Hypothesis testing in hedonic price estimation - On the selection of independent variables

2000 ◽  
Vol 34 (2) ◽  
pp. 293-304 ◽  
Author(s):  
David E. Andersson
Keyword(s):  
Hypothesis Testing ◽  
Hedonic Price ◽  
Independent Variables ◽  
Price Estimation ◽  
Selection Of

scholarly journals Fishing, Commitment, and Communication: A Proposal for Comprehensive Nonbinding Research Registration

2013 ◽  
Vol 21 (1) ◽  
pp. 1-20 ◽  
Author(s):  
Macartan Humphreys ◽  
Raul Sanchez de la Sierra ◽  
Peter van der Windt
Keyword(s):  
Field Experiment ◽  
Hypothesis Testing ◽  
Medical Studies ◽  
Social Scientists ◽  
Independent Variables ◽  
Advantages And Disadvantages ◽  
Published Research ◽  
Selection Of ◽  
Principal Advantage ◽  
Leading Journals

Social scientists generally enjoy substantial latitude in selecting measures and models for hypothesis testing. Coupled with publication and related biases, this latitude raises the concern that researchers may intentionally or unintentionally select models that yield positive findings, leading to an unreliable body of published research. To combat this “fishing” problem in medical studies, leading journals now require preregistration of designs that emphasize the prior identification of dependent and independent variables. However, we demonstrate here that even with this level of advanced specification, the scope for fishing is considerable when there is latitude over selection of covariates, subgroups, and other elements of an analysis plan. These concerns could be addressed through the use of a form of comprehensive registration. We experiment with such an approach in the context of an ongoing field experiment for which we drafted a complete “mock report” of findings using fake data on treatment assignment. We describe the advantages and disadvantages of this form of registration and propose that a comprehensive but nonbinding approach be adopted as a first step to combat fishing by social scientists. Likely effects of comprehensive but nonbinding registration are discussed, the principal advantage being communication rather than commitment, in particular that it generates a clear distinction between exploratory analyses and genuine tests.

scholarly journals Fishing, Commitment, and Communication: A Proposal for Comprehensive Nonbinding Research Registration

2020 ◽  
Author(s):  
Macartan Humphreys ◽  
Raul Sanchez de la Sierra ◽  
Peter Cornelis van der Windt
Keyword(s):  
Field Experiment ◽  
Hypothesis Testing ◽  
Clear Distinction ◽  
Medical Studies ◽  
Social Scientists ◽  
Independent Variables ◽  
Advantages And Disadvantages ◽  
Published Research ◽  
Selection Of ◽  
Leading Journals

Social scientists generally enjoy substantial latitude in selecting measures and models for hypothesis testing. Coupled with publication and related biases, this latitude raises the concern that researchers may intentionally or unintentionally select models that yield positive findings, leading to an unreliable body of published research. To combat this "fishing" problem in medical studies, leading journals now require preregistration of designs that emphasize the prior identification of dependent and independent variables. However, we demonstrate here that even with this level of advanced specification, the scope forfishing is considerable when there is latitude over selection of covariates, subgroups, and other elements of an analysis plan. These concerns could be addressed through the use of a form of comprehensive registration. We experiment with such an approach in the context of an ongoing field experiment for which we drafted a complete “mock report" of findings using fake data on treatment assignment. We describe the advantages and disadvantages of this form of registration and propose that a comprehensive but non-binding approach be adopted as a first step to combat fishing by social scientists. Likely effects of comprehensive but non-binding registration are discussed, the principle advantage being communication rather than commitment, in particular that it generates a clear distinction between exploratory analyses and genuine tests.

A Systematic Method for the Selection of Independent Variables in the Investigation of Complex Systems

1988 ◽  
Vol 32 (17) ◽  
pp. 1179-1182 ◽  
Author(s):  
P. Jay Merkle ◽  
Douglas B. Beaudet ◽  
Robert C. Williges ◽  
David W. Herlong ◽  
Beverly H. Williges
Keyword(s):  
Large Scale ◽  
Subjective Ratings ◽  
Systematic Method ◽  
Independent Variables ◽  
Integrated Strategy ◽  
Literature Reviews ◽  
Systematic Methodology ◽  
Research Problems ◽  
Inquiry System ◽  
Selection Of

This paper describes a systematic methodology for selecting independent variables to be considered in large-scale research problems. Five specific procedures including brainstorming, prototype interface representation, feasibility/relevance analyses, structured literature reviews, and user subjective ratings are evaluated and incorporated into an integrated strategy. This methodology is demonstrated in the context of designing the user interface for a telephone-based information inquiry system. The procedure was successful in reducing an initial set of 95 independent variables to a subset of 19 factors that warrant subsequent detailed analysis. These results are discussed in terms of a comprehensive sequential research methodology useful for investigating human factors problems.

Comparative Thermodynamics for Brayton and Rankine Cycles

1990 ◽  
Vol 112 (1) ◽  
pp. 94-99 ◽  
Author(s):  
E. W. Beans
Keyword(s):  
Thermodynamic Model ◽  
Thermal Efficiency ◽  
Unit Volume ◽  
Work Conditions ◽  
Comparison Analysis ◽  
Independent Variables ◽  
Equal Work ◽  
Maximum Work ◽  
Cycle Temperature ◽  
Selection Of

The thermal efficiency, work per unit mass, and work per unit volume of the simple Rankine and Brayton cycles are expressed in terms of seven independent variables using a simplified thermodynamic model. By requiring equal efficiency, equal work conditions, and the same maximum cycle temperature for both cycles, two necessary relationships are established between the seven independent variables. These two relationships along with two maximum work conditions produce a method for comparing required and selected properties. These comparisons provide useful guidelines for the selection of the cycle and cycle fluids. The comparison analysis shows that for a given application the more attractive cycle is strongly dependent upon the fluids selected.

scholarly journals Pengaruh CR, NPM, DAR, dan ITO terhadap Return Saham pada Perusahaan Barang Konsumsi yang Terdaftar di BEI

Owner ◽  
2020 ◽  
Vol 4 (2) ◽  
pp. 450
Author(s):  
Karla Karla ◽  
Roisantri Marpaung ◽  
Ona Lastri Saragih ◽  
Novaria Br Tobing ◽  
Yois Nelsari Malau
Keyword(s):  
Hypothesis Testing ◽  
Stock Returns ◽  
Stock Return ◽  
Financial Statements ◽  
Coefficient Of Determination ◽  
Sampling Techniques ◽  
Current Ratio ◽  
Independent Variables ◽  
Net Profit ◽  
Inventory Turnover

The purpose of the researchers conducted research to examine how the influence between the current ratio, net profit margin, debt to asset ratio and inventory turnover on stock returns. The population of 50 companies and 92 samples multiplied by four years, using documentation data and purposive sampling techniques with the results of the 2015-2018 IDX financial statements. Hypothesis testing of data is tested using classical assumptions. The coefficient of determination is obtained Adjusted R2 0.081, where the variation of stock return variables described by CR, NPM, DAR, and ITO is 8.1% and other independent variables are 91.9%. The results of the study said that partially CR, DAR, and ITO had no effect but NPM had an effect on stock returns. CR, NPM, DAR, and ITO as a whole have no effect on stock returns.

scholarly journals PENGARUH KEPERCAYAAN MEREK TERHADAP LOYALITAS PELANGGAN MEMBELI SHAMPO MEREK PANTENE (STUDI PADA MAHASISWI FAKULTAS EKONOMI UNIVERSITAS TADULAKO PALU)

2016 ◽  
Vol 2 (2) ◽  
pp. 187-198
Author(s):  
Elok Cahyaningtyas ◽  
Chalil Chalil ◽  
Ponirin Ponirin
Keyword(s):  
Hypothesis Testing ◽  
Customer Loyalty ◽  
Significant Influence ◽  
Sampling Method ◽  
Total Sample ◽  
Brand Value ◽  
Brand Trust ◽  
F Test ◽  
Purposive Sampling ◽  
Independent Variables

The aim of this research is to determine simultaneous and partial influence of trust brand on the loyalty of student of the Faculty of Economics, Tadulako University, Palu to buy Pantene Shampoo. Sampling method in this research is purposive sampling; with a total sample of 96 respondents. The results of hypothesis testing using F-test show that the three independent variables that are brand trust (X) consisting of brand characteristics (X1), the characteristics of the company (X2) and the characteristics of customers with the brand (X3) simultaneously have positive and significant influence on the dependent variable customer loyalty (Y) with sig-F of 0.000 <0.05. Furthermore, the brand characteristic variable (X1) with sig 0,001, characteristic of the company (X2) with sig of 0.001, and characteristics of customers to the brand value of sig 0.004 <0.05, which shows partial influence on customer loyalty variable (Y). R2 values of 0.645 and brand belief variable (X) simultaneously influence customer loyalty (Y) of 64.5%, while the remaining 35.5% is influenced by other factors that are not examined. Penelitian ini bertujuan untuk mengetahui pengaruh secara simultan dan parsial dari kepercayaan merek terhadap loyalitas mahasiswi Fakultas Ekonomi Universitas Tadulako Palu. Teknik penarikan sampel dalam penelitian ini adalah purposive sampling, dengan jumlah sampel sebanyak 96 responden. Hasil pengujian hipotesis menggunakan uji F bahwa ketiga variabel independen kepercayaan merek (X) yang terdiri dari karakteristik merek (X1), karakteristik perusahaan (X2) dan karakteristik pelanggan dengan merek (X3) terbukti secara simultan berpengaruh positif dan signifikan terhadap variabel dependen loyalitas pelanggan (Y) dengan nilai sig-F sebesar 0,000 < 0,05. Selanjutnya variabel karakteristik merek (X1) dengan nilai sig sebesar 0,001, karakteritik perusahaan (X2) dengan nilai sig sebesar 0,001 dan karakteristik pelanggan dengan merek nilai sig sebesar 0,004 < 0.05 yang berarti secara parsial berpengaruh terhadap variable loyalitas pelanggan (Y). Nilai R2 sebesar 0,645 dengan demikian variabel kepercayaan merek (X) yang diteliti secara serempak memberikan pengaruh terhadap variabel loyalitas pelanggan (Y) sebesar 64,5% sementara sisanya 35,5% dipengaruhi oleh faktor lain yang tidak diteliti.

The boundary layer over an impulsively started flat plate

1969 ◽  
Vol 310 (1502) ◽  
pp. 401-414 ◽  
Keyword(s):  
Boundary Layer ◽  
Leading Edge ◽  
Surface Shear Stress ◽  
Unsteady State ◽  
Similarity Condition ◽  
Surface Shear ◽  
Boundary Layer Problem ◽  
Independent Variables ◽  
Selection Of ◽  
Layer Problem

A numerical solution has been obtained for the development of the flow from the initial unsteady state described by Rayleigh to the ultimate steady state described by Blasius. The usual formulation of the problem in two independent variables is dropped, and three independent variables, in space and time, are reverted to. The boundary-layer problem is unconventional in that the boundary conditions are not completely known. Instead, it is known that the solution should satisfy a similarity condition, and use is made of this to obtain a solution by iteration. A finite-difference technique of a mixed, explicit-implicit, type is employed. The iteration converges rapidly. It is terminated where the maximum errors are estimated to be about 0.04%. A selection of the results for the velocity profiles and the surface shear stress is presented. One striking feature is the rapidity of the transition from the Rayleigh to the Blasius state. The change is practically complete, at a given station on the plate, by the time the plate has moved a distance equal to four times the distance from the station to the leading edge of the plate.

Comparison of Personality Characteristics of Physical Education and Recreation Majors, and Factors Which Affect Career Choice

1980 ◽  
Vol 51 (3_suppl2) ◽  
pp. 1291-1298
Author(s):  
James A. Batesky ◽  
John A. Malacos ◽  
Kevin M. Purcell
Keyword(s):  
Physical Education ◽  
Personality Characteristics ◽  
Control Group ◽  
Directed Search ◽  
Education Majors ◽  
Personality Profiles ◽  
Education Professionals ◽  
Independent Variables ◽  
Physical Education Majors ◽  
Selection Of

This study examined the personality characteristics of physical education and recreation majors, and ascertained why some students choose one over the other. Forty-nine physical education and recreation majors were administered Holland's Self-directed Search. A 2 × 3 fixed-factorial design was employed, sex and major plus a control group were independent variables. Both 24 recreation and 25 physical education majors were alike in the personality profiles and were very similar to recreation and physical education professionals already in the field. Significant differences were found on secondary, less dominant characteristics which may contribute to selection of a specialization area.

Are the systems the same?

2020 ◽  
Vol 17 (1) ◽  
pp. 58-83
Author(s):  
Matthew Kanwit ◽  
Silvia Pisabarro Sarrió
Keyword(s):  
Comparative Method ◽  
Independent Variables ◽  
Languages In Contact ◽  
Preference Task ◽  
Selection Of

Abstract Although two languages in contact may contain similar structures, superficial structural similarities may abscond important differences. The comparative method critically determines whether the languages differ in relative rates of variant use, the significance of independent variables, constraint rankings, and ordering within factor groups (Poplack & Tagliamonte 2001). The study explored intensifier (i.e., degree modifier) variation between Spanish muy and bien and Catalan molt and ben “very”, as based on 84 sets of responses from bilinguals on a 24-item contextualized preference task (40 in Catalan, 44 in Spanish). Results indicated significantly higher selection of muy in Spanish than molt in Catalan. Moreover, independent variables played a greater role in Spanish, with adjective quality, animacy, and verb type all predicting intensifier selection, whereas in Catalan only adjective quality was predictive. The study provided the first variationist analysis of Catalan intensification, while also revealing key systemic differences between the two languages despite surface similarities.

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