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1.1 The Kola Ecogeochemistry Project. |
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2. Preparing the Data for Use in R and DAS+R. |
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2.1 Required data format for import into R and DAS+R. |
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2.2 The detection limit problem. |
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2.4 Some “typical” problems encountered when editing a laboratory data report file to a DAS+R file. |
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2.5 Appending and linking data files. |
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2.6 Requirements for a geochemical database. |
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3. Graphics to Display the Data Distribution. |
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3.1 The one-dimensional scatterplot. |
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3.4 Plots of the distribution function. |
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3.6 Combination of histogram, density trace, one-dimensional scatterplot, boxplot, and ECDF-plot. |
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3.7 Combination of histogram, boxplot or box-and-whisker plot, ECDF-plot, and CP-plot. |
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4. Statistical Distribution Measures. |
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4.3 Quartiles, quantiles and percentiles. |
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4.6 Summary table of statistical distribution measures. |
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5.1 Map coordinate systems (map projection). |
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5.3 Choice of the base map for geochemical mapping |
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5.4 Mapping geochemical data with proportional dots. |
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5.5 Mapping geochemical data using classes. |
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5.6 Surface maps constructed with smoothing techniques. |
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5.7 Surface maps constructed with kriging. |
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5.9 Some common mistakes in geochemical mapping. |
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6. Further Graphics for Exploratory Data Analysis. |
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6.1 Scatterplots (xy-plots). |
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6.2 Linear regression lines. |
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6.5 Spatial distance plot. |
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6.6 Spiderplots (normalized multi-element diagrams). |
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7. Defining Background and Threshold, Identification of Data Outliers and Element Sources. |
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7.1 Statistical methods to identify extreme values and data outliers. |
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7.2 Detecting outliers and extreme values in the ECDF- or CP-plot. |
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7.3 Including the spatial distribution in the definition of backgraound. |
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7.4 Methods to distinguish geogenic from anthropogenic element sources. |
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8. Comparing Data in Tables and Graphics. |
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8.1 Comparing data in tables. |
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8.2 Graphical comparison of the data distributions of several data sets. |
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8.3 Comparing the spatial data structure. |
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8.4 Subset creation – a mighty tool in graphical data analysis. |
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8.5 Data subsets in scatterplots. |
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8.6 Data subsets in time and spatial trend diagrams. |
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8.7 Data subsets in ternary plots. |
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8.8 Data subsets in the scatterplot matrix. |
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8.9 Data subsets in maps. |
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9. Comparing Data Using Statistical tests. |
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9.1 Tests for distribution (Kolmogorov–Smirnov and Shapiro–Wilk tests). |
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9.2 The one-sample t-test (test for the central value). |
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9.3 Wilcoxon signed-rank test. |
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9.4 Comparing two central values of the distributions of independent data groups. |
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9.5 Comparing two central values of matched pairs of data. |
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9.6 Comparing the variance of two test. |
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9.7 Comparing several central values. |
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9.8 Comparing the variance of several data groups. |
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9.9 Comparing several central values of dependent groups. |
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10. Improving Data Behaviour for Statistical Analysis: Ranking and Transformations. |
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10.2 Non-linear transformations. |
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10.3 Linear transformation. |
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10.4 Preparing a data set for multivariate data analysis. |
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10.5 Transformations for closed number systems. |
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11.1 Pearson correlation. |
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11.2 Spearman rank correlation. |
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11.3 Kendall-tau correlation. |
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11.4 Robust correlation coefficients. |
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11.5 When is a correlation coefficients significant? |
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11.6 Working with many variables. |
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11.7 Correlation analysis and inhomogeneous data. |
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11.8 Correlation results following addictive logratio or central logratio transformations. |
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12. Multivariate Graphics. |
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12.6 Parallel coordinates plot. |
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13. Multivariate Outlier Detection. |
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13.1 Univariate versus multivariate outlier detection. |
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13.2 Robust versus non-robust outlier detection. |
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13.3 The chi-square plot. |
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13.4 Automated multivariate outlier detection and visualization. |
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13.5 Other graphical approaches for identifying outliers and groups. |
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14. Principal Component Analysis (PCA) and Factor Analysis (FA). |
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14.1 Conditioning the data for PCA and FA. |
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14.2 Principal component analysis (PCA). |
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15.1 Possible data problems in the context of cluster analysis. |
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15.4 Clustering variables. |
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15.5 Evaluation of cluster validity. |
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15.6 Selection of variables for cluster analysis. |
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16. Regression Analysis (RA). |
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16.1 Data requirements for regression analysis. |
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16.2 Multiple regression. |
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16.3 Classical least squares (LS) regression. |
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16.5 Model selection in regression model. |
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16.6 Other regression methods. |
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17. Discriminant Analysis (DA) and Other Knowledge-Based Classification Methods. |
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17.1 Methods for discriminant analysis. |
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17.2 Data requirements for discriminant analysis. |
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17.3 Visualisation of the discriminant function. |
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17.4 Prediction with discriminant analysis. |
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17.5 Exploring for similar data structures. |
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17.6 Other knowledge-based classification methods/ |
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18. Quality Control (QC). |
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18.5 Analysis of variance (ANOVA) |
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18.6 Using Maps to assess data quality. |
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18.7 Variables analysed by two different analytical techniques. |
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18.8 Working with censored data – a practical example. |
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19. Introduction to R and Structure of the DAS+R Graphical User Interface. |
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19.1 R. |
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19.3 A brief overview of relevant R commands. |
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19.4 DAS+R. |
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