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The " Rasch model " , named after Georg Rasch , is a psychometric model for analyzing categorical data , such as answers to questions on a reading assessment or questionnaire responses , as a function of the trade-off between ( a ) the respondent 's abilities , attitudes , or personality traits and ( b ) the item difficulty .
 Georg Rasch
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Georg Rasch