{"product_id":"stcov232whdi","title":"Stocks \u0026 Commodities V. 23:3 (28-29): What's The Difference by John F. Ehlers","description":"Stocks \u0026amp; Commodities V. 23:3 (28-29): Whats The Difference by John F. Ehlers\u003cbr\u003e\u003cbr\u003eWhats the difference between the median and the average? Its what drives this new adaptive smoothing filter.\u003cbr\u003e\u003cbr\u003eRemember back in school when your teacher asked\nyou what the difference was between the median and the average? I remember thinking, Yeah, what is the difference? as in, Who cares? As it turns out, you should care. It is exactly that difference that drives a unique new adaptive smoothing filter that Im going to tell you about.\u003cbr\u003e\u003cbr\u003eAverage and median filters eliminate extraneous data in fundamentally different ways. An average folds noise in with the signal so that if enough points are selected, the noise is reduced by summing to its own (nearly) zero average value. On the other hand, a median filter eliminates noise by ignoring it. A big spike in the data has no impact at all on the median signal value. Median filters are used in video to eliminate impulsive, or salt and pepper noise on the picture. We will exploit these characteristics to create an adaptive\nsmoothing filter.\u003cbr\u003e\u003cbr\u003eTHE DIFFERENCE IS\u003cbr\u003e\u003cbr\u003eConsider a dataset that consists of 10 ones. Both the average and the median of this dataset is 1. Next, lets move that dataset forward as we would with a moving average, dropping the last old data sample and adding a new one. Assuming the value of the new data sample is 10, then the new average will be 1.9 (nine ones and one 10, divided by 10). On the other hand, the median of the new dataset still remains unchanged at 1. A median filter ranks all the samples within the filter and selects the middle one as the filter output. So there is\na difference between median and averaging filters. That percentage difference becomes less as the respective filter lengths are made shorter.","brand":"store-traders-com","offers":[{"title":"Default Title","offer_id":52134078022001,"sku":"\\V23\\C03\\055EHL.pdf","price":2.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/3843\/6209\/files\/unnamed_8fb2e7b8-2822-44d5-97a1-407bae27f232.jpg?v=1739664884","url":"https:\/\/shop.traders.com\/products\/stcov232whdi","provider":"Stocks \u0026 Commodities","version":"1.0","type":"link"}