Outlier Detection and Missing Value in Time Series Ozone Data

Kaliyaperumal, Senthamarai Kannan; Kuppusamy, Manoj; Gounder, Arumugam Subbanna

doi:10.12983/ijsrk-2015-p0220-0226

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…First, the data were screened to detect any multivariate outliers; here, we calculated the Mahalanobis distance, the leverage, and the Cook's distance of the predicted variables (Kaliyaperumal & Kuppusamy, 2015;Rousseeuw & Zomeren, 1990). Next, we tested our data for the normality distribution assumptions and found that these were consistent.…”

Section: Discussionmentioning

confidence: 99%

Organizational Justice, Leader Humility, and Service Employees’ Innovative Behavior in a Collectivistic Culture: The Case of Pakistan

Abbas

Wei

2021

RBGN

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Purpose -This study serves two purposes: first, it analyzes the effects of the overall perception of justice in service industry organizations on their employees' innovative behavior; second, it investigates whether leader humility moderates the relationship between the aforementioned constructs.Design/methodology/approach -This study is quantitative in nature. A crosssectional survey method was used to collect data from 359 respondents, and a PROCESS macro for SPSS was used for the moderation analysis.Findings -The results show that employees who perceive fairness within their organization will reciprocate with innovativeness and that humility is a positive factor that increases innovative behaviors. Originality/value -Few studies have addressed the effect of the overall perception of justice on individuals' innovative behavior in service industries in developing economies and collectivist cultures. There is also a lack of empirical support regarding the role of leader humility in employees' innovative behavior. This study provides new insights into service employees' innovative behavior in a collectivist society and has implications for managers working in the services sector.

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Section: Discussionmentioning

confidence: 99%

Organizational Justice, Leader Humility, and Service Employees’ Innovative Behavior in a Collectivistic Culture: The Case of Pakistan

Abbas

Wei

2021

RBGN

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“…Eliminating outliers and data control techniques applied in this study: Turkish Method (boxplot) is used to visually show the distribution of numerical data and variability by displaying data quartiles (or percentiles) and means. A value may be considered as an outlier if it was higher than the upper fence (Uf) or lower than the lower fence (Lf) (Kaliyaperumal et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

Changes in Air Pollution During the COVID-19 in Türkiye

KARA¹,

TOROS²,

Dursun³

et al. 2022

resatmsci

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Due to the COVID-19 pandemic, countries have observed different measures that we are not used to, such as the use of masks, isolation at home, semi-curfew, and isolation. Curfews, measures, and restrictions taken to prevent the spread of COVID-19 all over the world have led to extremely significant reductions in air quality. Türkiye followed different policies such as tightening the measures when the number of cases increased during the pandemic process, relaxing the measures when the number of cases decreased, and starting the normalization periods. In this study, it is aimed to determine, analyse, and evaluate pollutant concentrations (PM₁₀, SO₂, NO₂) in different periods representing the duration of implementation of curfew and other measures in Türkiye. An average of 2.08% increase in PM₁₀ concentrations in the curfew periods and 4.12% in the normalization periods is observed compared to the previous year. In SO₂, an average increase of 7.56% is observed in the curfew periods and an increase of 32.01% in the normalization periods. In NO₂, an average of 5.19% decrease was observed in the curfew periods and a decrease of 1.92% in the normalization periods.

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“…In the second stage, total and standardised Z scores were calculated according to the scales. According to the z score, participants who were outside the [-3,+3] range were determined as outliers (Kaliyaperumal et al, 2015). According to the Z scores, 519 observations outside this range were identified as outliers and deleted from the data.…”

Section: Th Grade Levelmentioning

confidence: 99%

“…In this data, 685 participants who responded carelessly were identified and removed from the sample (Kam & Meyer, 2015). Since there was no value outside the range of [-3,+3] according to Z scores, it was decided that there was no outlier (Kaliyaperumal et al , 2015). The fact that the kurtosis and skewness coefficients are in the range of [-1.5,+1.5] indicates that the data are normally distributed (Tabachnick & Fidell, 2013).…”

Section: Th Grade Levelmentioning

confidence: 99%

Cross-National Measurement of Mathematics Intrinsic Motivation: An Investigate of Measurement Invariance with MG-CFA and Aligment Method Across Fourteen Countries

YİĞİTER

2024

Kuramsal Eğitimbilim

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One of the main objectives of international large-scale assessments is to make comparisons between different countries, education policies, education systems, or subgroups. One of the main criteria for making comparisons between different groups is to ensure measurement invariance. The purpose of this study was to test the measurement invariance of the mathematics intrinsic motivation scale across 14 countries. For this purpose, the "students like learning mathematics" scale, which measures intrinsic motivation for mathematics, was included in the TIMSS 2019 cycle. The study sample consisted of a total of 152992 students, 70192 4th grade and 82800 8th grade students from 14 different countries participating in the TIMSS 2019 cycle. Measurement invariance was tested with Multi-Group Confirmatory Factor Analysis (MG-CFA) and Alignment Method. The mathematics intrinsic motivation scale provides only configural invariance according to MG-CFA at the 4th grade level, whereas the scale provides approximate invariance according to the alignment method. At the 8th grade level, the scale provides configural and metric invariance according to MG-CFA, whereas the scale provides approximate invariance according to the alignment method. The results indicate that the mathematics intrinsic motivation scale provides approximate measurement invariance at both grade levels and that comparisons can be made between the scores of the identified countries.

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Outlier Detection and Missing Value in Time Series Ozone Data

Cited by 5 publications

References 14 publications

Organizational Justice, Leader Humility, and Service Employees’ Innovative Behavior in a Collectivistic Culture: The Case of Pakistan

Organizational Justice, Leader Humility, and Service Employees’ Innovative Behavior in a Collectivistic Culture: The Case of Pakistan

Changes in Air Pollution During the COVID-19 in Türkiye

Cross-National Measurement of Mathematics Intrinsic Motivation: An Investigate of Measurement Invariance with MG-CFA and Aligment Method Across Fourteen Countries

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