Showing Records: 51 - 60 of 253
Item
Identifier: Coll-1064/52
Scope and Contents
Thomson asks Ledermann for his advice regarding his chapter on Boundary Conditions, specifically the rule that if the largest latent root comes between s and (s+1), then s-factors are inadequate, showing Ledermann the examples he is planning on using in the chapter. Ledermann has added answers to calculations in red pencil. Thomson also asks Ledermann about Thurstone’s iterative process for finding the...
Dates:
31 Mar 1938
Item
Identifier: Coll-1064/18
Scope and Contents
Thomson writes to Ledermann regarding the method of sums of differences, which Thomson uses frequently in his work but with which Ledermann is unfamiliar. He refers Ledermann to a 1909 paper of Spearman's in which the method was first used, and explains the form of the method he himself has used since, which he refers to as the pooling square. He goes on to discuss Hotelling's paper on the most predictable...
Dates:
15 Sept 1937
Item
Identifier: Coll-1064/53
Scope and Contents
Thomson gives Ledermann instructions regarding a matrix and the centroid process.
Dates:
6 Apr 1938
Item
Identifier: Coll-1064/19
Scope and Contents
Thomson thanks Ledermann for his letters, and discusses his study of the problem of estimation, referring to the work of Bartlett. He also informs Ledermann that he has ordered Darmois' book, Methodes d’ Estimation, and asks him if he thinks it worthwhile buying a copy of Cullis’ Matrices and Determinoids. Thomson advises Ledermann to keep account of postage and expenditure so he can be reimbursed for these, and informs him of his whereabouts for the...
Dates:
26 Sept 1937
File
Identifier: Coll-1064/55
Scope and Contents
In the first letter, dated 12 Apr 1938 and numbered 21 (38), Thomson tells Ledermann about his trip to Dumfries and the Galloway coast, informing him of his travel plans for the next few weeks which include going to Munich and Vienna. He asks Ledermann to undertake editing work on The Factorial Analysis of Human Ability, in particular ensuring a second manuscript is up to date. Thomson also refers to the mathematical appendix he has...
Dates:
12 Apr 1938-21 May 1938
Item
Identifier: Coll-1064/20
Scope and Contents
Thomson discusses M S Bartlett's proposed method of estimating factors as given in his British Journal of Psychology articles of Oct 1935 and Jul 1937. Thomson interprets the method, with the letter containing several pages of working for Ledermann's comments.
Dates:
30 Sept 1937
Item
Identifier: Coll-1064/56
Scope and Contents
Thomson acknowledges receipt of the manuscript of The Factorial Analysis of Human Ability from Ledermann, thanks him for correcting and sending proofs to the Journal of Educational Psychology and the British Journal of Psychology, and asks him to ensure he has ordered off prints.
He refers briefly to the weather during his travels in Munich and Stockholm.
Dates:
25 May 1938
Item
Identifier: Coll-1064/21
Scope and Contents
Postscript following on from Thomson's previous letter in which he expounds further upon his interpretation of M S Bartlett's proposed method of estimating factors.
Dates:
1 Oct 1937
File
Identifier: Coll-1064/57
Scope and Contents
Contains short letter from Thomson thanking Ledermann for the return of a manuscript copy of The Factorial Analysis of Human Ability, and pointing out an error in his formula; a post script from Thomson regarding an error in Burt's matrix; and a post script from Thomson regarding Ledermann's notes about when a Heywood battery becomes impossible.
Dates:
29 May 1938-30 May 1938
Item
Identifier: Coll-1064/22
Scope and Contents
Thomson discusses his way of calculating what values may be given to the elements of Vpp in a hierarchical matrix, illustrating this with several pages of working for Ledermann's comment.
Dates:
4 Oct 1937
