Morven Leese
Biographic Data
| ID | 4863207 |
|---|---|
| NAME | Morven Leese |
| GIVEN NAMES | Morven |
| FAMILY NAME | Leese |
| SIGNATURE | LEESE M |
| AFFILIATIONS | British Museum |
| VERIFIED | No |
| TOTAL WORKS | 21 |
| TOTAL CITATIONS | 94 |
| AUTHOR COUNT | 21 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1978 |
| LATEST PUBLICATION YEAR | 2011 |
| H-INDEX | 6 |
Cluster Analysis
"This edition provides a thorough revision of the fourth edition which focuses on the practical aspects of cluster analysis and covers new methodology in terms of longitudinal data and provides examples from bioinformatics. Real life examples are used throughout to demonstrate the application of the theory, and figures are used extensively to illustrate graphical techniques. This book includes an appendix of getting started on cluster analysis us…
Global pattern of experienced and anticipated discrimination against people with schizophrenia
Implications of long-term conditions for both mental and physical health
The impact of mental illness on quality of life
Definition and prevalence of severe and persistent mental illness
BACKGROUND: There is little consistency in how severe mental illness (SMI) is defined in practice, and no operational definitions. AIMS: To test two operationalized definitions, based on the National Institute of Mental Health (1987) definition: the first uses three criteria (diagnosis of psychosis; duration of service contact > or = 2 years; GAF score < or = 50), the second only the last two. METHOD: Annual prevalence rates of SMI in two Europea…
The Efficient Computation of Unbiased Mahalanobis Distances and Their Interpretation in Archaeometry
This paper argues for cross‐validation to reduce bias in estimating Mahalanobis distances of individuals to groups, a particular problem with small sample sizes. Formulae for the efficient computation of cross‐validated distances, which avoid excessive matrix inversion, are given. The use of Mahalanobis distances as measures of consistency, or as indications of outlying values, is described. The little‐known technique of gamma plotting is outline…
The Availability of Raw Materials for near Eastern Cylinder Seals during the Akkadian, Post Akaddian and Ur III Periods
Studies of the materials of cylinder seals (Sax, 1986, 1991b, and in preparation a, b, c) from Western Asia throughout the 3000 years or so of their production (c. 3500 B.C. to c. 400 B.c.) have shown that there was a chronological evolution in material usage. The seals are chiefly composed of simple mineral assemblages and the selection of particular raw materials appears to have been influenced by such properties as hardness and colour. A gener…
A Scientific Study of Medieval Tiles From Bordesley Abbey, Near Redditch (Hereford and Worcester)
Archaeological work, based on the external characteristics of decorated floor tiles from the Cistercian monastery of Bordesley, has identified and characterised a series of industries supplying that site from the earlier 13th century through to dissolution in 1538. In this paper we extend these interpretations by means of neutron activation analysis (NAA) data on the body compositions of the tiles, and compare these results with manually recorded…
A Comparison of Methods Used for the Calibration of Radiocarbon Dates
Current calibration methods for single and replicate 14 C dates are compared. Various forms of tabular and graphic output are discussed. Results from all the methods show reasonable agreement but further methodological development and improvements in computer output are required. Comparison of existing techniques for a series of non-contemporaneous dates showed less agreement amongst participants on this issue. We recommend that calibrated dates …
Developments in the Early Bronze Age metallurgy of southern Britain
This discussion paper raises some theoretical issues of approach and presents selected results from an analytical programme on the early bronze metalwork of southern Britain. The analyses, performed by atomic absorption spectrophotometry, are assessed against a fine chronological model to show for example that tin bronze alloying was introduced swiftly towards the end of the third millennium BC. The consistency of tin alloying thereafter is unriv…
Frequency table analysis
A Scientific Study of N. Midlands Medieval Tile Production
This paper describes a study of neutron activation analyses of some medieval tiles from the North Midlands. Having established the feasibility of the method of analysis, we applied a number of multivariate statistical techniques to derive eleven reference groups, each consisting of tiles with similar compositions which could plausibly have originated from the same source of clay. While known kiln sites could be readily distinguished, less confide…
Bronze Bowls With Handles From Nimrud—a Note
An Intercomparison of Some AMS and Small Gas Counter Laboratories
The performance of six laboratories with the capacity to date small samples (4 AMS and 2 small gas-counter laboratories) has been compared using 100mg samples of textiles from Ancient Egypt and Peru, with the British Museum laboratory acting as independent coordinator. This intercomparison was one of normal practices and has demonstrated that a coherent series of results can be obtained when several laboratories undertake blindfold measurements, …
Detection of Bias in the Background of Vials Used for Radiocarbon Dating
Inter-vial variation in background of the glass vials used in liquid scintillation counting can introduce appreciable errors into 14 C measurements. Our aim was to measure the background in each of 50 glass vials, under the same conditions as far as possible, in order to find a self-consistent set for use in 14 C dating. The criteria, statistical tests, and possible errors introduced by not making such checks are discussed
Textural Analysis of Ceramic Thin Sections
‘Textural analysis’ is being increasingly used for the characterisation of pottery fabrics. In this study we have investigated some of the effects on the observed size distribution data of applying a number of different grain selection procedures (principally various point‐counting and ribbon‐counting procedures). The results indicate that significant differences may arise from the application of the various techniques of grain selection and it i…
Consensus δ 13 C Values
Selected stable carbon isotope measurements published in Radiocarbon over a 12-year period have been abstracted, plotted, and summarized, to give more reliable estimates of the mean value and range of δ 13 C for five classes of natural material (human bone collagen, non-human animal bone collagen, plant materials, wood, and charcoal), and to provide a firmer base line for stable carbon isotope dietary and environmental studies
Statistical methodology in numismatic studies
The Trace Element Composition of Polished Flint Axes as an Indicator of Source
The Characterisation of Mounted Garnets
Trip-Distribution Calculations and Sampling Error
Part 1 of this paper discusses the treatment of zero observations in growth-factor methods; part 2 discusses the calibration of gravity models when the data are of different sampling variability. The problem discussed in part 1 is that zero observations are preserved at zero value in the forecast year, no matter how much growth takes place. Since the probability of making a trip is not zero but very small for those matrix cells that are empty by …
A Comparison of Methods Used for the Calibration of Radiocarbon Dates
Current calibration methods for single and replicate 14 C dates are compared. Various forms of tabular and graphic output are discussed. Results from all the methods show reasonable agreement but further methodological development and improvements in computer output are required. Comparison of existing techniques for a series of non-contemporaneous dates showed less agreement amongst participants on this issue. We recommend that calibrated dates …
Textural Analysis of Ceramic Thin Sections
‘Textural analysis’ is being increasingly used for the characterisation of pottery fabrics. In this study we have investigated some of the effects on the observed size distribution data of applying a number of different grain selection procedures (principally various point‐counting and ribbon‐counting procedures). The results indicate that significant differences may arise from the application of the various techniques of grain selection and it i…
Developments in the Early Bronze Age metallurgy of southern Britain
This discussion paper raises some theoretical issues of approach and presents selected results from an analytical programme on the early bronze metalwork of southern Britain. The analyses, performed by atomic absorption spectrophotometry, are assessed against a fine chronological model to show for example that tin bronze alloying was introduced swiftly towards the end of the third millennium BC. The consistency of tin alloying thereafter is unriv…
The Trace Element Composition of Polished Flint Axes as an Indicator of Source
The Efficient Computation of Unbiased Mahalanobis Distances and Their Interpretation in Archaeometry
This paper argues for cross‐validation to reduce bias in estimating Mahalanobis distances of individuals to groups, a particular problem with small sample sizes. Formulae for the efficient computation of cross‐validated distances, which avoid excessive matrix inversion, are given. The use of Mahalanobis distances as measures of consistency, or as indications of outlying values, is described. The little‐known technique of gamma plotting is outline…
Consensus δ 13 C Values
Selected stable carbon isotope measurements published in Radiocarbon over a 12-year period have been abstracted, plotted, and summarized, to give more reliable estimates of the mean value and range of δ 13 C for five classes of natural material (human bone collagen, non-human animal bone collagen, plant materials, wood, and charcoal), and to provide a firmer base line for stable carbon isotope dietary and environmental studies
Frequency table analysis
An Intercomparison of Some AMS and Small Gas Counter Laboratories
The performance of six laboratories with the capacity to date small samples (4 AMS and 2 small gas-counter laboratories) has been compared using 100mg samples of textiles from Ancient Egypt and Peru, with the British Museum laboratory acting as independent coordinator. This intercomparison was one of normal practices and has demonstrated that a coherent series of results can be obtained when several laboratories undertake blindfold measurements, …
Detection of Bias in the Background of Vials Used for Radiocarbon Dating
Inter-vial variation in background of the glass vials used in liquid scintillation counting can introduce appreciable errors into 14 C measurements. Our aim was to measure the background in each of 50 glass vials, under the same conditions as far as possible, in order to find a self-consistent set for use in 14 C dating. The criteria, statistical tests, and possible errors introduced by not making such checks are discussed
A Scientific Study of Medieval Tiles From Bordesley Abbey, Near Redditch (Hereford and Worcester)
Archaeological work, based on the external characteristics of decorated floor tiles from the Cistercian monastery of Bordesley, has identified and characterised a series of industries supplying that site from the earlier 13th century through to dissolution in 1538. In this paper we extend these interpretations by means of neutron activation analysis (NAA) data on the body compositions of the tiles, and compare these results with manually recorded…
The Characterisation of Mounted Garnets
A Scientific Study of N. Midlands Medieval Tile Production
This paper describes a study of neutron activation analyses of some medieval tiles from the North Midlands. Having established the feasibility of the method of analysis, we applied a number of multivariate statistical techniques to derive eleven reference groups, each consisting of tiles with similar compositions which could plausibly have originated from the same source of clay. While known kiln sites could be readily distinguished, less confide…
Statistical methodology in numismatic studies
Trip-Distribution Calculations and Sampling Error
Part 1 of this paper discusses the treatment of zero observations in growth-factor methods; part 2 discusses the calibration of gravity models when the data are of different sampling variability. The problem discussed in part 1 is that zero observations are preserved at zero value in the forecast year, no matter how much growth takes place. Since the probability of making a trip is not zero but very small for those matrix cells that are empty by …
The Characterisation of Mounted Garnets
Statistical methodology in numismatic studies
The Trace Element Composition of Polished Flint Axes as an Indicator of Source
Consensus δ 13 C Values
Selected stable carbon isotope measurements published in Radiocarbon over a 12-year period have been abstracted, plotted, and summarized, to give more reliable estimates of the mean value and range of δ 13 C for five classes of natural material (human bone collagen, non-human animal bone collagen, plant materials, wood, and charcoal), and to provide a firmer base line for stable carbon isotope dietary and environmental studies
Textural Analysis of Ceramic Thin Sections
‘Textural analysis’ is being increasingly used for the characterisation of pottery fabrics. In this study we have investigated some of the effects on the observed size distribution data of applying a number of different grain selection procedures (principally various point‐counting and ribbon‐counting procedures). The results indicate that significant differences may arise from the application of the various techniques of grain selection and it i…
Frequency table analysis
A Scientific Study of N. Midlands Medieval Tile Production
This paper describes a study of neutron activation analyses of some medieval tiles from the North Midlands. Having established the feasibility of the method of analysis, we applied a number of multivariate statistical techniques to derive eleven reference groups, each consisting of tiles with similar compositions which could plausibly have originated from the same source of clay. While known kiln sites could be readily distinguished, less confide…
Bronze Bowls With Handles From Nimrud—a Note
An Intercomparison of Some AMS and Small Gas Counter Laboratories
The performance of six laboratories with the capacity to date small samples (4 AMS and 2 small gas-counter laboratories) has been compared using 100mg samples of textiles from Ancient Egypt and Peru, with the British Museum laboratory acting as independent coordinator. This intercomparison was one of normal practices and has demonstrated that a coherent series of results can be obtained when several laboratories undertake blindfold measurements, …
Detection of Bias in the Background of Vials Used for Radiocarbon Dating
Inter-vial variation in background of the glass vials used in liquid scintillation counting can introduce appreciable errors into 14 C measurements. Our aim was to measure the background in each of 50 glass vials, under the same conditions as far as possible, in order to find a self-consistent set for use in 14 C dating. The criteria, statistical tests, and possible errors introduced by not making such checks are discussed
A Comparison of Methods Used for the Calibration of Radiocarbon Dates
Current calibration methods for single and replicate 14 C dates are compared. Various forms of tabular and graphic output are discussed. Results from all the methods show reasonable agreement but further methodological development and improvements in computer output are required. Comparison of existing techniques for a series of non-contemporaneous dates showed less agreement amongst participants on this issue. We recommend that calibrated dates …
Developments in the Early Bronze Age metallurgy of southern Britain
This discussion paper raises some theoretical issues of approach and presents selected results from an analytical programme on the early bronze metalwork of southern Britain. The analyses, performed by atomic absorption spectrophotometry, are assessed against a fine chronological model to show for example that tin bronze alloying was introduced swiftly towards the end of the third millennium BC. The consistency of tin alloying thereafter is unriv…
A Scientific Study of Medieval Tiles From Bordesley Abbey, Near Redditch (Hereford and Worcester)
Archaeological work, based on the external characteristics of decorated floor tiles from the Cistercian monastery of Bordesley, has identified and characterised a series of industries supplying that site from the earlier 13th century through to dissolution in 1538. In this paper we extend these interpretations by means of neutron activation analysis (NAA) data on the body compositions of the tiles, and compare these results with manually recorded…
The Availability of Raw Materials for near Eastern Cylinder Seals during the Akkadian, Post Akaddian and Ur III Periods
Studies of the materials of cylinder seals (Sax, 1986, 1991b, and in preparation a, b, c) from Western Asia throughout the 3000 years or so of their production (c. 3500 B.C. to c. 400 B.c.) have shown that there was a chronological evolution in material usage. The seals are chiefly composed of simple mineral assemblages and the selection of particular raw materials appears to have been influenced by such properties as hardness and colour. A gener…
The Efficient Computation of Unbiased Mahalanobis Distances and Their Interpretation in Archaeometry
This paper argues for cross‐validation to reduce bias in estimating Mahalanobis distances of individuals to groups, a particular problem with small sample sizes. Formulae for the efficient computation of cross‐validated distances, which avoid excessive matrix inversion, are given. The use of Mahalanobis distances as measures of consistency, or as indications of outlying values, is described. The little‐known technique of gamma plotting is outline…
Definition and prevalence of severe and persistent mental illness
BACKGROUND: There is little consistency in how severe mental illness (SMI) is defined in practice, and no operational definitions. AIMS: To test two operationalized definitions, based on the National Institute of Mental Health (1987) definition: the first uses three criteria (diagnosis of psychosis; duration of service contact > or = 2 years; GAF score < or = 50), the second only the last two. METHOD: Annual prevalence rates of SMI in two Europea…
The impact of mental illness on quality of life
Global pattern of experienced and anticipated discrimination against people with schizophrenia
Implications of long-term conditions for both mental and physical health
Cluster Analysis
"This edition provides a thorough revision of the fourth edition which focuses on the practical aspects of cluster analysis and covers new methodology in terms of longitudinal data and provides examples from bioinformatics. Real life examples are used throughout to demonstrate the application of the theory, and figures are used extensively to illustrate graphical techniques. This book includes an appendix of getting started on cluster analysis us…
Archaeology (8 works) · Archaeology and ancient environmental studies (7 works) · Computer Science (7 works) · Geography (7 works) · Geology (7 works) · Mathematics (6 works) · Statistics (6 works) · Cultural Heritage Materials Analysis (5 works) · Materials Science (5 works) · Geology (4 works)