Esplorare il calcolo della potenza

Come discusso, la potenza è la probabilità di rifiutare l’ipotesi nulla quando l’ipotesi alternativa è vera. Qui esplorerai alcune proprietà della funzione di potenza e vedrai come è collegata alla dimensione del campione e ad altri parametri. La funzione get_power() è stata fornita e accetta i seguenti argomenti nel seguente ordine: n per la dimensione del campione, p1 come valore di riferimento, p2 come valore con il lift incluso e cl come livello di confidenza.

Questo esercizio fa parte del corso

Customer Analytics and A/B Testing in Python

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Istruzioni dell'esercizio

Calcola la potenza usando n = 1000 e n = 2000 in quest’ordine, insieme ai parametri già caricati p1, p2 e cl.
Usando la variabile n1 per la dimensione del campione, trova la potenza con un livello di confidenza cl = 0.8 e cl = 0.95 in quest’ordine.
Premi "Invia risposta" per confrontare i rapporti. Quale cambiamento ha un impatto maggiore: aumentare il livello di confidenza o la dimensione del campione?

Esercizio pratico interattivo

Prova a risolvere questo esercizio completando il codice di esempio.

# Look at the impact of sample size increase on power
n_param_one = get_power(n=____, p1=p1, p2=p2, cl=cl)
n_param_two = get_power(n=____, p1=____, p2=____, cl=____)

# Look at the impact of confidence level increase on power
alpha_param_one = get_power(n=n1, p1=p1, p2=p2, cl=____)
alpha_param_two = get_power(n=____, p1=____, p2=____, cl=____)
    
# Compare the ratios
print(n_param_two / n_param_one)
print(alpha_param_one / alpha_param_two)

Modifica ed esegui il codice

Questo esercizio fa parte del corso

Customer Analytics and A/B Testing in Python

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This chapter provides a brief introduction to the content that will be covered throughout the course before transitioning into a discussion of Key Performance Indicators or KPIs. You'll learn how to identify and define meaningful KPIs through a combination of critical thinking and leveraging Python tools. These techniques are all presented in a highly practical and generalizable way. Ultimately these topics serve as the core foundation for the A/B testing discussion that follows.

Exercise 1: Course introduction and overview Exercise 2: Understanding the key components of an A/B test Exercise 3: Defining meaningful KPIs Exercise 4: Identifying and understanding KPIs Exercise 5: Loading & examining our data Exercise 6: Merging on different sets of fields Exercise 7: Exploratory analysis of KPIs Exercise 8: Practicing aggregations Exercise 9: Grouping & aggregating Exercise 10: Calculating KPIs - a practical example Exercise 11: Calculating KPIs Exercise 12: Average purchase price by cohort

This chapter teaches you how to visualize, manipulate, and explore KPIs as they change over time. Through a variety of examples, you'll learn how to work with datetime objects to calculate metrics per unit time. Then we move to the techniques for how to graph different segments of data, and apply various smoothing functions to reveal hidden trends. Finally we walk through a complete example of how to pinpoint issues through exploratory data analysis of customer data. Throughout this chapter various functions are introduced and explained in a highly generalizable way.

Exercise 1: Working with time series data in pandas Exercise 2: Parsing dates Exercise 3: Creating time series graphs with Matplotlib Exercise 4: Plotting time series data Exercise 5: Pivoting our data Exercise 6: Examining the different cohorts Exercise 7: Understanding and visualizing trends Exercise 8: Seasonality and moving averages Exercise 9: Exponential rolling average & over/under smoothing Exercise 10: Events and releases Exercise 11: Visualizing user spending Exercise 12: Looking more closely at revenue

In this chapter you will dive fully into A/B testing. You will learn the mathematics and knowledge needed to design and successfully plan an A/B test from determining an experimental unit to finding how large a sample size is needed. Accompanying this will be an introduction to the functions and code needed to calculate the various quantities associated with a statistical test of this type.

Exercise 1: Introduzione all'A/B testing Exercise 2: Buone applicazioni del test A/B Exercise 3: Proprietà generali di un test A/B Exercise 4: Generalizzabilità di un A/B test Exercise 5: Progettazione iniziale di un test A/B Exercise 6: Unità sperimentali: ricavi per user-day Exercise 7: Prepararsi a eseguire un test A/B Exercise 8: Sensibilità del tasso di conversione Exercise 9: Sensibilità Exercise 10: Errore standard Exercise 11: Calcolare la dimensione del campione Exercise 12: Esplorare il calcolo della potenza

Esercizio in corso

Exercise 13: Calcolare la dimensione del campione

After running an A/B test, you must analyze the data and then effectively communicate the results. This chapter begins by interleaving the theory of statistical significance and confidence intervals with the tools you need to calculate them yourself from the data. Next we discuss how to effectively visualize and communicate these results. This chapter is the culmination of all the knowledge built over the entire course.

Exercise 1: Analyzing the A/B test results Exercise 2: Confirming our test results Exercise 3: Thinking critically about p-values Exercise 4: Understanding statistical significance Exercise 5: Intuition behind statistical significance Exercise 6: Checking for statistical significance Exercise 7: Understanding confidence intervals Exercise 8: Calculating confidence intervals Exercise 9: Interpreting your test results Exercise 10: Plotting the distribution Exercise 11: Plotting the difference distribution Exercise 12: Finale