A Bootstrap Stationarity Test for Predictive Regression Invalidity

In order for predictive regression tests to deliver asymptotically valid inference, account has to be taken of the degree of persistence of the predictors under test. There is also a maintained assumption that any predictability in the variable of interest is purely attributable to the predictors under test. Violation of this assumption by the omission of relevant persistent predictors renders the predictive regression invalid, and potentially also spurious, as both the finite sample and asymptotic size of the predictability tests can be significantly in ated. In response we propose a predictive regression invalidity test based on a stationarity testing approach. To allow for an unknown degree of persistence in the putative predictors, and for heteroskedasticity in the data, we implement our proposed test using a fixed regressor wild bootstrap procedure. We demonstrate the asymptotic validity of the proposed bootstrap test by proving that the limit distribution of the bootstrap statistic, conditional on the data, is the same as the limit null distribution of the statistic computed on the original data, conditional on the predictor. This corrects a long-standing error in the bootstrap literature whereby it is incorrectly argued that for strongly persistent regressors and test statistics akin to ours the validity of the fixed regressor bootstrap obtains through equivalence to an unconditional limit distribution. Our bootstrap results are therefore of interest in their own right and are likely to have applications beyond the present context. An illustration is given by re-examining the results relating to U.S. stock returns data in Campbell and Yogo (2006)

PENGEMB ANG AN ME DIA PEMB E LAJA RAN INTER A KTIF BE RBAS IS AN DR OID MATA PE L AJ ARAN TEK NIK E LEKTRONIK A DASAR KE LA S X PROGRAM STUDI KE A HLI AN E LE KT RO NIKA I ND US TR I DI SMK

PENGEMB ANG AN ME DIA PEMB E LAJA RAN INTER A KTIF BE RBAS IS AN DR OID MATA PE L AJ ARAN TEK NIK E LEKTRONIK A DASAR KE LA S X PROGRAM STUDI KE A HLI AN E LE KT RO NIKA I ND US TR I DI SMK   Oleh : Muhammad Amr i Yah ya NIM. 11501 2410 36 ABSTRA K Pene litian i ni bertuju an untuk: (1) menge t ahui f u n gsion a litas media pembe laj ar a n int eraktif ma ta pe laj a r an Tekni k El ektronika Da sar ber basis android; (2) me ngetahui k elaya kan media pe mbe la jaran in t e raktif mata pe laj a r an Tekn ik E le kt ron ika Das ar be rba s is an dr o id; ( 3 ) u n juk k e rja med ia pe mbe lajaran interakt if mata pelaj aran t e knik elek t ronika dasar pada res olusi dan s is t em ope ras i androi d yang be rbeda Pene litian ini merupak a n jenis penelit ian R& D de ngan mode l penge mba n gan wate r fa ll. Pe nelitian d ila kukan d i SM K Muha mma d iyah P ra mb ana n denga n subyek penelit ia n s i swa pro gram keah lia n E le kt ron ika Indus tri. Tahap p engu j ian k elaya k an produk d ilak u k an den ga n val id as i pr oduk ole h ahl i , uji alpha oleh pe ngguna pert ama (gu ru) d an u j i be ta ole h p e n ggu n a a k h ir ( s is w a) . Te k n ik p e n g u m pdat a di la k uka n denga n observasi, w awanc ar a, dan ang k et . Tekni k a n alis is dat a dilakuka n de nga n a na lisis de s kr ipt if. Ha s il pe nelitian in i ad al a h : (1) u j i fu ngsionalitas me dia pe mb elaja ran inte rka ti f berbasis an droid y ang t e pat pad a mata pelajar a n Tekn ik E lekt ron ika Da sa r mel iputi k emu dahan n a vi gasi , perfo rma a p likas i, dan k emud aha n o peras iona l; (2) ke la yakan me d ia pe mbelajaran b erbasis an d roid p ada mata pe la jaran Tekn ik Ele kt ron ik a Dasar, berd as arkan pen ila ian o le h a hli medi a menda p atkan rerat a skor t ot a l 5 7,5 at au m asuk da la m kat egor i “s a n gat lay ak ”, pen i l a ian oleh ah l i materi menda patka n rerata sko r t otal 39 at au masuk dala m k at egori “laya k” , penila ian ole h guru me ndapat kan re rata s kor t otal 56 atau m asuk dalam k at egori “laya k ”, d an pe n ila ia n o l eh s iswa d ipe role h rer ata skor t otal 6 1,24 at au mas u k dalam kat e gori “sangat l ayak” (3 ) unj u k kerja di la kuk a n pa da perangk at androi d menggunak an s m artphone den gan berbagai ma cam s iste m oper asi, resolus i/uku ran la yar , d an u kuran ram. A plikas i dapat be rjala n dengan baik dan tidak ditem u kan ero r . Kata Kun ci: An dro id , Me dia pe mbela jar an inter akt if, Tekn ik e le kt ronika dasa r   vi

The Use of Ceramic Waste Powder (CWP) in Making Eco-Friendly Concretes

The global production of ceramic waste powder (CWP), which is produced during the final polishing process of ceramic tiles, exceeds 22 billion tons. The disposal of CWP in landfills will cause significant environmental problems (i.e., soil, air, and groundwater pollution). CWP is characterized by its chemical composition that is mainly composed of silica (SiO2) and alumina (Al2O3). Both minerals represent more than 80% of the CWP composition. CWP has potentials to be used as an ingredient to partially or entirely replacing Portland cement to make eco-friendly concretes. This chapter summarizes the effect of using CWP in making eco-friendly concretes, with a particular focus on using CWP as a partial cement replacement in conventional-vibrated concrete (CVC) and self-compacting concrete (SCC), and the production of zero-cement alkali-activated concrete (AAC)

Multiple Patterns of FHIT Gene Homozygous Deletion in Egyptian Breast Cancer Patients

Fragile histidine triad (FHIT) gene encodes a putative tumour suppressor protein. Loss of Fhit protein in cancer is attributed to different genetic alterations that affect the FHIT gene structure. In this study, we investigated the pattern of homozygous deletion that target the FHIT gene exons 3 to 9 genomic structure in Egyptian breast cancer patients. We have found that 65% (40 out of 62) of the cases exhibited homozygous deletion in at least one FHIT exon. The incidence of homozygous deletion was not associated with patients' clinicopathological parameters including patients' age, tumour grade, tumour type, and lymph node involvement. Using correlation analysis, we have observed a strong correlation between homozygous deletions of exon 3 and exon 4 (P < 0.0001). Deletions in exon 5 were positively correlated with deletions in exon 7 (P < 0.0001), Exon 8 (P < 0.027), and exon 9 (P = 0.04). Additionally, a strong correlation was observed between exons 8 and exon 9 (P < 0.0001).We conclude that FHIT gene exons are homozygously deleted at high frequency in Egyptian women population diagnosed with breast cancer. Three different patterns of homozygous deletion were observed in this population indicating different mechanisms of targeting FHIT gene genomic structure

Geometry of Discrete Quantum Computing

Conventional quantum computing entails a geometry based on the description of an n-qubit state using 2^{n} infinite precision complex numbers denoting a vector in a Hilbert space. Such numbers are in general uncomputable using any real-world resources, and, if we have the idea of physical law as some kind of computational algorithm of the universe, we would be compelled to alter our descriptions of physics to be consistent with computable numbers. Our purpose here is to examine the geometric implications of using finite fields Fp and finite complexified fields Fp^2 (based on primes p congruent to 3 mod{4}) as the basis for computations in a theory of discrete quantum computing, which would therefore become a computable theory. Because the states of a discrete n-qubit system are in principle enumerable, we are able to determine the proportions of entangled and unentangled states. In particular, we extend the Hopf fibration that defines the irreducible state space of conventional continuous n-qubit theories (which is the complex projective space CP{2^{n}-1}) to an analogous discrete geometry in which the Hopf circle for any n is found to be a discrete set of p+1 points. The tally of unit-length n-qubit states is given, and reduced via the generalized Hopf fibration to DCP{2^{n}-1}, the discrete analog of the complex projective space, which has p^{2^{n}-1} (p-1)\prod_{k=1}^{n-1} (p^{2^{k}}+1) irreducible states. Using a measure of entanglement, the purity, we explore the entanglement features of discrete quantum states and find that the n-qubit states based on the complexified field Fp^2 have p^{n} (p-1)^{n} unentangled states (the product of the tally for a single qubit) with purity 1, and they have p^{n+1}(p-1)(p+1)^{n-1} maximally entangled states with purity zero.Comment: 24 page

Low Incidence of Androgen Receptor Mutation Among Egyptian Children with Androgen Resistance

Introduction: In Egypt, disorders of sex development (DSD) constitute a significant entity among the birth defect list. Previous studies have reported that end organ androgen unresponsiveness, i.e. Androgen resistance, was the most prevalent underlying mechanism among Egyptian 46,XY DSD cases. Based on cytogenetic and hormonal diagnostic criteria as well as few sporadic case reports, it was proposed that androgen receptor (AR) defects [i.e. Androgen insensitivity syndrome (AIS), OMIM#300068] might constitute a major etiology within this category. However, this has never been systematically ascertained through an AR molecular diagnostic approach. Aim of the Work: The current study aimed to assess the role of AR mutations as an underlying etiology among a sample of Egyptian 46,XY DSD pediatric patients presenting with androgen end organ unresponsiveness. Patients and Method: In the current study, 21 children [ag