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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.sidebar.write("""\n\nDeveloped by Edoardo Bianchi""") | |
| 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() | |