{"id":8124,"date":"2023-05-28T19:33:09","date_gmt":"2023-05-28T19:33:09","guid":{"rendered":"http:\/\/euseguros.pt\/?p=8124"},"modified":"2023-05-28T20:23:37","modified_gmt":"2023-05-28T20:23:37","slug":"what-is-the-method-of-moments","status":"publish","type":"post","link":"https:\/\/euseguros.pt\/en\/what-is-the-method-of-moments\/","title":{"rendered":"What Is The Method Of Moments"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2><span style=\"text-decoration: underline;\">Method of Moments<\/span><\/h2>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>The Method of Moments is an inferential technique for estimating Population Parameters.<\/p>\n<p>These can be: the mean, variance, skewness, kurtosis and more.<\/p>\n<p>We call Moments to the Expected Values of a Random Variable.<\/p>\n<p>\u00a0We generate each moment by:<\/p>\n<p>. Arriving to the Moment Generating Function<\/p>\n<p>.Finding the corresponding derivative and plug in 0 where we have t<\/p>\n<p>To use this process we start with the Moment Generating Function.<\/p>\n<p>By definition:<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn23.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>and at<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn24.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>p(x) refers to the discrete distribution&#8217;s PMF (Probability Mass Function)<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn22.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>f(x) refers to the continuous distribution&#8217;s PDF(Probability Density Function)<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn21.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>So the first step we check what type of distribution we are handling. If it is a discrete we use the summation function, if it is a continuous distribution, we use the integrating function.<\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>After arriving at the Moment Generating Function we can then work on each individual Moment.<\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>So each moment , is the same order number of the derivative of the Moment Generating Function with 0 plugged in. M1 is the first derivative, M2 the second derivative and so on.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/M1-1.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/M2-1.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/m3-1.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/m4-1.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/mn-1.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>From here we can infer the following:<\/p>\n<p>M1 is the Expected Value<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/ex.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>And we can obtain the Variance of x by using M2 and M1<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn19.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/varx-2.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h3><strong>Moment Generating Function for the Bernoulli Distribution<\/strong><\/h3>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>The Bernoulli Distribution is discrete. It&#8217;s PMF is:<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/Bernoulli-PMF.jpg&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>We start by the definition of the MGF, where:<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn23.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>And since this is a discrete distribution , we use the discrete branch:<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn22.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>We have x=0 and x=1, so we do the substitution:<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn28.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>and get:<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn30.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>which is our Moment Generating Function (MGF)<\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>So now, we can find M1 to get E[x] and with M2 we can then obtain Var(x). Let&#8217;s do that.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn31.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>And to find Var(x) we need M2, so:<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn32.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Var(x) uses both moments, so we do the substitution and square M1 to arrive to the correct expression:<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn19.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/varx-2.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>So, the Variance is:<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn33.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h3><strong>Moment Generating Function for the Exponential Distribution<\/strong><\/h3>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>We start by firstly retrieving the Exponential distribution<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/poisson.png&#8221; _builder_version=&#8221;4.16&#8243; min_height=&#8221;97px&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>The exponential distribution is continuous so we use the integration branch.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn21.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>we now substitute function branch in our MGF<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn35.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>to get our MGF:<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn36.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>To find the first moment we do the first derivative of MGF and then plugin in 0 where t is<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn37.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>To find the second moment we do the second derivative of MGF and then plugin in 0 where t is<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn38.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>To find the variance we use the first and second moment.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn19.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/varx-2.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>So, the Variance is:<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;http:\/\/euseguros.pt\/wp-content\/uploads\/2022\/09\/CodeCogsEqn39.png&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>","protected":false},"excerpt":{"rendered":"<p>In this article we will go over the method of moments, how to calculate the expected value and variance. Read more.<\/p>","protected":false},"author":1,"featured_media":8180,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[105],"tags":[430,421,459,107],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What Is The Method Of Moments - EU Seguros<\/title>\n<meta name=\"description\" content=\"In this article we will go over the method of moments, how to calculate the expected value and variance. 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