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Author's title

Author*The author of this computation has been verified*
R Software Modulerwasp_edauni.wasp
Title produced by softwareUnivariate Explorative Data Analysis
Date of computationMon, 27 Oct 2008 15:42:20 -0600
Cite this page as followsStatistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?v=date/2008/Oct/27/t1225143938z0be9ssri81nyu9.htm/, Retrieved Sun, 19 May 2024 14:40:18 +0000
Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?pk=19658, Retrieved Sun, 19 May 2024 14:40:18 +0000
QR Codes:

Original text written by user:
IsPrivate?No (this computation is public)
User-defined keywords
Estimated Impact167
Family? (F = Feedback message, R = changed R code, M = changed R Module, P = changed Parameters, D = changed Data)
F     [Univariate Explorative Data Analysis] [Investigation Dis...] [2007-10-21 17:06:37] [b9964c45117f7aac638ab9056d451faa]
F    D    [Univariate Explorative Data Analysis] [Univariate explor...] [2008-10-27 21:42:20] [d592f629d96b926609f311957d74fcca] [Current]
-   P       [Univariate Explorative Data Analysis] [] [2008-10-28 19:40:34] [077ffec662d24c06be4c491541a44245]
-   P       [Univariate Explorative Data Analysis] [Q7 UEDA verbetering] [2008-10-29 15:43:41] [cf9c64468d04c2c4dd548cc66b4e3677]
Feedback Forum
2008-10-28 19:49:00 [Glenn De Maeyer] [reply
De student vergat hier de lag plot in te voeren. Je geeft hier best lag = 12 in ofwel lag = 36. (LINK: http://www.freestatistics.org/blog/index.php?v=date/2008/Oct/28/t1225222884w0z5p44ro4ihw05.htm) Voor de bespreking van de eerste voorwaarde (Of het om onafhankelijke trekkingen gaat) maakt hij gebruik van het run sequence plot. Dit bestudeer je echter best aan de hand van de lag plots. Als we hier de lag plot bekijken merken we dat de punten dichtbij de grafiek liggen. We kunnen dus veronderstellen dat er sprake is van een positieve correlatie.
Bij de derde voorwaarde (of de verdeling een constant niveau heeft) had de student kunnen vermelden dat de run sequence plot afwisselend stijgt en daalt zonder terugkerend patroon. We kunnen dus besluiten dat de verdeling geen constant niveau heeft.
De 2e en de 4e voorwaarde werden correct besproken.
2008-10-29 16:05:44 [Jan Van Riet] [reply
Ook hier heb je de lags vergeten in te stellen, waardoor je de autocorrelation function en lag plot verliest. In de volgende link staan ze wel, met lag 12:

http://www.freestatistics.org/blog/index.php?v=date/2008/Oct/29/t1225295666ywgfe94yq8k6hd7.htm

Bij assumptie 1 trek je geen conclusie. De conclusie trek ik uit de autocorrelation function en de lag plot: er is zeker autocorrelatie, er is zelfs sprake van een Strong Autocorrelation and Autoregressive Model (zie elektronisch HB 1.3.3.1.3). Op de lag plot wordt er ook duidelijk een figuur gevormd.

Ivm assumption 2 trek je de verkeerde conclusie. Er is nl. wel een gelijke verdeling van de tijdreeks.

Betreffende assumption 3 trek je de juiste conclusie, maar dit aan de hand van de verkeerde grafiek. Je moet nl. naar de Run Sequence plot kijken, en deze laat zien dat het niveau op lange termijn niet gelijk of constant blijft.

Assumption 4 klopt wel; de spreiding is niet constant want als we de grafiek van de Run Sequence plot in 2 delen delen zijn deze 2 delen zeer verschillend te noemen qua verdeling.
2008-10-29 16:20:06 [Jan Van Riet] [reply
Inderdaad, op de Run Sequence plot is duidelijk af te lezen dat er geen sprake is van seizonaliteiten (er zijn geen waarden die om de zoveel tijd terugkomen).

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Dataseries X:
2120.88
2174.56
2196.72
2350.44
2440.25
2408.64
2472.81
2407.60
2454.62
2448.05
2497.84
2645.64
2756.76
2849.27
2921.44
2981.85
3080.58
3106.22
3119.31
3061.26
3097.31
3161.69
3257.16
3277.01
3295.32
3363.99
3494.17
3667.03
3813.06
3917.96
3895.51
3801.06
3570.12
3701.61
3862.27
3970.10
4138.52
4199.75
4290.89
4443.91
4502.64
4356.98
4591.27
4696.96
4621.40
4562.84
4202.52
4296.49
4435.23
4105.18
4116.68
3844.49
3720.98
3674.40
3857.62
3801.06
3504.37
3032.60
3047.03
2962.34




Summary of computational transaction
Raw Inputview raw input (R code)
Raw Outputview raw output of R engine
Computing time3 seconds
R Server'Sir Ronald Aylmer Fisher' @ 193.190.124.24

\begin{tabular}{lllllllll}
\hline
Summary of computational transaction \tabularnewline
Raw Input & view raw input (R code)  \tabularnewline
Raw Output & view raw output of R engine  \tabularnewline
Computing time & 3 seconds \tabularnewline
R Server & 'Sir Ronald Aylmer Fisher' @ 193.190.124.24 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=19658&T=0

[TABLE]
[ROW][C]Summary of computational transaction[/C][/ROW]
[ROW][C]Raw Input[/C][C]view raw input (R code) [/C][/ROW]
[ROW][C]Raw Output[/C][C]view raw output of R engine [/C][/ROW]
[ROW][C]Computing time[/C][C]3 seconds[/C][/ROW]
[ROW][C]R Server[/C][C]'Sir Ronald Aylmer Fisher' @ 193.190.124.24[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=19658&T=0

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=19658&T=0

As an alternative you can also use a QR Code:  

The GUIDs for individual cells are displayed in the table below:

Summary of computational transaction
Raw Inputview raw input (R code)
Raw Outputview raw output of R engine
Computing time3 seconds
R Server'Sir Ronald Aylmer Fisher' @ 193.190.124.24







Descriptive Statistics
# observations60
minimum2120.88
Q12952.115
median3499.27
mean3444.10433333333
Q34003.87
maximum4696.96

\begin{tabular}{lllllllll}
\hline
Descriptive Statistics \tabularnewline
# observations & 60 \tabularnewline
minimum & 2120.88 \tabularnewline
Q1 & 2952.115 \tabularnewline
median & 3499.27 \tabularnewline
mean & 3444.10433333333 \tabularnewline
Q3 & 4003.87 \tabularnewline
maximum & 4696.96 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=19658&T=1

[TABLE]
[ROW][C]Descriptive Statistics[/C][/ROW]
[ROW][C]# observations[/C][C]60[/C][/ROW]
[ROW][C]minimum[/C][C]2120.88[/C][/ROW]
[ROW][C]Q1[/C][C]2952.115[/C][/ROW]
[ROW][C]median[/C][C]3499.27[/C][/ROW]
[ROW][C]mean[/C][C]3444.10433333333[/C][/ROW]
[ROW][C]Q3[/C][C]4003.87[/C][/ROW]
[ROW][C]maximum[/C][C]4696.96[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=19658&T=1

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=19658&T=1

As an alternative you can also use a QR Code:  

The GUIDs for individual cells are displayed in the table below:

Descriptive Statistics
# observations60
minimum2120.88
Q12952.115
median3499.27
mean3444.10433333333
Q34003.87
maximum4696.96



Parameters (Session):
par1 = 0 ; par2 = 0 ;
Parameters (R input):
par1 = 0 ; par2 = 0 ;
R code (references can be found in the software module):
par1 <- as.numeric(par1)
par2 <- as.numeric(par2)
x <- as.ts(x)
library(lattice)
bitmap(file='pic1.png')
plot(x,type='l',main='Run Sequence Plot',xlab='time or index',ylab='value')
grid()
dev.off()
bitmap(file='pic2.png')
hist(x)
grid()
dev.off()
bitmap(file='pic3.png')
if (par1 > 0)
{
densityplot(~x,col='black',main=paste('Density Plot bw = ',par1),bw=par1)
} else {
densityplot(~x,col='black',main='Density Plot')
}
dev.off()
bitmap(file='pic4.png')
qqnorm(x)
grid()
dev.off()
if (par2 > 0)
{
bitmap(file='lagplot.png')
dum <- cbind(lag(x,k=1),x)
dum
dum1 <- dum[2:length(x),]
dum1
z <- as.data.frame(dum1)
z
plot(z,main=paste('Lag plot, lowess, and regression line'))
lines(lowess(z))
abline(lm(z))
dev.off()
bitmap(file='pic5.png')
acf(x,lag.max=par2,main='Autocorrelation Function')
grid()
dev.off()
}
summary(x)
load(file='createtable')
a<-table.start()
a<-table.row.start(a)
a<-table.element(a,'Descriptive Statistics',2,TRUE)
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'# observations',header=TRUE)
a<-table.element(a,length(x))
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'minimum',header=TRUE)
a<-table.element(a,min(x))
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Q1',header=TRUE)
a<-table.element(a,quantile(x,0.25))
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'median',header=TRUE)
a<-table.element(a,median(x))
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'mean',header=TRUE)
a<-table.element(a,mean(x))
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'Q3',header=TRUE)
a<-table.element(a,quantile(x,0.75))
a<-table.row.end(a)
a<-table.row.start(a)
a<-table.element(a,'maximum',header=TRUE)
a<-table.element(a,max(x))
a<-table.row.end(a)
a<-table.end(a)
table.save(a,file='mytable.tab')