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1 (37), Thomson to Ledermann, 2 Feb 1937

 Item
Identifier: Coll-1064/1
Scope and Contents

Thomson acknowledges receipt of Ledermann's letter and manuscript, expressing pleasure at Ledermann's continuing interest in factor analysis.

Thomson draws parallels between a formula Ledermann uses and the work of Kelley, specifically his pentad criterion as discussed in Crossroads in the Mind of Man.

Dates: 2 Feb 1937
Found in: University of Edinburgh Library Heritage Collections

1 (38), Thomson to Ledermann, 1 Jan 1938

 Item
Identifier: Coll-1064/34
Scope and Contents

Thomson asks Ledermann to explain an article of C Spearman's. The unnamed article is referred to in Spearman's The Abilities of Man, and regards the reversibility of proof of Spearman's tetrad criterion.

Dates: 1 Jan 1938
Found in: University of Edinburgh Library Heritage Collections

1 (39), Ledermann to Thomson, and Thomson to Ledermann, 25 Apr 1939-26 Apr 1939

 Item
Identifier: Coll-1064/81
Scope and Contents In Ledermann's letter to Thomson, dated 25 Apr 1939, he informs Thomson of his applying for the Carnegie Teaching Fellowship, which would allow him to undertake original research in the areas of pure matrix algebra and abstract group theory. He also mentions that he would like to devote some time to applied mathematics, specifically factor analysis, and asks Thomson for permission to continue the work he undertook as Thomson's assistant, perhaps with the help of...
Dates: 25 Apr 1939-26 Apr 1939
Found in: University of Edinburgh Library Heritage Collections

1 (40), Thomson to Ledermann, 30 Jan 1940

 Item
Identifier: Coll-1064/94
Scope and Contents

Thomson invites Ledermann to dinner.

Dates: 30 Jan 1940
Found in: University of Edinburgh Library Heritage Collections

2 (37), Thomson to Ledermann, 10 Feb 1937

 Item
Identifier: Coll-1064/2
Scope and Contents

Thomson acknowledges receipt of Kelley's book, Crossroads in the Minds of Man. He advises Ledermann with regards to referencing Kelley's pentad criterion in his paper, while still recognising Ledermann's shorter method for arriving at the same result.

Thomson cites Psychometrika as the best publication for the paper, and offers to send it there if Ledermann is in agreement.

Dates: 10 Feb 1937
Found in: University of Edinburgh Library Heritage Collections

2 (38), Thomson to Ledermann, 10 Jan 1938

 Item
Identifier: Coll-1064/35
Scope and Contents

Thomson refers to a letter he was planning on sending to Nature, which was originally enclosed but has not survived in the collection. He asks Ledermann to check the letter, and post it if it is correct.

Dates: 10 Jan 1938
Found in: University of Edinburgh Library Heritage Collections

2 (39), Thomson to Ledermann, Ledermann to Thomson, 19 Jun 1939-24 Jun 1939

 Item
Identifier: Coll-1064/82
Scope and Contents In Thomson's letter to Ledermann, dated 19 Jun 1939, he apologises for not replying to an earlier letter of Ledermann's and informs him that he will be happy to send him any of the letters he has written regarding his work from the last year, asking him to specify the subjects he is interested in. In his reply, dated 24 Jun 1939, Ledermann tells Thomson that he would like to look at the problem of maximising and minimizing the specifics, and that he has...
Dates: 19 Jun 1939-24 Jun 1939
Found in: University of Edinburgh Library Heritage Collections

2 (40), Thomson to Ledermann, 16 Feb 1940

 Item
Identifier: Coll-1064/95
Scope and Contents

Thomson compliments Ledermann's article in Proceedings of the Royal Society of Edinburgh, but points out what he thinks is a misprint.

Dates: 16 Feb 1940
Found in: University of Edinburgh Library Heritage Collections

3 (37), Thomson to Ledermann, 16 Feb 1937

 Item
Identifier: Coll-1064/3
Scope and Contents

Thomson informs Ledermann that his secretary, Miss Matthews, is typing three copies of Ledermann's paper in order to submit to Psychometrika, and that these will be sent to him should he wish to make any changes before admission.

Thomson advises that he need not simplify the paper.

Dates: 16 Feb 1937
Found in: University of Edinburgh Library Heritage Collections

3 (38), Thomson to Ledermann, 27 Jan 1938

 Item
Identifier: Coll-1064/36
Scope and Contents

Thomson asks Ledermann to tidy his proof regarding Bartlett's estimation of the common factors and put it into more mathematical terms. He attaches the proof for Ledermann's consideration.

Dates: 27 Jan 1938
Found in: University of Edinburgh Library Heritage Collections

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  • Names: Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh) X

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Spearman, Charles Edward, 1863-1945 (psychologist) 1
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