# Dispersion

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## Dispersion

 Dear Guys I got this data from a student and he is asking about the three values of Dispersion (73%, 99 and 205). I don't have any other info and can't describe the three values of dispersion so please anyone know about then let me know. Thanks                         Avq. Min Max    Dispersion Cost per day (\$)  107  46  898  73%, 99 and 205 Siraj
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## Re: Dispersion

 I have sometimes seen the standard deviation referred to as "dispersion", though it is quite unusual and rather old fashioned (I have only seen it in old books). Also, all measures of variability (such as variance, std deviation, range, interquartile range, etc.) are sometimes collectively called "measures of dispersion". Hector -----Mensaje original----- De: SPSSX(r) Discussion [mailto:[hidden email]] En nombre de Siraj Ur-rehman Enviado el: Tuesday, August 15, 2006 11:04 AM Para: [hidden email] Asunto: Dispersion Dear Guys I got this data from a student and he is asking about the three values of Dispersion (73%, 99 and 205). I don't have any other info and can't describe the three values of dispersion so please anyone know about then let me know. Thanks                         Avq. Min Max    Dispersion Cost per day (\$)  107  46  898  73%, 99 and 205 Siraj
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## Re: Dispersion

 In reply to this post by Siraj Ur-rehman Hi Hector Thanks for it but what could be these numbers (73%, 99 and 205) out of different measure of dispersions? Please let me know if you can guess about any statistic for these three numbers. Thanks Siraj -----Original Message----- From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Hector Maletta Sent: Tuesday, August 15, 2006 11:36 AM To: [hidden email] Subject: Re: Dispersion I have sometimes seen the standard deviation referred to as "dispersion", though it is quite unusual and rather old fashioned (I have only seen it in old books). Also, all measures of variability (such as variance, std deviation, range, interquartile range, etc.) are sometimes collectively called "measures of dispersion". Hector -----Mensaje original----- De: SPSSX(r) Discussion [mailto:[hidden email]] En nombre de Siraj Ur-rehman Enviado el: Tuesday, August 15, 2006 11:04 AM Para: [hidden email] Asunto: Dispersion Dear Guys I got this data from a student and he is asking about the three values of Dispersion (73%, 99 and 205). I don't have any other info and can't describe the three values of dispersion so please anyone know about then let me know. Thanks                         Avq. Min Max    Dispersion Cost per day (\$)  107  46  898  73%, 99 and 205 Siraj
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## Re: Dispersion

 In reply to this post by Siraj Ur-rehman Siraj, I guess it will be difficult to guess what those numbers are with knowing the data set from which those numbers were derived. -----Original Message----- From: SPSSX(r) Discussion [mailto:[hidden email]]On Behalf Of Siraj Ur-rehman Sent: Tuesday, August 15, 2006 12:15 PM To: [hidden email] Subject: Re: Dispersion Hi Hector Thanks for it but what could be these numbers (73%, 99 and 205) out of different measure of dispersions? Please let me know if you can guess about any statistic for these three numbers. Thanks Siraj -----Original Message----- From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Hector Maletta Sent: Tuesday, August 15, 2006 11:36 AM To: [hidden email] Subject: Re: Dispersion I have sometimes seen the standard deviation referred to as "dispersion", though it is quite unusual and rather old fashioned (I have only seen it in old books). Also, all measures of variability (such as variance, std deviation, range, interquartile range, etc.) are sometimes collectively called "measures of dispersion". Hector -----Mensaje original----- De: SPSSX(r) Discussion [mailto:[hidden email]] En nombre de Siraj Ur-rehman Enviado el: Tuesday, August 15, 2006 11:04 AM Para: [hidden email] Asunto: Dispersion Dear Guys I got this data from a student and he is asking about the three values of Dispersion (73%, 99 and 205). I don't have any other info and can't describe the three values of dispersion so please anyone know about then let me know. Thanks                         Avq. Min Max    Dispersion Cost per day (\$)  107  46  898  73%, 99 and 205 Siraj
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## Re: Dispersion

 In reply to this post by Siraj Ur-rehman Hi SUr> I got this data from a student and he is asking about the three values SUr> of Dispersion (73%, 99 and 205). I don't have any other info and can't SUr> describe the three values of dispersion so please anyone know about then SUr> let me know. SUr>                         Avq. Min Max    Dispersion SUr> Cost per day (\$)  107  46  898  73%, 99 and 205 In my opinion, 73% could be the coefficient of variation (100*SD/mean), and, perhaps, given that the data look quite skewed to the right, "99 and 205" could be the interquartilic range (IQR), that is: the interval formed by Q1 and Q3 (or P25 and P75, as you wish to call them). Just guessing... -- Regards, Dr. Marta García-Granero,PhD           mailto:[hidden email] Statistician --- "It is unwise to use a statistical procedure whose use one does not understand. SPSS syntax guide cannot supply this knowledge, and it is certainly no substitute for the basic understanding of statistics and statistical thinking that is essential for the wise choice of methods and the correct interpretation of their results". (Adapted from WinPepi manual - I'm sure Joe Abrahmson will not mind)