Create app.py

app.py

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+import streamlit as st
+import math
+
+# Define the conversion table from French to Ewbank grades
+french_to_ewbank = {
+    '4a/4a+': 13, '4b/4b+': 14, '4c/4c+': 15,
+    '5a': 15.5, '5a+/5b': 16, '5b+': 17, '5c': 17.5, 
+    '5c+/6a': 18, '6a+': 19,
+    '6b': 20, '6b+': 21, '6c': 21.5, '6c+': 22.5, 
+    '7a': 23, '7a+': 24, '7b': 25, '7b+': 26,
+    '7c': 27, '7c+': 28, '8a': 29, '8a+': 30,
+    '8b': 31, '8b+': 32, '8c': 33, '9a': 35,
+    '9b': 37, '9c': 39
+}
+
+# Function to convert French grades to Ewbank grades
+def convert_french_to_ewbank(french_grade):
+    return french_to_ewbank.get(french_grade, None)
+
+# Function to calculate the probability of success
+def calculate_probability_of_success(current_grade_ewbank, route_grade_ewbank, m_parameter):
+    probability_success = 1 / (math.exp(m_parameter * (route_grade_ewbank - current_grade_ewbank)) + 1)
+    expected_attempts = (1 - probability_success) / probability_success
+    return probability_success, expected_attempts
+
+# Streamlit app
+def main():
+    st.title("Climbing Grade Success Estimator")
+
+    # Sidebar for references
+    st.sidebar.header("How it works?")
+    st.sidebar.write("""Based on the work presented in the paper 'Bayesian inference of the climbing grade scale' available on [ArXiv](https://arxiv.org/abs/2111.08140)""")
+    
+    st.sidebar.write("""\n\n [Here you can find a table for grade conversion](https://www.thecrag.com/en/article/grades)""")
+    
+    st.sidebar.header("\n\nOriginal Paper Citation:")
+    st.sidebar.text("""
+@misc{drummond2021bayesian,
+    title={Bayesian inference of the climbing grade scale}, 
+    author={Alexei Drummond and Alex Popinga},
+    year={2021},
+    eprint={2111.08140},
+    archivePrefix={arXiv},
+    primaryClass={stat.AP}
+}
+""")
+
+    st.write("Select your current climbing grade and the grade of the route you plan to climb. Grades are expressed following the French system.")
+    current_grade_french = st.selectbox("Climber's Current Grade (French)", options=list(french_to_ewbank.keys()))
+    route_grade_french = st.selectbox("Route Grade (French)", options=list(french_to_ewbank.keys()))
+    m_parameter = 0.85  # Slope parameter from the paper for Ewbank scale
+
+    if st.button("Estimate Probability"):
+        current_grade_ewbank = convert_french_to_ewbank(current_grade_french)
+        route_grade_ewbank = convert_french_to_ewbank(route_grade_french)
+        probability, attempts = calculate_probability_of_success(current_grade_ewbank, route_grade_ewbank, m_parameter)
+        st.success(f"Probability of Success: {probability*100:.2f}%")
+        st.success(f"Expected Number of Attempts: {attempts:.2f}")
+
+if __name__ == "__main__":
+    main()