2020年8月4日 · Visually think about this wikipedia plot and always from wikipedia, the definition of positive skew is : The right tail is longer; the mass of the distribution is concentrated on the left of the figure. The distribution is said to be right-skewed, right-tailed, or skewed to the right, despite the fact that the curve itself appears to be skewed ...

The 7th point suggests mild left skew, the last, stronger right skew. If you ignore either point, the impression of skewness is entirely determined by the other. If I had to say it was one or the other, I'd call that "right skew" but I'd also point out that the impression was entirely due to the effect of that one very large point. Without it ...

2017年3月23日 · Keeping in mind the rules, in this boxplot the median falls to the right of the center of the box, thus its distribution is negatively skewed. But I also can see that the right line is larger than the left line, thus "according to the rules" the distribution is positively skewed. How do I know the real skewness. Thanks in advance.

# This app can be (and is encouraged to be) used in a reversed # way, namely, show the QQ plot to the # students first, then tell them based on the pattern of the QQ # plot, the data is right skewed, bimodal, # heavy-tailed, etc. shinyUI(fluidPage( # Application title titlePanel("Interpreting Normal QQ Plots"), sidebarLayout( sidebarPanel ...

2016年8月28日 · Note that this asymmetry in the box of a boxplot is related to a measure of skewness called the quartile skewness (Also see here) In small samples from symmetric distributions the median may frequently be much closer …

2019年1月26日 · The correct answer should be similar, so that's probably correct; by my reckoning the box plot's lower inner-fence is -12.45 so your quartiles are probably fine (sample quartile definitions vary, but are generally close to Tukey's hinges, and - for some quartile definitions at least - sometimes hinges and quartiles do coincide).

2017年6月2日 · Just to explore the data further, I tried plotting the TotalVisits values in a box plot. The plot doesn't seem to have a lower whisker. q1=1 and there are no values between q1 and q1-1.5(IQR). The plot has q1, q2 and q3. The minimum value and q1 are the same. Is this why the boxplot doesn't have the lower whisker?

2015年11月8日 · Steeper slopes correspond to more spread, and the slope is steeper for the right half. If we look at the region from -2 to -1 on the theoretical (t) quantiles, and the corresponding interval above 0 (from 1 to 2), then the first corresponds to a much narrower interval than the second: More spread out in the right tail is "right skew".

2017年1月31日 · For example, we could have a fat left tail and a long right tail, and that is not uncommon. Thus, the best definition of skewness is from the formula used to calculate it. That is, although we plot what skewness looks like on a histogram or Q-Q plot in particular cases, there is no unique graphic description of skewness, only a mathematically one.

2018年9月8日 · Students age group is 2-9. There are more students with age 6-7 & 7-8.5. The average student age is 7. Since each group (Least-Q1, Q1-Q2, Q2-Q3 & Q3-Greatest) in box and whisker plot is roughly equally divided; thus the smallest looking group would be …