Wednesday, November 23, 2011

Statistics of Turkeys - Production, Measured in Dollars in 2010


Happy Thanksgiving, everyone!
Tomorrow is Thanksgiving, Thursday, November 24, 2011.   I am having Thanksgiving with my friends in San Francisco. What about you guys?
I would like to relate Thanksgiving to Statistics.  So I came up an idea, looking at statistics of Turkeys- Production that measured in dollars.  I got the data set from http://quickstats.nass.usda.gov/#202F2C40-1ADA-33FE-ADA4-689C43CEFEA4, and made a bar chart and did the calculation from MS Excel.  According to the record, the highest value is $736,819,000 from the State of Minnesota, and the lowest value is $53,940,000 from the State of West Virginia.






















Feel free to leave me a comment down below. Thank you!

Monday, November 21, 2011

Print and Cat in R


Print : we use print when we want R to print something.
Cat:  we can use the cat function as an alternative way to ask R to print something.

> pi
[1] 3.141593

> sqrt(2)
[1] 1.414214

> print(pi)
[1] 3.141593

> print(sqrt(2))
[1] 1.414214

> print(matrix(c(1,2,3,4,5,6,7,8),4,4))
     [,1] [,2] [,3] [,4]
[1,]    1    5    1    5
[2,]    2    6    2    6
[3,]    3    7    3    7
[4,]    4    8    4    8

> print(list("a","b","c"))
[[1]]
[1] "a"

[[2]]
[1] "b"

[[3]]
[1] "c"


> print("The zero occurs at"); print(2*pi); print("radians")
[1] "The zero occurs at"
[1] 6.283185
[1] "radians"

> cat("the zero occurs at", 2*pi, "radians.", "\n")   # using (\n) to terminate the line
the zero occurs at 6.283185 radians.

> x<-c(2, 3, 5, 7, 11, 13, 17, 19)
> cat("The prime numbers under 30 are:",x,"...\n")
The prime numbers under 30 are: 2 3 5 7 11 13 17 19 ...



Statistics VS Probability

Statistics is the study of the collection, calculation, description, organization, analysis, classification and interpretation of numerical facts or data.
Probability is the branch of mathematics that studies the possible outcomes of given events together with the outcomes' relative likelihoods and distributions.
Let's say that statistics is dealing with data, but probability is all about chance.