Approximately Median-Unbiased Estimation of Autoregressive Models

A hedonic model of automobile prices that takes gasoline costs into account is developed and used to examine whether gasoline price increases (especially those related to the 1973 and 1979 oil shocks) changed consumer evaluations of the relative qualities of used cars in the U.S. during 1970–1981. We test the null hypothesis that the characteristics' coefficients remained constant over time. It is rejected if gasoline costs are excluded from the model but not if they are included. Alternative approaches are developed to show that the gasoline price increases alone can explain much of the observed changes in the coefficients.     

Evaluating the Quality of Online Survey Data Collected in 2018 in the USA: Univariate,Bivariate, and Multivariate Analyses

Collecting survey data in Japan and the USA is difficult for many reasons, including the difficulty of creating complete sampling frames and low response rates. Online surveys, which collect data through online access panels and recruit members using nonprobability sampling, is becoming a popular alternative to traditional survey techniques, both in market and social science research. However, sociological researchers are hesitant to adopt online survey data collection techniques as it is unclear how representative such data are. This article examines the quality of online survey data by comparing online surveys with the two datasets collected using probability sampling, the American Community Survey and the General Social Survey. We conducted univariate, bivariate, and multivariate analyses and investigated whether similarities improve from the univariate analyses to bivariate relationships, and to bivariate relationships with controls. The results show that similarities improved from univariate to bivariate and multivariate analyses, but the results of bivariate and multivariate analyses did not differ. We concluded that data collected via volunteer‐based access panels yielded similar results to the benchmark data, especially when the relationships among variables are examined. We argue that automatically discrediting the data collected via volunteer‐based access panels is not good practice. With careful considerations of data quality, online survey data with nonprobability sampling could advance sociological research by giving researchers more freedom to ask questions at a relatively low cost, with a quick turnaround time, and more opportunities to conduct cross‐national research.     

A Comment on “Can Relaxation of Beliefs Rationalize the Winner's Curse?: An Experimental Study”

Ivanov, Levin, and Niederle (2010) use a common‐value second‐price auction experiment to reject beliefs‐based explanations for the winner's curse. ILN's conclusion, however, stems from the misuse of theoretical arguments. Beliefs‐based models are even compatible with some observations from ILN's experiment.     

The adaptive significance of leaf-mining pattern as an anti-parasitoid strategy: A theoretical study

Summary An adaptive significance of linear leaf mining patterns as the anti-parasitoid strategy is theoretically analysed. In the model, a leaf-miner is allowed to move in one of four ways; mining ahead in unexploited area of a leaf, backtracking, branching off from the backtracking mine, and crossing the previous mine. The model parasitoid searches for the leaf-miner by tracing the mine by the tactile cue of mine surface after detecting the mine. The average duration from detecting the mine to finding the leaf-miner host is calculated for various patterns of mining, changing numbers of branches and of crosses. This average duration becomes longer when the leaf-miner stays near either end of the mine compared with when staying near its center. It is also prolonged as the numbers of branches and of crosses increase.     

三代中国缘 代代中国情

我叫市川真,说起我家三代人与中国的缘分,与许多日本老百姓家庭一样,也没有什么特别的。日本和中国这邻邦靠得太近,你打哈欠我就着凉,我咳嗽你就发烧,关系如此密切,大家都和中国有或深或浅的缘分。和平年代还好些,可以从中享受,战争年代就苦了,大家颇受磨难。我父亲那辈是个不幸的年代,负面的话题不胜枚举,有些事情不好写或者不宜写。     

Relation between exploitation and production in experimental populations ofPoecilia reticulata

Summary In order to make researches on the effect of exploitation upon fish populations, six populations of guppy were maintained during a period of 331 weeks under conditions of space, light, temperature, pH, and food controlled as much as possible. The six populations were divided into three groups two by two: a control group without exploitation, a 10% rate of exploitation group and a 20 and 33% rate of exploitation group. All the populations repeated an increase and a decrease in number and in biomass about once a year. The exploitation affected the age composition in the populations: in the non-exploited population adults occupied the largest part, and the more intensive the exploitation the larger the part fry occupied. The exploitation decreased the biomass of exploited populations, but productivity increased with increasing of of rate of exploitation. The relationship between adult and fry could be represented byRicker's reproduction curve. The form of the curve was changed by an intensity of exploitation. It was thought that exploitation acts as a preventer of aging of populations by removing old fish and results increasing number of fry and productivity.     

Mining pattern of the honeysuckle leaf-minerPhytomyza lonicerae

Summary The mining pattern of the honeysuckle leaf-minerPhytomyza lonicerae which feeds onLonicera gracilipes was analyzed with special reference to the avoidance of parasitoids' attacks. The leaf-miner makes the linear mine with branches and crosses by turning and branching, off the backtracking mine. Both average numbers of turnings and branchings were about 4. The speed of mining was 1.5 times faster in backtracking than in advancing. The mine width increased as the mining larva grew and total volume of consumed plant tissue was nearly constant independent of variability of the number of turnings and other characteristics of the mine. The majority of larval mortality were due to attacks by parasitoid wasps (Chrysochairs pentheus andDiglyphus minoeus), which locate the present position of leaf-miners, by tracing mine tracks, and wasps attack leaf-miners at a higher rate in backtracking than in advancing. The adaptive significance of branching and crossing by leaf-miners was discussed in terms of the reduction of parasitoids' attacks.     

A social world of sociology in Japan

This article discusses the characteristics, problems, and future direction of sociology in Japan. The core problem of the discipline is the disparity between theories and empirical studies. That is, sociologists in Japan are not yet accustomed to the practice of integrating both conceptual inquiry and empirical methods—which has resulted in futile research that is unable to influence social policies. This article explores this problem by surveying historical and institutional circumstances that have surrounded sociologists since the founding of the discipline. The issues discussed include: the birth of the discipline, the rule of the academy by prominent universities, the system of funding, and the practice of recruitment. By suggesting problems that should be dealt with by today’s sociologists, the article indicates the road that sociologists must follow to rise above their “TV commentator” image and take on more influential social roles as professional experts.     

Double shrink methodologies to determine the sample size via covariance structures

We consider fixed-size estimation for a linear function of mean vectors from _πi:_Np(_μi,_Σi)${\pi }_i:{\mathrm{N}}_p({\mathit{\mu }}_i,{\mathbf{\Sigma }}_i)$, i=1,…,k$i=1,\dots ,k$, when every _Σi${\mathbf{\Sigma }}_i$ has some structure. The goal of inference is to construct a fixed-span confidence region with required accuracy. We find a sample size for each _πi${\pi }_i$ with the help of the ‘double shrink methodology’, that is introduced by this paper, via covariance structures of _Σi${\mathbf{\Sigma }}_i$, i=1,…,k$i=1,\dots ,k$. We estimate the sample size in a two-stage sampling and give a fixed-span confidence region that has the coverage probability approximately second-order consistent with the required accuracy. Some simulations are carried out to see moderate sample size performances of the proposed methodologies.     

A DESIGN OF NORMATIVE SOCIOLOGY BASED ON THE RATIONAL CHOICE PARADIGM

Abstract  In this paper, I metatheoretically examine a design of normative sociology. Normative sociology is the normative-scientific study in sociology. The substance of normative science is the conceptual examination of values or value judgments. According to Coleman (1974) and Faran, (1989) et al., sociologists should contribute to normative science by using ideas from general sociological theory. There is a useful traditional enterprise for this aim in sociology; that is the study of the problem of order, particularly the study of it based on the rational choice paradigm. Seiyama (1992) points to the limits of the rational choice paradigm. I propose three aims of social theory, and claim that the study of the problem of order based on this paradigm is useful when our purpose is normative model-building. I call the problem of order as a subject of the study for this purpose "the value-theoretical problem of order." This examination can clear up some of the theoretical confusion surrounding the problem of order and show the methodological basis of normative sociology based on the rational choice paradigm.