Home » date » 2009 » Nov » 25 »

WS8.4

*The author of this computation has been verified*

R Software Module: /rwasp_autocorrelation.wasp (opens new window with default values)

Title produced by software: (Partial) Autocorrelation Function

Date of computation: Wed, 25 Nov 2009 11:20:27 -0700

Cite this page as follows:

Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL http://www.freestatistics.org/blog/date/2009/Nov/25/t1259173443si5o57x2onsxrl9.htm/, Retrieved Wed, 25 Nov 2009 19:24:05 +0100

BibTeX entries for LaTeX users:

@Manual{KEY,
    author = {{YOUR NAME}},
    publisher = {Office for Research Development and Education},
    title = {Statistical Computations at FreeStatistics.org, URL http://www.freestatistics.org/blog/date/2009/Nov/25/t1259173443si5o57x2onsxrl9.htm/},
    year = {2009},
}
@Manual{R,
    title = {R: A Language and Environment for Statistical Computing},
    author = {{R Development Core Team}},
    organization = {R Foundation for Statistical Computing},
    address = {Vienna, Austria},
    year = {2009},
    note = {{ISBN} 3-900051-07-0},
    url = {http://www.R-project.org},
}

Original text written by user:

IsPrivate?

No (this computation is public)

User-defined keywords:

Dataseries X:

» Textbox « » Textfile « » CSV «

8.2 8 7.5 6.8 6.5 6.6 7.6 8 8.1 7.7 7.5 7.6 7.8 7.8 7.8 7.5 7.5 7.1 7.5 7.5 7.6 7.7 7.7 7.9 8.1 8.2 8.2 8.2 7.9 7.3 6.9 6.6 6.7 6.9 7 7.1 7.2 7.1 6.9 7 6.8 6.4 6.7 6.6 6.4 6.3 6.2 6.5 6.8 6.8 6.4 6.1 5.8 6.1 7.2 7.3 6.9 6.1 5.8 6.2 7.1 7.7 7.9 7.7 7.4 7.5 8 8.1

Output produced by software:

Summary of computational transaction
Raw Input	view raw input (R code)
Raw Output	view raw output of R engine
Computing time	1 seconds
R Server	'Gwilym Jenkins' @ 72.249.127.135

Autocorrelation Function
Time lag k	ACF(k)	T-STAT	P-value
1	0.890363	5.906	0
2	0.687814	4.5624	2e-05
3	0.484302	3.2125	0.001231
4	0.352912	2.341	0.011915
5	0.304112	2.0172	0.024898
6	0.279809	1.856	0.035076
7	0.248665	1.6495	0.053088
8	0.188783	1.2522	0.108549
9	0.122468	0.8124	0.210478
10	0.075777	0.5027	0.308858
11	0.048771	0.3235	0.373921
12	0.009884	0.0656	0.474011
13	-0.020502	-0.136	0.446223
14	-0.062134	-0.4121	0.341116
15	-0.101717	-0.6747	0.251694
16	-0.126757	-0.8408	0.2025
17	-0.120744	-0.8009	0.213739
18	-0.081671	-0.5417	0.295364
19	-0.06388	-0.4237	0.336912
20	-0.075995	-0.5041	0.308355
21	-0.139892	-0.9279	0.17925
22	-0.241745	-1.6036	0.057984
23	-0.347879	-2.3076	0.012893
24	-0.408622	-2.7105	0.004771
25	-0.41578	-2.758	0.00422
26	-0.389202	-2.5817	0.00662
27	-0.346073	-2.2956	0.013262
28	-0.292969	-1.9433	0.029195
29	-0.235993	-1.5654	0.062327
30	-0.194687	-1.2914	0.101652
31	-0.156557	-1.0385	0.15236
32	-0.133768	-0.8873	0.189867
33	-0.120832	-0.8015	0.213573
34	-0.112689	-0.7475	0.229372
35	-0.090883	-0.6028	0.274852
36	-0.053776	-0.3567	0.361506

Partial Autocorrelation Function
Time lag k	PACF(k)	T-STAT	P-value
1	0.890363	5.906	0
2	-0.506304	-3.3584	0.000813
3	0.081941	0.5435	0.294752
4	0.223188	1.4805	0.072938
5	0.079804	0.5294	0.299609
6	-0.176809	-1.1728	0.12359
7	0.021334	0.1415	0.444054
8	-0.04944	-0.3279	0.372254
9	0.041932	0.2781	0.391103
10	0.017202	0.1141	0.454836
11	-0.055	-0.3648	0.358493
12	-0.20153	-1.3368	0.09408
13	0.216958	1.4391	0.078594
14	-0.178762	-1.1858	0.121038
15	-0.020061	-0.1331	0.447373
16	0.015953	0.1058	0.458104
17	0.171267	1.1361	0.131041
18	-0.052497	-0.3482	0.364666
19	-0.194781	-1.292	0.101546
20	-0.00177	-0.0117	0.495344
21	-0.167118	-1.1085	0.136827
22	-0.155677	-1.0326	0.153707
23	-0.07634	-0.5064	0.307557
24	0.05029	0.3336	0.370137
25	-0.052764	-0.35	0.364006
26	-0.032666	-0.2167	0.41473
27	0.097478	0.6466	0.260625
28	0.078621	0.5215	0.302313
29	-0.009912	-0.0658	0.473937
30	-0.028375	-0.1882	0.425785
31	0.008457	0.0561	0.477758
32	-0.014547	-0.0965	0.461784
33	-0.012333	-0.0818	0.467586
34	-0.00755	-0.0501	0.480141
35	0.004351	0.0289	0.488554
36	-0.004547	-0.0302	0.488037

Charts produced by software:

http://www.freestatistics.org/blog/date/2009/Nov/25/t1259173443si5o57x2onsxrl9/1qwqp1259173226.png (open in new window)

http://www.freestatistics.org/blog/date/2009/Nov/25/t1259173443si5o57x2onsxrl9/1qwqp1259173226.ps (open in new window)

http://www.freestatistics.org/blog/date/2009/Nov/25/t1259173443si5o57x2onsxrl9/23xyg1259173226.png (open in new window)

http://www.freestatistics.org/blog/date/2009/Nov/25/t1259173443si5o57x2onsxrl9/23xyg1259173226.ps (open in new window)

Parameters (Session):

par1 = 36 ; par2 = 1 ; par3 = 0 ; par4 = 2 ; par5 = 12 ; par6 = MA ; par7 = 0.95 ;

Parameters (R input):

par1 = 36 ; par2 = 1 ; par3 = 0 ; par4 = 2 ; par5 = 12 ; par6 = MA ; par7 = 0.95 ;

R code (references can be found in the software module):

if (par1 == 'Default') {

par1 = 10*log10(length(x))

} else {

par1 <- as.numeric(par1)

}

par2 <- as.numeric(par2)

par3 <- as.numeric(par3)

par4 <- as.numeric(par4)

par5 <- as.numeric(par5)

if (par6 == 'White Noise') par6 <- 'white' else par6 <- 'ma'

par7 <- as.numeric(par7)

if (par2 == 0) {

x <- log(x)

} else {

x <- (x ^ par2 - 1) / par2

}

if (par3 > 0) x <- diff(x,lag=1,difference=par3)

if (par4 > 0) x <- diff(x,lag=par5,difference=par4)

bitmap(file='pic1.png')

racf <- acf(x, par1, main='Autocorrelation', xlab='time lag', ylab='ACF', ci.type=par6, ci=par7, sub=paste('(lambda=',par2,', d=',par3,', D=',par4,', CI=', par7, ', CI type=',par6,')',sep=''))

dev.off()

bitmap(file='pic2.png')

rpacf <- pacf(x,par1,main='Partial Autocorrelation',xlab='lags',ylab='PACF')

dev.off()

(myacf <- c(racf$acf))

(mypacf <- c(rpacf$acf))

lengthx <- length(x)

sqrtn <- sqrt(lengthx)

load(file='createtable')

a<-table.start()

a<-table.row.start(a)

a<-table.element(a,'Autocorrelation Function',4,TRUE)

a<-table.row.end(a)

a<-table.row.start(a)

a<-table.element(a,'Time lag k',header=TRUE)

a<-table.element(a,hyperlink('http://www.xycoon.com/basics.htm','ACF(k)','click here for more information about the Autocorrelation Function'),header=TRUE)

a<-table.element(a,'T-STAT',header=TRUE)

a<-table.element(a,'P-value',header=TRUE)

a<-table.row.end(a)

for (i in 2:(par1+1)) {

a<-table.row.start(a)

a<-table.element(a,i-1,header=TRUE)

a<-table.element(a,round(myacf[i],6))

mytstat <- myacf[i]*sqrtn

a<-table.element(a,round(mytstat,4))

a<-table.element(a,round(1-pt(abs(mytstat),lengthx),6))

a<-table.row.end(a)

}

a<-table.end(a)

table.save(a,file='mytable.tab')

a<-table.start()

a<-table.row.start(a)

a<-table.element(a,'Partial Autocorrelation Function',4,TRUE)

a<-table.row.end(a)

a<-table.row.start(a)

a<-table.element(a,'Time lag k',header=TRUE)

a<-table.element(a,hyperlink('http://www.xycoon.com/basics.htm','PACF(k)','click here for more information about the Partial Autocorrelation Function'),header=TRUE)

a<-table.element(a,'T-STAT',header=TRUE)

a<-table.element(a,'P-value',header=TRUE)

a<-table.row.end(a)

for (i in 1:par1) {

a<-table.row.start(a)

a<-table.element(a,i,header=TRUE)

a<-table.element(a,round(mypacf[i],6))

mytstat <- mypacf[i]*sqrtn

a<-table.element(a,round(mytstat,4))

a<-table.element(a,round(1-pt(abs(mytstat),lengthx),6))

a<-table.row.end(a)

}

a<-table.end(a)

table.save(a,file='mytable1.tab')

This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.

Software written by Ed van Stee & Patrick Wessa

Disclaimer

Information provided on this web site is provided "AS IS" without warranty of any kind, either express or implied, including, without limitation, warranties of merchantability, fitness for a particular purpose, and noninfringement. We use reasonable efforts to include accurate and timely information and periodically update the information, and software without notice. However, we make no warranties or representations as to the accuracy or completeness of such information (or software), and we assume no liability or responsibility for errors or omissions in the content of this web site, or any software bugs in online applications. Your use of this web site is AT YOUR OWN RISK. Under no circumstances and under no legal theory shall we be liable to you or any other person for any direct, indirect, special, incidental, exemplary, or consequential damages arising from your access to, or use of, this web site.

We may request personal information to be submitted to our servers in order to be able to:

personalize online software applications according to your needs
enforce strict security rules with respect to the data that you upload (e.g. statistical data)
manage user sessions of online applications
alert you about important changes or upgrades in resources or applications

We NEVER allow other companies to directly offer registered users information about their products and services. Banner references and hyperlinks of third parties NEVER contain any personal data of the visitor.

We do NOT sell, nor transmit by any means, personal information, nor statistical data series uploaded by you to third parties.

We carefully protect your data from loss, misuse, alteration, and destruction. However, at any time, and under any circumstance you are solely responsible for managing your passwords, and keeping them secret.

We store a unique ANONYMOUS USER ID in the form of a small 'Cookie' on your computer. This allows us to track your progress when using this website which is necessary to create state-dependent features. The cookie is used for NO OTHER PURPOSE. At any time you may opt to disallow cookies from this website - this will not affect other features of this website.

We examine cookies that are used by third-parties (banner and online ads) very closely: abuse from third-parties automatically results in termination of the advertising contract without refund. We have very good reason to believe that the cookies that are produced by third parties (banner ads) do NOT cause any privacy or security risk.

FreeStatistics.org is safe. There is no need to download any software to use the applications and services contained in this website. Hence, your system's security is not compromised by their use, and your personal data - other than data you submit in the account application form, and the user-agent information that is transmitted by your browser - is never transmitted to our servers.

As a general rule, we do not log on-line behavior of individuals (other than normal logging of webserver 'hits'). However, in cases of abuse, hacking, unauthorized access, Denial of Service attacks, illegal copying, hotlinking, non-compliance with international webstandards (such as robots.txt), or any other harmful behavior, our system engineers are empowered to log, track, identify, publish, and ban misbehaving individuals - even if this leads to ban entire blocks of IP addresses, or disclosing user's identity.

FreeStatistics.org is powered by