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Thomson discusses the possibility of Ledermann applying for a temporary post at Swansea, and advises him to do so.

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Thomson asks Ledermann to look at Thurstone’s Primary Mental Abilities in order to check the covariances of the estimated factors with Thomson's own, and refers him to Thurstone’s comments on Spearman's g.

Scope and Contents Thomson refers to Aitken, saying he will be interested to hear what he has to say about Ledermann's work on the connection between the formulae for selection of an infinite normal population and for the expected values in a sampling distribution. He asks Ledermann to check section 2 of chapter 14 in The Factorial Analysis of Human Ability regarding simple structure, and asks him to clear up some difficulties he is having with...

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Thomson asks Ledermann to find the latent roots of a matrix, which he reproduces, in order to check its principle axes.

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Thomson compares the latent roots Ledermann has calculated with his own, referring to Hotelling's iterative process.

Scope and Contents In the first letter dated 25 Jun 1938, Thomson thanks Ledermann for his corrections. He discusses unimodality and bimodality, vectors, and the distributions of loadings, referring to the work of Thurstone and Woodrow, as well as Ledermann's own method for finding the distribution of loadings. He also asks Ledermann if he has heard anything about his Home Office application. In the second later, dated 1 Jul 1938, Thomson asks Ledermann which part of the summer he is to have off, and...

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Thomson discusses his travels to London and the Lake District; Ledermann's enrolment as a DSc student; Ledermann's papers on automorphic matrices and boundary conditions respectively, and potential publishers for these; and hierarchical Heywood cases.

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In the first letter, dated 26 Jun 1938, Thomson explains what he means by a profile correlation, and asks Ledermann to help him solve his difficulties with this, illustrating with matrices and calculations.

In the second letter, dated 4 Jul 1938, Thomson tells Ledermann that he is sorry to hear of his Father's accident, but hopes that he will enjoy the colloquium at St Andrews and visiting his Brother in Wales.

Scope and Contents Thomson informs Ledermann that his article can be printed in Sociometrika or Psychometrika. He is unsure if the former exists and thinks it may be a typing error. Thomson mentions that he has many letters and manuscripts of Ledermann still to acknowledge. These cover topics such as boundary conditions, and Ridley Thomson's criterion. Thomson lists the letters and manuscripts with brief comments. He also discusses the...

Scope and Contents

In the first letter, dated 28 Jun 1938, Thomson discusses binomial distribution, referring to Thurstone’s Primary Mental Factors.

In the second letter, dated 16 Jul 1938, Thomson congratulates Ledermann on his new post, telling him he will miss him but wishing him good luck. He advises him to speak to the Senate regarding his DSc and try to submit in December, and tells him he hopes they can still write to one another.