Free Statistics

of Irreproducible Research!

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 11:01:24 -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/t12251269665bpsevut223w073.htm/, Retrieved Sun, 19 May 2024 16:33:44 +0000
Statistical Computations at FreeStatistics.org, Office for Research Development and Education, URL https://freestatistics.org/blog/index.php?pk=19267, Retrieved Sun, 19 May 2024 16:33:44 +0000
QR Codes:

Original text written by user:
IsPrivate?No (this computation is public)
User-defined keywords
Estimated Impact179
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] [Reproduce Q2] [2008-10-24 13:27:07] [deb3c14ac9e4607a6d84fc9d0e0e6cc2]
F    D      [Univariate Explorative Data Analysis] [Q7 reeks: Het aan...] [2008-10-27 17:01:24] [5e9e099b83e50415d7642e10d74756e4] [Current]
- RMP         [Central Tendency] [Q9 Central Tenden...] [2008-10-27 17:51:46] [deb3c14ac9e4607a6d84fc9d0e0e6cc2]
- RMP           [Harrell-Davis Quantiles] [Q9 Harrell-Davis ...] [2008-10-27 18:01:08] [deb3c14ac9e4607a6d84fc9d0e0e6cc2]
-   P         [Univariate Explorative Data Analysis] [Feedback Q7 Lags] [2008-11-03 18:03:18] [d32f94eec6fe2d8c421bd223368a5ced]
Feedback Forum
2008-11-03 18:22:39 [Evelien Blockx] [reply
Hiervoor test je weer de 4 assumpties, in dit geval voor jouw reeks (zie ook feedback bij Q2).

Assumptie 1:
Hiervoor heb ik jouw berekening gereproduceerd en het aantal lags ingesteld op 12.
http://www.freestatistics.org/blog/date/2008/Nov/03/t1225735499ltar1fsbyyw0nlm.htm
De puntjes op de lag plot liggen rond een stijgende rechte. De autocorrelation function geeft ook positieve correlatie aan. De tijdreeks is dus niet random, er is autocorrelatie.

Assumptie 2: Deze assumptie werd correct getest en geïnterpreteerd.

Assumptie 3: Hiervoor kijk je naar de run sequence plot. Als je kijkt naar de lange termijn trend, dan merk je dat er een achteruitgang is. Het niveau is helemaal niet constant, de assumptie is niet vervuld.

Assumptie 4: Hiervoor kijk je ook naar de run sequence plot. De verticale wijdte van je tijdreeks is niet overal gelijk. De assumptie is niet vervuld.

Conclusie: Het model is niet geldig voor jouw reeks.
2008-11-03 18:59:53 [Evelien Blockx] [reply
I.v.m. vraag Q10: deze vraag heb je volgens mij goed beantwoord. In de run sequence plot is niet onmiddelijk seizoenaliteit te zien. Deze kan er echter wel zijn, maar is niet echt zichtbaar in de grafiek.
2008-11-03 20:09:32 [Niels Herremans] [reply
Zoals uit de reproductie mbt op de lag plot van Evelien blijkt liggen de punten dicht bij de rechte. Gezien deze rechte de autocorrelatie voorstelt is dus al niet aan de eerste voorwaarde voldaan. Er mag namelijk geen sprake zijn van autocorrelatie.

Voor assumptie 4: Als je inderdaad kijkt naar de run sequence plot dan zie je dat de grafiek in het eerste deel harder schommelt dan in het 2de deel.

Post a new message
Dataseries X:
577992
565464
547344
554788
562325
560854
555332
543599
536662
542722
593530
610763
612613
611324
594167
595454
590865
589379
584428
573100
567456
569028
620735
628884
628232
612117
595404
597141
593408
590072
579799
574205
572775
572942
619567
625809
619916
587625
565742
557274
560576
548854
531673
525919
511038
498662
555362
564591
541657
527070
509846
514258
516922
507561
492622
490243
469357
477580
528379
533590
517945




Summary of computational transaction
Raw Inputview raw input (R code)
Raw Outputview raw output of R engine
Computing time2 seconds
R Server'Gwilym Jenkins' @ 72.249.127.135

\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 & 2 seconds \tabularnewline
R Server & 'Gwilym Jenkins' @ 72.249.127.135 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=19267&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]2 seconds[/C][/ROW]
[ROW][C]R Server[/C][C]'Gwilym Jenkins' @ 72.249.127.135[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=19267&T=0

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=19267&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 time2 seconds
R Server'Gwilym Jenkins' @ 72.249.127.135







Descriptive Statistics
# observations61
minimum469357
Q1533590
median565464
mean562369.524590164
Q3593408
maximum628884

\begin{tabular}{lllllllll}
\hline
Descriptive Statistics \tabularnewline
# observations & 61 \tabularnewline
minimum & 469357 \tabularnewline
Q1 & 533590 \tabularnewline
median & 565464 \tabularnewline
mean & 562369.524590164 \tabularnewline
Q3 & 593408 \tabularnewline
maximum & 628884 \tabularnewline
\hline
\end{tabular}
%Source: https://freestatistics.org/blog/index.php?pk=19267&T=1

[TABLE]
[ROW][C]Descriptive Statistics[/C][/ROW]
[ROW][C]# observations[/C][C]61[/C][/ROW]
[ROW][C]minimum[/C][C]469357[/C][/ROW]
[ROW][C]Q1[/C][C]533590[/C][/ROW]
[ROW][C]median[/C][C]565464[/C][/ROW]
[ROW][C]mean[/C][C]562369.524590164[/C][/ROW]
[ROW][C]Q3[/C][C]593408[/C][/ROW]
[ROW][C]maximum[/C][C]628884[/C][/ROW]
[/TABLE]
Source: https://freestatistics.org/blog/index.php?pk=19267&T=1

Globally Unique Identifier (entire table): ba.freestatistics.org/blog/index.php?pk=19267&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
# observations61
minimum469357
Q1533590
median565464
mean562369.524590164
Q3593408
maximum628884



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')