Essays about: "auxiliary variable "

Found 5 essays containing the words auxiliary variable .

  1. 1. System Identification of continuous-time systems with quantized output data using indirect inference

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Frida Persson; [2021]
    Keywords : System Identification; Indirect Inference; Continuous-Time Systems; Identification of Non- Linear systems; Hammerstein system.; Systemidentifiering; Tidskontinuerliga system; Icke-linjära system; Hammerstein system.;

    Abstract : Continuous-time system identification is an important subject with applications within many fields. Many physical processes are continuous in time. Therefore, when identifying a continuous-time model, we can use our insight into the system to decide the system structure and have a direct interpretation of the parameters. READ MORE

  3. 2. An Error Analysis of Subject-Verb Agreement by Swedish Learners of English : Corpus-Based Study of the Difficulties Surrounding Subject-Verb Agreement for Swedish Students

    University essay from Högskolan i Gävle/Avdelningen för humaniora

    Author : Viktor Molin; [2020]
    Keywords : Error Analysis; SLA; Swedish; ELT; Subject-Verb Agreement;

    Abstract : This study investigates subject-verb agreement errors produced by students in upper secondary school in Sweden. The research was conducted in an attempt to understand why students acquiring English as their L2 struggle with learning subject-verb agreement, and to categorize the grammatical environments which cause students to produce errors related to subject-verb agreement. READ MORE

  4. 3. Direct optimization of dose-volume histogram metrics in intensity modulated radiation therapy treatment planning

    University essay from KTH/Skolan för teknikvetenskap (SCI)

    Author : Tianfang Zhang; [2018]
    Keywords : Optimization; intensity-modulated radiation therapy; DVH functions; dose-at-volume; volume-at-dose; value-at-risk; smooth approximation; kernel density estimation; fluence map optimization; Optimering; intensitetsmodulerad strålterapi; DVH-funktioner; dose-at-volume; volumeat- dose; value-at-risk; slätapproximation; ickeparametrisk skattning; fluensoptimering;

    Abstract : In optimization of intensity-modulated radiation therapy treatment plans, dose-volumehistogram (DVH) functions are often used as objective functions to minimize the violationof dose-volume criteria. Neither DVH functions nor dose-volume criteria, however,are ideal for gradient-based optimization as the former are not continuously differentiableand the latter are discontinuous functions of dose, apart from both beingnonconvex. READ MORE

  5. 4. Optimal Auxiliary Variable Assisted Two-Phase Sampling Designs.

    University essay from Göteborgs universitet/Institutionen för matematiska vetenskaper

    Author : Henrik Imberg; [2016-06-22]
    Keywords : Anticipated variance; Auxiliary information in design; Maximum pseudolikelihood; Optimal designs; Poisson sampling; Two-phase sampling;

    Abstract : Two-phase sampling is a procedure in which sampling and data collection is conducted in two phases, aiming at achieving increased precision in estimation at reduced cost. The rst phase typically involves sampling a large number of elements and collecting data on variables that are easy to measure. READ MORE

  6. 5. Auxiliary variables a weight against nonresponse bias : A simulation study

    University essay from Stockholms universitet/Statistiska institutionen

    Author : Mattias Lindberg; Peter Guban; [2014]
    Keywords : Nonresponse; MAR; MCAR; MNAR; nonresponse bias; estimator; indicator; auxiliary variable ;

    Abstract : Today’s surveys face a growing problem with increasing nonresponse.  The increase in nonresponse rate causes a need for better and more effective ways to reduce the nonresponse bias.  There are three major scientific orientation of today’s research dealing with nonresponse. READ MORE