Measures of Spread: Crash Course Statistics #4
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Date: 2022-04-04
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Comments and reviews: 10
James
Overall a decent crash course but jumping from one example to another without fully explaining the conclusions we make with each is confusing for students. Stick with one use of sports scores: baseball, basketball, or QUidich (if I spelled that right) - jumping to all 3 confuses rather than clarifies for those who don't understand - otherwise, you end up preaching to the chior. Good example of standard deviation with murder but then it jumps away before explaining the example fully, another 5-10 seconds would have done it. As this is, if I show it to a class I would expect that it would clarify the concepts for about 40% but that 40% likely don't really need it. The other 60 might walk away more confused since they understood some and not the rest.
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Overall a decent crash course but jumping from one example to another without fully explaining the conclusions we make with each is confusing for students. Stick with one use of sports scores: baseball, basketball, or QUidich (if I spelled that right) - jumping to all 3 confuses rather than clarifies for those who don't understand - otherwise, you end up preaching to the chior. Good example of standard deviation with murder but then it jumps away before explaining the example fully, another 5-10 seconds would have done it. As this is, if I show it to a class I would expect that it would clarify the concepts for about 40% but that 40% likely don't really need it. The other 60 might walk away more confused since they understood some and not the rest.
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Simon
This is absolutely brilliant - I am a physician looking to do a PhD and my last formal maths course was at high school (shall we say 30+ years ago. I REALLY needed to go back to basics on statistics and this course is perfect. I feel set up to attack the more specialised texts on medical stats as you have explained the principles behind the formulae. thankyou! I have one minor point, it would have been useful to mention why you square the deviation of each data point when calculating the variance; it took my rusty brain quite a while to realise that all of the deviations above and below the mean would otherwise cancel themselves out!
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This is absolutely brilliant - I am a physician looking to do a PhD and my last formal maths course was at high school (shall we say 30+ years ago. I REALLY needed to go back to basics on statistics and this course is perfect. I feel set up to attack the more specialised texts on medical stats as you have explained the principles behind the formulae. thankyou! I have one minor point, it would have been useful to mention why you square the deviation of each data point when calculating the variance; it took my rusty brain quite a while to realise that all of the deviations above and below the mean would otherwise cancel themselves out!
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Jean
Interesting presentation. The deviation explanations are helpful. But why include murder statistics with a horror movie character? Why include kids flying around on broomsticks like witches? The violent, macabre examples are not helpful.
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Interesting presentation. The deviation explanations are helpful. But why include murder statistics with a horror movie character? Why include kids flying around on broomsticks like witches? The violent, macabre examples are not helpful.
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Raja
hello, why do we have to use variance and standard deviation as measures for dispersion in the data as opposed to just use the sum of modulus value or absolute value of the difference between data point and mean. i. e. sum(-mean-Xi-.
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hello, why do we have to use variance and standard deviation as measures for dispersion in the data as opposed to just use the sum of modulus value or absolute value of the difference between data point and mean. i. e. sum(-mean-Xi-.
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Raja
hello, why do we have to use variance and standard deviation as measures for dispersion in the data as opposed to just use the sum of modulus value or absolute value of the difference between data point and mean. i. e. sum(-mean-Xi-.
reply
hello, why do we have to use variance and standard deviation as measures for dispersion in the data as opposed to just use the sum of modulus value or absolute value of the difference between data point and mean. i. e. sum(-mean-Xi-.
reply
Raja
hello, why do we have to use variance and standard deviation as measures for dispersion in the data as opposed to just use the sum of modulus value or absolute value of the difference between data point and mean. i. e. sum(-mean-Xi-.
reply
hello, why do we have to use variance and standard deviation as measures for dispersion in the data as opposed to just use the sum of modulus value or absolute value of the difference between data point and mean. i. e. sum(-mean-Xi-.
reply
Raja
hello, why do we have to use variance and standard deviation as measures for dispersion in the data as opposed to just use the sum of modulus value or absolute value of the difference between data point and mean. i. e. sum(-mean-Xi-.
reply
hello, why do we have to use variance and standard deviation as measures for dispersion in the data as opposed to just use the sum of modulus value or absolute value of the difference between data point and mean. i. e. sum(-mean-Xi-.
reply
eoghan.
In school (in Scotland) we're told that to get standard deviation we divide by n-1 and THEN take the square root. This never made sense to me, and it's not how you explained it. Does anyone know what's going on?
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In school (in Scotland) we're told that to get standard deviation we divide by n-1 and THEN take the square root. This never made sense to me, and it's not how you explained it. Does anyone know what's going on?
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Baldur
So a mean of 307 murders and a standard deviation of 353 murders. So around 15% of the states have -46 murders or less if it follows a normal distribution. Nice to see people getting revived so frequently!
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So a mean of 307 murders and a standard deviation of 353 murders. So around 15% of the states have -46 murders or less if it follows a normal distribution. Nice to see people getting revived so frequently!
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Neha
Could you please explain the 'kurtosis' in a sample data? N It's relation to mean and median? I liked these videos. It's proving very helpful for me to understand the subject. Thank you!
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Could you please explain the 'kurtosis' in a sample data? N It's relation to mean and median? I liked these videos. It's proving very helpful for me to understand the subject. Thank you!
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