Significance testing without truth

A popular approach to significance testing proposes to decide whether the given hypothesized statistical model is likely to be true (or false). Statistical decision theory provides a basis for this approach by requiring every significance test to make a decision about the truth of the hypothesis/model under consideration. Unfortunately, many interesting and useful models are obviously false (that is, not exactly true) even before considering any data. Fortunately, in practice a significance test need only gauge the consistency (or inconsistency) of the observed data with the assumed hypothesis/model -- without enquiring as to whether the assumption is likely to be true (or false), or whether some alternative is likely to be true (or false). In this practical formulation, a significance test rejects a hypothesis/model only if the observed data is highly improbable when calculating the probability while assuming the hypothesis being tested; the significance test only gauges whether the observed data likely invalidates the assumed hypothesis, and cannot decide that the assumption -- however unmistakably false -- is likely to be false a priori, without any data.Comment: 9 page

Data compression with application to geo-location

A common way to locate an emitter within a wireless sensor network requires the estimation of time-difference-of-arrival (TDOA) parameters using data collected by a set of spatially separated sensors. Compressing the data that is shared among the sensors can provide tremendous savings in terms of the energy and transmission latency. Traditional MSE and perceptual based data compression schemes fail to accurately capture the effects of compression on the TDOA estimation task; therefore, it is necessary to investigate compression algorithms suitable for TDOA parameter estimation. This thesis explores the effects of data compression on TDOA parameter estimation accuracy. The first part of this document investigates the decimation of band-limited communication signals which are oversampled to achieve high precision in the TDOA estimate. In the second part, we follow the work of [19-22] in implementing a Fisher Information-based subband encoding scheme, an approach that has been shown to provide better results than the traditional MSE-based approach. A pseudo-QMF filter bank [8] is implemented, which is computationally more efficient than wavelet packet filter banks, at the cost of relaxing perfect reconstruction conditions. Additionally, a suboptimal bit allocation algorithm is developed which further lessens the sensor resource requirements for compression

Alien Registration- Perkins, William K. (Pittsfield, Somerset County)

https://digitalmaine.com/alien_docs/6710/thumbnail.jp

Petrology and Mineralogy of Quaternary Basalts, Gem Valley and Adjacent Bear River Range, Southeastern Idaho

Quaternary basalts of Gem Valley, Idaho, are present as valley fill (Group 1) and as well defined flows in the Bear River Range (Group 2) east of Gem Valley. Minerals present in both groups of basalts include olivine (Fo73 -Fo39), augite (Wo41 En39 Fs20), plagioclase (An75 -An40), and Fe-Ti oxides. Coexisting pairs of magnetite and ilmenite, and olivine and clinopyroxene in several samples indicate temperatures of crystallization from 958°c to 1167°c. The Group 2 basalts exhibit a cumulate texture with abundant large (2 cm) phenocrysts of plagioclase. Chemically, the Gem Valley basalts are similar to the basalts of the Snake River Plain with respect to SiO2, total Fe, P2O5 and Na2O but differ in the amounts of Al2O3 and MgO present. The Al2O3 is generally higher and the MgO is generally lower in the Gem Valley basalts. Comparing Group 1 with Group 2 basalts, the Group 2 basalts generally have more alumina and alkalis than the Group 1 basalts. Chemically both groups of basalt exhibit characteristics of the tholeiitic basalt suite, because they are hypersthene normative. Mineralogically, both groups of basalt contain but one pyroxene, augite, which is characteristic of the alkali-olivine basalt suite. This apparent contrast in classifications may be resolved by referring to these basalts as transitional between the alkali-olivine and tholeiitic basalt .suites, with the restriction that no genetic relationship to either suite is implied. Within the limits of this study, it is proposed that the Group 1 basalts may have formed by the partial melting of mantle material with a pyrolite composition. Furthermore, the Group 2 basalts appear to have originated as a result of the accumulation of plagioclase in a fractionating magma of Group 1 composition

The effects of microcomputer use on the critical thinking skills of middle school students

The purpose of this study was to determine whether teaching critical thinking skills with the microcomputer produces a greater increase in the thinking skills of middle school students than teaching critical thinking skills with conventional methods.;The sample consisted of ten intact classes (N = 204) of seventh grade students who had registered for a class called, Problem Solving with the Microcomputer. Five of the classes were assigned at random to two treatment groups and five classes served as the control group. Trained teachers instructed the treatment groups in a nine week course in critical thinking and problem solving consisting of four learning modules: analogous reasoning, logical reasoning, inductive/deductive reasoning, and problem analysis. Both treatment groups were alternately taught two of the learning modules with the aid of the microcomputer and two of the modules taught with conventional methods. The control group received no special instruction in critical thinking skills. The conventional instruction consisted of lecture, discussion, and paper-and-pencil worksheets covering the same instructional objectives presented by the microcomputer software. All classes met daily for 50 minute periods. Selected subtests from the Ross Test of Higher Cognitive Processes and from the Test of Cognitive Skills were administered to all students as pretest-posttest measures of critical thinking skills. The Otis-Lennon Mental Ability Test was administered as a pretest-posttest measure of scholastic aptitude.;The major findings of the study were: (1) Students in both treatment groups, microcomputer and control, who received instruction in verbal analogies achieved significantly higher gains (p \u3c .01) than the control group who received no instruction. A close match between the instruction and the assessment instrument seemed to be a contributing factor to this result. (2) No significant differences (p \u3c .05) were found between the control, microcomputer, and conventional groups on logical reasoning, inductive/deductive reasoning, or problem analysis skills. (3) No significant differences (p \u3c .05) in scholastic aptitude were found between the three groups as a result of instruction in critical thinking skills

Statistical Study of Aircraft Icing Probabilities at the 700- and 500- Millibar Levels over Ocean Areas in the Northern Hemisphere

A statistical study is made of icing data reported from weather reconnaissance aircraft flown by Air Weather Service (USAF). The weather missions studied were flown at fixed flight levels of 500 millibars (18,000 ft) and 700 millibars (10,000 ft) over wide areas of the Pacific, Atlantic, and Arctic Oceans. This report is presented as part of a program conducted by the NACA to obtain extensive icing statistics relevant to aircraft design and operation. The thousands of in-flight observations recorded over a 2- to 4-year period provide reliable statistics on icing encounters for the specific areas, altitudes, and seasons included in the data. The relative frequencies of icing occurrence are presented, together with the estimated icing probabilities and the relation of these probabilities to the frequencies of flight in clouds and cloud temperatures. The results show that aircraft operators can expect icing probabilities to vary widely throughout the year from near zero in the cold Arctic areas in winter up to 7 percent in areas where greater cloudiness and warmer temperatures prevail. The data also reveal a general tendency of colder cloud temperatures to reduce the probability of icing in equally cloudy conditions

Retail Wheeling: A Closer Look

In the past few years,Maine\u27s electric utilities have begun to face the forces of competition.Maineis experiencing the effects of a national trend, a shift from a traditional and regulated system to a more innovative and competitive one. William C. Perkins analyzes a number of potential costs and risks of full-scale retail wheeling. This article is taken from the author’s presentation at a December 1994 conference entitled ”Retail Wheeling,” sponsored by the Margaret Chase Smith Center for Public Policy\u27s Project for the Study of Regulation and the Environment