ReadThe Portobello Bookshop Gift Guide 2025

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Fiction
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Contemporary & Classic Fiction Crime & Mystery Fantasy Graphic Novels & Comics Browse more Fiction categories
Non-fiction
Be it biography, history, nature writing or any other form of true story, non-fiction writing is often loaded with just as much suspense and character as the most exciting novel
Essays, Memoir & Biography Nature & Travel History & Archaeology Science & Technology Browse more Non-fiction categories
Children’s, Teenage & Educational
These stories for children and young adults will pique imaginations and inspire young readers
Children's Fiction Children's Non-Fiction Board Books, Picture Books & Activity Books Children's Poetry & Anthologies Browse more Children’s, Teenage & Educational categories
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Gift cards

Ivo W Molenaar Author

Introduction to Nonparametric Item Response Theory cover

Introduction to Nonparametric Item Response Theory

2 authors - Hardback

£133.00

Introduction to Nonparametric Item Response Theory cover

Introduction to Nonparametric Item Response Theory

2 authors - Paperback

£84.00