{"id":45522,"date":"2023-08-08T06:10:09","date_gmt":"2023-08-08T06:10:09","guid":{"rendered":"https:\/\/analystprep.com\/cfa-level-1-exam\/?p=45522"},"modified":"2026-03-27T09:54:29","modified_gmt":"2026-03-27T09:54:29","slug":"bootstrap-resampling","status":"publish","type":"post","link":"https:\/\/analystprep.com\/cfa-level-1-exam\/quantitative-methods\/bootstrap-resampling\/","title":{"rendered":"Bootstrap Resampling"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"VideoObject\",\n  \"name\": \"Simulation Methods (2024\/2025 CFA\u00ae Level I Exam \u2013 Quantitative Methods \u2013 Learning Module 6)\",\n  \"description\": \"Master Simulation Methods for the 2024\/2025 CFA\u00ae Level I Quantitative Methods curriculum. In this lesson, Jim explains normal versus lognormal distributions, continuously compounded returns, and how Monte Carlo and Bootstrap simulations are used to model portfolio risk and return and future wealth outcomes. The session includes step-by-step volatility annualization and an exam-style example to help candidates apply simulation techniques efficiently on CFA Level I exam questions.\",\n  \"uploadDate\": \"2023-08-19T00:00:00+00:00\",\n  \"thumbnailUrl\": \"https:\/\/img.youtube.com\/vi\/qLhvORG9ITo\/default.jpg\",\n  \"contentUrl\": \"https:\/\/www.youtube.com\/watch?v=qLhvORG9ITo\",\n  \"embedUrl\": \"https:\/\/www.youtube.com\/embed\/qLhvORG9ITo\",\n  \"duration\": \"PT37M18S\"\n}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"QAPage\",\n  \"mainEntity\": {\n    \"@type\": \"Question\",\n    \"name\": \"Which of the following statements is most likely accurate in relation to bootstrap analysis?\",\n    \"text\": \"Which of the following statements is most likely accurate in relation to bootstrap analysis?\\n\\nA. Bootstrap analysis aims to deduce statistics about population parameters from a singular sample.\\nB. Bootstrap analysis involves the repeated extraction of samples of equal size, with replacement, from the initial population.\\nC. During bootstrap analysis, it is necessary for analysts to determine probability distributions for primary risk factors that govern the underlying random variables.\",\n    \"answerCount\": 3,\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"The correct answer is A.\\n\\nBootstrap analysis uses repeated random sampling from a single observed sample to infer population parameters. Even though the true population distribution is unknown, bootstrap resampling allows analysts to estimate statistics based on the information contained in the sample.\"\n    }\n  }\n}\n<\/script>\n\n\n<p><iframe loading=\"lazy\" src=\"\/\/www.youtube.com\/embed\/qLhvORG9ITo\" width=\"611\" height=\"343\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h2>Resampling<\/h2>\n<p>Resampling means repeatedly drawing samples from the original observed sample to make statistical inferences about population parameters. There are two common methods: Bootstrap and jackknife. Here, we&#8217;ll focus on the Bootstrap method.<\/p>\n<div style=\"margin: 20px 0;\"><a style=\"display: block; width: 100%; text-align: center; padding: 10px; border: 2px solid #2f5bea; border-radius: 40px; font-size: 18px; color: #2f5bea; text-decoration: none;\" href=\"https:\/\/analystprep.com\/free-trial\/\" target=\"_blank\" rel=\"noopener\"> Practice bootstrap resampling questions with our free trial. <\/a><\/div>\n<h3>Bootstrap Resampling<\/h3>\n<p>Bootstrap resampling relies on computer simulations for statistical inferences, bypassing the need for conventional analytical formulas like z-statistics. The bootstrap technique is underpinned by a strategy that mirrors the random sampling process from a population to create a sampling distribution.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"591\" height=\"444\" class=\"size-full wp-image-45524 aligncenter\" style=\"max-width: 100%;\" src=\"https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2023\/08\/LM06_IMG2.jpg\" alt=\"\" srcset=\"https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2023\/08\/LM06_IMG2.jpg 591w, https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2023\/08\/LM06_IMG2-300x225.jpg 300w, https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2023\/08\/LM06_IMG2-400x301.jpg 400w\" sizes=\"auto, (max-width: 591px) 100vw, 591px\" \/><\/p>\n<p>Note that in bootstrapping, we do not have information about the population. Our only insight comes from a sample of size \\(n\\) drawn from this \u201cunknown population.\u201d<\/p>\n<p>The core concept is that a random sample can effectively stand in for the entire population. So, we can mimic drawing samples from the population by repeatedly resampling from the initial sample. Essentially, the bootstrap method treats the initially obtained sample as a stand-in for the entire population.<\/p>\n<h3>Bootstrapping vs Monte Carlo Simulation<\/h3>\n<p>Both bootstrap and Monte Carlo simulation techniques heavily rely on repetitive sampling. Bootstrap considers the resampled dataset a proxy for the true population and infers population parameters such as mean, variance, skewness, and kurtosis from the statistical distribution of these samples.<\/p>\n<p>Conversely, Monte Carlo simulation is centered on the generation of random data with a pre-determined statistical distribution of parameter values.<\/p>\n<h3>Simulation Using Bootstrapping<\/h3>\n<p>Simulation using bootstrapping is similar to Monte Carlo Simulation except for the source of random variables. In bootstrapping, the random variables are taken from a bootstrap sample instead of a probability distribution.<\/p>\n<p>Consider the previous example:<\/p>\n<p>Let&#8217;s say an investor wants to understand the potential outcomes of investing in a portfolio with a 70-30 split between stocks and bonds over a 20-year period. Here&#8217;s how a Monte Carlo simulation could be set up.<\/p>\n<p>The simulation steps using the bootstrap sampling distribution are as follows:<\/p>\n<h4>Specifying the Simulation<\/h4>\n<p><strong>Step 1: Specify the quantity of interest in terms of underlying variables<\/strong><\/p>\n<p>The quantity of interest here could be the final portfolio value after 20 years, denoted as \\(V_{iT}\\). The underlying variable is the return on the portfolio. The starting portfolio value is $100,000, with 70% invested in stocks and 30% in bonds.<\/p>\n<p><strong>Step 2: Specify a time horizon<\/strong><\/p>\n<p>Assume we&#8217;re interested in yearly returns, so the time horizon is 20 years. Divide the calendar time into sub-periods. In this case, we will assume yearly returns so that the number of subperiods is \\(K = 20\\), and time increment \\({\\Delta t}\\) is, therefore, one year.<\/p>\n<p><strong>Step 3: Generate bootstrap samples from the empirical distribution of portfolio returns<\/strong><\/p>\n<p>Here, we use the historical return data as our empirical distribution. Instead of assuming that the annual portfolio return follows a specific theoretical distribution, we will use the bootstrap procedure to draw the \\(K=20\\) yearly returns from the observed empirical distribution.<\/p>\n<h4>Running the Simulation Over a Given Number of Trials<\/h4>\n<p><strong>Step 4: Use the bootstrap samples to produce portfolio values used to value the contingent claim<\/strong><\/p>\n<p>This step involves using the bootstrap samples drawn in Step 3 to compute the yearly changes in portfolio value. From there, we create a sequence of 20 portfolio values, starting with the initial value of $100,000.<\/p>\n<p><strong>Step 5: Calculate the final portfolio value<\/strong><\/p>\n<p>The average portfolio value at the end of 20 years \\((V_{iT})\\) is calculated by summing up the portfolio values at the end of each year and dividing by 20. We then calculate the present value \\((V_{i0})\\) of this average value by discounting it to the present using an appropriate interest rate. The subscript \\(i\\) in \\(V_{iT}\\) and \\(V_{i0}\\) indicates that these values are from the ith bootstrap sample. This completes one bootstrap sample.<\/p>\n<p><strong>Step 6: Repeat steps 4 and 5 over the required number of trials<\/strong><\/p>\n<p>Finally, we repeat steps 4 and 5 multiple times, say, 1,000 times. We then calculate summary statistics, such as the mean, median, and percentiles of the distribution of \\(V_{i0}\\) values. These summary statistics provide a range of potential outcomes for the portfolio value after 20 years, helping the investor understand the risks and rewards of the investment strategy based on the observed empirical distribution of returns.<\/p>\n<blockquote>\n<h2>Question<\/h2>\n<p>Which of the following statements is <em>most likely<\/em> accurate in relation to bootstrap analysis?<\/p>\n<ol type=\"A\">\n<li>Bootstrap analysis aims to deduce statistics about population parameters from a singular sample.<\/li>\n<li>Bootstrap analysis involves the repeated extraction of samples of equal size, with replacement, from the initial population.<\/li>\n<li>During bootstrap analysis, it is necessary for analysts to determine probability distributions for primary risk factors that govern the underlying random variables.<\/li>\n<\/ol>\n<p><strong>Solution<\/strong><\/p>\n<p><strong>The correct answer is A<\/strong>.<\/p>\n<p>The bootstrap analysis employs random sampling to generate an observed variable from a set of unknown population parameters. Although the actual distribution of the population is unknown to the analyst, the parameters of the population can be inferred through the sample produced via random sampling.<\/p>\n<p><strong>B is incorrect<\/strong>. In bootstrap analysis, the analyst repeatedly samples from the initial sample, not the entire population. Each resample has the same size as the original sample, and for each new draw, selected items go back into the sample.<\/p>\n<p><strong>C is incorrect<\/strong>. During bootstrap analysis, analysts simply utilize the empirical distribution of the observed underlying variables. In contrast, the analyst must establish probability distributions for the key risk factors that govern the underlying variables in a Monte Carlo simulation.<\/p>\n<\/blockquote>\n<div style=\"text-align: center; margin: 40px 0;\"><a style=\"display: inline-block; padding: 12px 30px; background: #3f78d7; color: #fff; border-radius: 40px; font-size: 18px; text-decoration: none;\" href=\"https:\/\/analystprep.com\/free-trial\/\" target=\"_blank\" rel=\"noopener\"> Start Free Trial \u2192 <\/a>\n<p style=\"margin-top: 12px; max-width: 600px; margin-left: auto; margin-right: auto;\">Solve CFA-style sampling questions and master bootstrap resampling techniques.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Resampling Resampling means repeatedly drawing samples from the original observed sample to make statistical inferences about population parameters. There are two common methods: Bootstrap and jackknife. Here, we&#8217;ll focus on the Bootstrap method. Practice bootstrap resampling questions with our free&#8230;<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-45522","post","type-post","status-publish","format-standard","hentry","category-quantitative-methods","blog-post","no-post-thumbnail","animate"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Bootstrap Sampling Explained | CFA Level 1<\/title>\n<meta name=\"description\" content=\"Learn what a bootstrap sample is, explore the bootstrap resampling method, and understand bootstrapping vs Monte Carlo simulation.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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