Please enable Javascript in your browser to use this Cailleux Roundness Index calculator. Hover over the image to display the data. A menu appears above the box plot offering several options, including downloading an image.
Select the type of box plot required and the 'Open Box Plot' button will open your box plot in a new window. Click the 'Calculate' button to calculate your box plot and mean values. The lower the Roundness Index is, the more angular the pebble.Įnter your particle radius and long axis in the calculator below. A perfectly spherical pebble has a roundness Index of 1000. Roundness values lie between 0 and 1,000 and apply to a limited size range as the radius is likely to be a function of particle size itself. As the distance of transport increases, variability of roundness within a sedimentary deposit tends to decrease, and particle shapes become more rounded through the processes of attrition and abrasion. river, coastal, glacial) in which it is deposited. The degree of wear is closely related to the hardness of the geology, the distance the particle has been transported by running water and the type of environment (e.g. Roundness refers to the amount of wear displayed. The size and shape of all particles depend initially upon the composition of the rock from which they originated and the weathering and transportation processes to which they have been subjected. Interestingly, the French word 'cailleux' means 'pebbles'. The index was developed by French geographers Cailleux and Tricart in 1963. The Cailleux Roundness Index ( R) measures the radius of curvature ( r) of the sharpest corner of a particle in relation to its longest dimension or long axis ( l) using the formula:
#Box plot calculator download
Hover the mousse cursor at the top right of the diagram and one option allows to download the box plot as png file.Cailleux Roundness Index Calculator with Box Plot AnalysisĬalculate the Cailleux Roundness Index for each pebble or sedimentary particle and create a box plot to analyse the results. Hover the mousse cursor over any of the graphs and statistical quantities such as quartiles, median, mean and standard deviation will be displayed. This box plot gives more information on how is data distributed around the mean. On the right side (in blue), the box plot of the same data with the standard deviation ? represented by the upper and lower vertices of a rhombus corresponding to mean + ? and mean - ? respectively. In the middle (in blue), the box plot of the same data with the mean represented by a broken line. This will help undrestand how the quartiles split the data into 4 intervals with 25% of the data values in each group. ADVERTISEMENT A box plot is perhaps the easiest method for visualizing a dataset without listing the individual values. What is a Box Plot The plot box is a simple way of finding the ascending order, descending order, maximum and minimum numbers. First quartile, Q1, is the far left of the box (or the far right of the left whisker). The box plot calculator is a standardized way of displaying the distribution of data. On the left side (in red), data values (dots) and the box plot are displayed. What is a Boxplot The minimum (the smallest number in the data set). If you have data that is already formatted (values separated by commas) it may be copied and pasted into the data input.ĭata Values: 4,6,10,5,7,6,3,1,4,7,5.5,8,9,14,11,4
Edit or enter data values separated by commas and press "Create Box Plots". This grapher is for one data set and includes one box plot with the quartiles and median, a second box plot including the mean and a third box plot including information about the standard deviation. Use Box Plots Calculator and Grapher for One Data Set A grapher for up to five different data sets may be used to compare how data is distributed in different data sets. These graphers also calculate the quartiles, standard deviation and mean and present these statistical parameters on the same diagram. These graphing calculators accept data sets in the form of values separated by commas. Online box plot graphers and calculators, to help you understand the quartiles and spread of data, are presented. Box Plot Calculator and Grapher Box Plots Calculator and Grapher
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