year or Not | Year 2049  | is not a leap year | is_leap_year |
 | 102 | Minute to Hour conversion | Convert 960 minutes to Hours & Minutes | 16 hours and 0 minutes | minutes_to_hours |
 | 103 | Decimal to Binary Coded Decimal | BCD of Decimal Number 6561 is =  | 19101 | decimal_to_bcd |
-| 104 | Circumference | Circumference of circle with radius 11 | 69.14285714285714 | circumference |
+| 104 | Circumference | Circumference of circle with radius 11 | 69.14285714285714 | circumference |

mathgenerator/funcs/__init__.py

@@ -110,3 +110,4 @@ from .minutes_to_hours import *
 from .decimal_to_bcd import *
 from .circumference import *
 from .combine_like_terms import *
+from .conditional_probability import *

mathgenerator/funcs/conditionalProbability.py

@@ -0,0 +1,25 @@
+from .__init__ import *
+
+
+def conditionalProbFunc():
+    P_disease = round(2. * random.random(), 2)
+    true_positive = round(random.random() + float(random.randint(90, 99)), 2)
+    true_negative = round(random.random() + float(random.randint(90, 99)), 2)
+
+    def BayesFormula(P_disease, true_positive, true_negative):
+        P_notDisease = 100. - P_disease
+        false_positive = 100. - true_negative
+        P_plus = (P_disease) * (true_positive) + (P_notDisease) * (false_positive)
+        P_disease_plus = ((true_positive) * (100 * P_disease)) / P_plus
+
+        return P_disease_plus
+
+    problem = "Someone tested positive for a nasty disease which only {0:.2f}% of population have. " \
+              "Test sensitivity (true positive) is equal to SN= {1:.2f}% whereas test specificity (true negative) SP= {2:.2f}%. " \
+              "What is the probability that this guy really has that disease?".format(P_disease, true_positive, true_negative)
+    answer = str(round(BayesFormula(P_disease, true_positive, true_negative), 2)) + "%"
+
+    return problem, answer
+
+
+conditionalProb = Generator("Conditional Probability", 101, "P(A|+)=", "c", conditionalProbFunc)

test.py

@@ -2,13 +2,12 @@ from mathgenerator import mathgen
 
 # test your generators here
 
-print(mathgen.addition())
+# print(mathgen.addition())
 
 # prints each generator in genList
-list = mathgen.getGenList()
+# list = mathgen.getGenList()
-for item in list:
+# for item in list:
-    print(item[2])
+#     print(item[2])
 
 # print(mathgen.getGenList())
-print(mathgen.decimal_to_roman_numerals())
+print(mathgen.genById(101))
-print(mathgen.genById(105))