Measuring the Average Impact of an iPad Algebra Program A Report of Findings from an RCT in Four School Districts Considering One as a Special Case

2012 ◽  
Author(s):  
Andrew P Jaciw ◽  
Megan Toby ◽  
Boya Ma ◽  
Garrett Lai ◽  
Li Lin
Keyword(s):  
School Districts ◽  
Average Impact ◽  
Special Case

Extreme self-sacrifice beyond fusion: Moral expansiveness and the special case of allyship

2018 ◽  
Vol 41 ◽  
Author(s):  
Daniel Crimston ◽  
Matthew J. Hornsey
Keyword(s):  
General Theory ◽  
Biological Markers ◽  
Natural Environment ◽  
Relevant Dimension ◽  
Special Case

AbstractAs a general theory of extreme self-sacrifice, Whitehouse's article misses one relevant dimension: people's willingness to fight and die in support of entities not bound by biological markers or ancestral kinship (allyship). We discuss research on moral expansiveness, which highlights individuals’ capacity to self-sacrifice for targets that lie outside traditional in-group markers, including racial out-groups, animals, and the natural environment.

Determination of the phase structure of polymerblends by electron microscopy

1978 ◽  
Vol 36 (1) ◽  
pp. 492-493
Author(s):  
Dr. G. Kaemof
Keyword(s):  
Screw Extruder ◽  
Electron Microscopic ◽  
Thin Sections ◽  
Single Screw Extruder ◽  
Transmission Electron ◽  
The Matrix ◽  
Twin Screw ◽  
Special Case ◽  
Microscopic Investigations

A mixture of polycarbonate (PC) and styrene-acrylonitrile-copolymer (SAN) represents a very good example for the efficiency of electron microscopic investigations concerning the determination of optimum production procedures for high grade product properties.The following parameters have been varied:components of charge (PC : SAN 50 : 50, 60 : 40, 70 : 30), kind of compounding machine (single screw extruder, twin screw extruder, discontinuous kneader), mass-temperature (lowest and highest possible temperature).The transmission electron microscopic investigations (TEM) were carried out on ultra thin sections, the PC-phase of which was selectively etched by triethylamine.The phase transition (matrix to disperse phase) does not occur - as might be expected - at a PC to SAN ratio of 50 : 50, but at a ratio of 65 : 35. Our results show that the matrix is preferably formed by the components with the lower melting viscosity (in this special case SAN), even at concentrations of less than 50 %.

An Investigation of Sex-Bias in Classroom Teachers' Speech and Language Referrals

1980 ◽  
Vol 11 (3) ◽  
pp. 169-174 ◽  
Author(s):  
Ellen Marie Silverman ◽  
Katherine Van Opens
Keyword(s):  
School Districts ◽  
Voice Disorders ◽  
Communication Disorders ◽  
Sixth Grade ◽  
Sex Bias ◽  
Classroom Teachers ◽  
Communication Disorder ◽  
Primary Procedure ◽  
Teacher Referrals ◽  
Grade Classroom

Kindergarten through sixth grade classroom teachers in four school districts completed questionnaires designed to determine whether they would be more likely to refer a boy than a girl with an identical communication disorder. The teachers were found to be equally likely to refer a girl as a boy who presented a disorder of articulation, language, or voice, but they were more likely to refer a boy for speech-language remediation who presented the disorder of stuttering. The tendency for the teachers to allow the sex of a child to influence their likelihood of referral for stuttering remediation, to overlook a sizeable percentage of children with chronic voice disorders, and to be somewhat inaccurate generally in their referrals suggests that teacher referrals are best used as an adjunct to screening rather than as a primary procedure to locate children with communication disorders.

Test Validation Without Measurement

2016 ◽  
Vol 32 (3) ◽  
pp. 204-214 ◽  
Author(s):  
Emilie Lacot ◽  
Mohammad H. Afzali ◽  
Stéphane Vautier
Keyword(s):  
Test Data ◽  
Test Scores ◽  
Scientific Explanation ◽  
Test Validation ◽  
Clinical Tests ◽  
Ethical Perspective ◽  
Power Of Test ◽  
Memory Accuracy ◽  
Social Uses ◽  
Special Case

Abstract. Test validation based on usual statistical analyses is paradoxical, as, from a falsificationist perspective, they do not test that test data are ordinal measurements, and, from the ethical perspective, they do not justify the use of test scores. This paper (i) proposes some basic definitions, where measurement is a special case of scientific explanation; starting from the examples of memory accuracy and suicidality as scored by two widely used clinical tests/questionnaires. Moreover, it shows (ii) how to elicit the logic of the observable test events underlying the test scores, and (iii) how the measurability of the target theoretical quantities – memory accuracy and suicidality – can and should be tested at the respondent scale as opposed to the scale of aggregates of respondents. (iv) Criterion-related validity is revisited to stress that invoking the explanative power of test data should draw attention on counterexamples instead of statistical summarization. (v) Finally, it is argued that the justification of the use of test scores in specific settings should be part of the test validation task, because, as tests specialists, psychologists are responsible for proposing their tests for social uses.

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