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Central limit theorem
5 messages · maggy yan, Tóth Zoltán, Jeff Newmiller +2 more
Hi Maggy, Sorry, I cannot help you. But as I am pretty new to R, I am interested in this assigment. May I ask you to post it? z
On Sun, Aug 14, 2011 at 3:16 PM, maggy yan <kiotoqq at googlemail.com> wrote:
my data looks like this: ? ? ? ? PM10 ? ? ? Ref ? UZ ? ? JZ ? ? ? ? WT ? RH ? FT ? WR 1 ? 10.973195 ?4.338874 nein Winter ? Dienstag ? ja nein West 2 6.381684 ?2.250446 nein Sommer ? ?Sonntag nein ? ja ?S?d 3 ? 62.586512 66.304869 ? ja Sommer ? ?Sonntag nein nein ?Ost 4 5.590101 ?8.526152 ? ja Sommer Donnerstag nein nein Nord 5 ? 30.925054 16.073091 nein Winter ? ?Sonntag nein nein ?Ost 6 ? 10.750567 ?2.285075 nein Winter ? Mittwoch nein nein ?S?d 7 ? 39.118316 17.128691 ? ja Sommer ? ?Sonntag nein nein ?Ost 8 9.327564 ?7.038572 ? ja Sommer ? ? Montag nein nein Nord 9 ? 52.271744 15.021977 nein Winter ? ? Montag nein nein ?Ost 10 ?27.388416 22.449102 ? ja Sommer ? ? Montag nein nein ?Ost 11 ? 6.460829 ?4.486329 ? ja Winter ? ?Samstag nein nein ?S?d 12 ? 5.937690 10.247768 ? ja Sommer ? ?Sonntag nein nein Nord 13 ?14.004685 ?5.155790 nein Winter ? ?Sonntag nein nein Nord 14 ?12.244333 ?7.063825 ? ja Sommer ? Mittwoch nein ? ja Nord 15 ?35.195541 12.148438 nein Winter ? ? Montag nein nein ?Ost . . . . til 200 now I should illustrate the Central limit theorem with my data. I need to make 80 times the arithmetic means of each of the 100 poisson distributet random numbers with an expected value 7. the hint says I need a metrices first which includes all of the 8000 values. but I have no idea where the 8000 values are and how to make the matrices. please help me ? ? ? ?[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
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Hi: This definitely sounds like a homework problem but it's very easy to do in R if you think about it the right way. (1) Generate a matrix of random numbers. This is easier than it looks, since you can generate a long vector of random numbers and then reshape it into a matrix. Typically, a row corresponds to a single random sample, so that should tell you how many columns you need; the number of samples tells you the number of rows. Type ?rpois at the R prompt to see its help page. If necessary, also read the result of ?matrix. (2) See the help page of the function rowMeans(). Run it on your matrix; it will return a vector. (3) Plot the histogram. See ?hist (4) Read the Posting Guide, which is linked at the bottom of this e-mail, and pay attention to the policy on homework questions. (This should be point (0), but I'm being pragmatic.) Dennis
On Sun, Aug 14, 2011 at 6:16 AM, maggy yan <kiotoqq at googlemail.com> wrote:
my data looks like this: ? ? ? ? PM10 ? ? ? Ref ? UZ ? ? JZ ? ? ? ? WT ? RH ? FT ? WR 1 ? 10.973195 ?4.338874 nein Winter ? Dienstag ? ja nein West 2 ? ?6.381684 ?2.250446 nein Sommer ? ?Sonntag nein ? ja ?S?d 3 ? 62.586512 66.304869 ? ja Sommer ? ?Sonntag nein nein ?Ost 4 ? ?5.590101 ?8.526152 ? ja Sommer Donnerstag nein nein Nord 5 ? 30.925054 16.073091 nein Winter ? ?Sonntag nein nein ?Ost 6 ? 10.750567 ?2.285075 nein Winter ? Mittwoch nein nein ?S?d 7 ? 39.118316 17.128691 ? ja Sommer ? ?Sonntag nein nein ?Ost 8 ? ?9.327564 ?7.038572 ? ja Sommer ? ? Montag nein nein Nord 9 ? 52.271744 15.021977 nein Winter ? ? Montag nein nein ?Ost 10 ?27.388416 22.449102 ? ja Sommer ? ? Montag nein nein ?Ost 11 ? 6.460829 ?4.486329 ? ja Winter ? ?Samstag nein nein ?S?d 12 ? 5.937690 10.247768 ? ja Sommer ? ?Sonntag nein nein Nord 13 ?14.004685 ?5.155790 nein Winter ? ?Sonntag nein nein Nord 14 ?12.244333 ?7.063825 ? ja Sommer ? Mittwoch nein ? ja Nord 15 ?35.195541 12.148438 nein Winter ? ? Montag nein nein ?Ost . . . . til 200 now I should illustrate the Central limit theorem with my data. I need to make 80 times the arithmetic means of each of the 100 poisson distributet random numbers with an expected value 7. the hint says I need a metrices first which includes all of the 8000 values. but I have no idea where the 8000 values are and how to make the matrices. please help me ? ? ? ?[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Perhaps, we should endeavor not to provide any kind of help for such homework problems, especially to untraceable e-mail addresses (such as gmail, hotmail, yahoo and the like)? After all, conceptualizing a solution before writing R code is very much a part of the learning process, no? Ranjan On Sun, 14 Aug 2011 17:57:38 -0500 Dennis Murphy <djmuser at gmail.com> wrote:
Hi: This definitely sounds like a homework problem but it's very easy to do in R if you think about it the right way. (1) Generate a matrix of random numbers. This is easier than it looks, since you can generate a long vector of random numbers and then reshape it into a matrix. Typically, a row corresponds to a single random sample, so that should tell you how many columns you need; the number of samples tells you the number of rows. Type ?rpois at the R prompt to see its help page. If necessary, also read the result of ?matrix. (2) See the help page of the function rowMeans(). Run it on your matrix; it will return a vector. (3) Plot the histogram. See ?hist (4) Read the Posting Guide, which is linked at the bottom of this e-mail, and pay attention to the policy on homework questions. (This should be point (0), but I'm being pragmatic.) Dennis On Sun, Aug 14, 2011 at 6:16 AM, maggy yan <kiotoqq at googlemail.com> wrote:
my data looks like this: ? ? ? ? PM10 ? ? ? Ref ? UZ ? ? JZ ? ? ? ? WT ? RH ? FT ? WR 1 ? 10.973195 ?4.338874 nein Winter ? Dienstag ? ja nein West 2 ? ?6.381684 ?2.250446 nein Sommer ? ?Sonntag nein ? ja ?S?d 3 ? 62.586512 66.304869 ? ja Sommer ? ?Sonntag nein nein ?Ost 4 ? ?5.590101 ?8.526152 ? ja Sommer Donnerstag nein nein Nord 5 ? 30.925054 16.073091 nein Winter ? ?Sonntag nein nein ?Ost 6 ? 10.750567 ?2.285075 nein Winter ? Mittwoch nein nein ?S?d 7 ? 39.118316 17.128691 ? ja Sommer ? ?Sonntag nein nein ?Ost 8 ? ?9.327564 ?7.038572 ? ja Sommer ? ? Montag nein nein Nord 9 ? 52.271744 15.021977 nein Winter ? ? Montag nein nein ?Ost 10 ?27.388416 22.449102 ? ja Sommer ? ? Montag nein nein ?Ost 11 ? 6.460829 ?4.486329 ? ja Winter ? ?Samstag nein nein ?S?d 12 ? 5.937690 10.247768 ? ja Sommer ? ?Sonntag nein nein Nord 13 ?14.004685 ?5.155790 nein Winter ? ?Sonntag nein nein Nord 14 ?12.244333 ?7.063825 ? ja Sommer ? Mittwoch nein ? ja Nord 15 ?35.195541 12.148438 nein Winter ? ? Montag nein nein ?Ost . . . . til 200 now I should illustrate the Central limit theorem with my data. I need to make 80 times the arithmetic means of each of the 100 poisson distributet random numbers with an expected value 7. the hint says I need a metrices first which includes all of the 8000 values. but I have no idea where the 8000 values are and how to make the matrices. please help me ? ? ? ?[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.