نشریه بررسی های آمار رسمی ایران
سال بیست و ششم شماره 2 (پیاپی 87، پاییز و زمستان 1394)

One of the income distributions is the generalized Beta distribution. In this paper the family of generalized Beta distribution is introduced and it was investigated in terms of maximum entropy. Also, using MATLAB the maximum entropy estimator of the parameters of this family was found, considering variety of conditions.

Increasing of absolute number and percentage of old adults and its growing trend in Iran has attracted much attention. This article focuses on the different characteristics of old men and women in urban and rural areas, based on the results of 1390 (2011) census. Looking at the age and sex distribution of elders, it appears that the percentage of elders in rural areas is more than urban areas about 1 unit, showing more ageing of age structure in rural areas. The median age also reveals that more than 50 percent of old people are below 70 year old. With attention to marriage status and while about 90 percent of old men (60 year and more) had their spouse alive, this situation was true just about half of old women, namely about 50 percent of them were widow. Illiteracy is prevalence within old adults, but situation of women is worse. Employment of older adults in private sector is remarkable, so that nearly one quarter of the total workers in this section are old women. From disability perspective, the share of old people in most disabilities such as Blindness and disorders related to body is remarkable, showing old proses accompany with increase in disorders and disabilities.

Poverty and social judgment are important topics of public and private assemblies in every society. Not only is the matter of inequality income one of the main reasons of poverty but also it is considered as one of the factors of retarders of economic development. Therefore debating and judging about how income is distributed besides spreading of models of economic development is important.
One of the most typical means of measuring inequality of income distribution is Lorene curve. The main aim of this article is conducting static studies on indicators of income distribution (by emphasizing on average and Gini coefficient) in South Khorasan.
Yet with a compressive vision, we considered the average process and Gini coefficient of income and expense of south Khorasan state in 10 recent years and its station between 31 states of the country.
Therefore, the process of changes of income in south Khorasan state and the country were compared. The result shows that south Khorasan state in these years were in low condition according to the average of income and expense that in most of the years (1387and1389) had the last level that somehow shows some limitations from educational and occupational facilities in this state. The subsequent studies show the income average of Birjand city (center of the state) is almost in the same level of the country average and it shows that this limitation is in other towns rather than the center of the state.

The characteristic of the information age which is also known as digital or computer age is that information can freely and quickly spread to the whole world with the aid of computers and the Internet. In the turbulent world of today those people are more successful which can transmit information as quickly as possible and get everyone to see. Therefore, nowadays, this infrastructure can help statistical researchers so the concept of electronic survey has risen.
In this article, Web-based survey is defined and the advantages and problems are analyzed. The base of this survey is on accessing the target population to the Internet; therefore the possibility of electronic surveys, in the city of Zahedan (with low Internet penetration) is investigated. The web questionnaire for comparing different kind of surveys was designed and the people opinions that prefer what kind of survey in different situations were questioned.

Overall planning in employment areas is the most important and fundamental form of order planning that needs indicators that reflect the changes and stock estimates of the labour force status. Over the last three decades, with the implementation of scientific and accurate surveys and collection of data on individuals and households, a board literature has emerged in the study of labor supply at the micro level. Labor force survey with rotation sampling is one of the sources that can be used to obtain labour force indicators. The labor force surveys statistics Centre of Iran, using a rotating sample that implemented quarterly since 2005. . In this paper, the method of computing flow labor force for LFS data of Iran is described and the resulting estimates by men and women are proposed. Also, by using these estimates, labour force mobility and stability, durations and forecasts of the changes in labour force status, school to work transition, various sectors of the economy and status in employment is analyzed for a period of 8 years.

Self-weighting estimation through equal probability selection methods (epsem) is desirable for variance efficiency. Traditionally, the epsem property for (one phase) two stage designs for estimating population-level parameters is realized by using each primary sampling unit (PSU) population count as the measure of size for PSU selection along with equal sample size allocation per PSU under simple random sampling (SRS) of elementary units. However, when self-weighting estimates are desired for parameters corresponding to multiple domains under a pre-specified sample allocation to domains, Folsom, Potter and Williams (1987) showed that a composite measure of size can be used to select PSUs to obtain epsem designs when besides domain-level PSU counts (i.e., distribution of domain population over PSUs), frame-level domain identifiers for elementary units are also assumed to be available. The term depsem-A will be used to denote such (one phase) two stage designs to obtain domain-level epsem estimation. Folsom et al. also considered two phase two stage designs when domain-level PSU counts are unknown, but whole PSU counts are known. For these designs (to be termed depsem-B) with PSUs selected proportional to the usual size measure (i.e., the total PSU count) at the first stage, all elementary units within each selected PSU are first screened for classification into domains in the first phase of data collection before SRS selection at the second stage. Domain-stratified samples are then selected within PSUs with suitably chosen domain sampling rates such that the desired domain sample sizes are achieved and the resulting design is self-weighting. In this paper, we first present a simple justification of composite measures of size for the depsem-A design and of the domain sampling rates for the depsem-B design. Then, for depsem-A and -B designs, we propose generalizations, first to cases where frame-level domain identifiers for elementary units are not available and domain-level PSU counts are only approximately known from alternative sources, and second to cases where PSU size measures are pre-specified based on other practical and desirable considerations of over- and under-sampling of certain domains. We also present a further generalization in the presence of subsampling of elementary units and nonresponse within selected PSUs at the first phase before selecting phase two elementary units from domains within each selected PSU. This final generalization of depsem-B is illustrated for an area sample of housing units.