Showing Records: 41 - 50 of 253
14 (38), Thomson to Ledermann, 6 Mar 1938
15 (37), Thomson to Ledermann, 16 Aug 1937
Thomson informs Ledermann that he has submitted his paper to the British Journal of Psychology, and has included a referral to a future article of Ledermann's.
15 (38), Thomson to Ledermann, 8 Mar 1938-9 Mar 1938
Thomson discusses some areas of uncertainty he has regarding making back estimates of the scores z from the first few Hotelling factors, referring to Bartlett's estimates of the Thurstone common factors.
Thomson asks Ledermann whether the back estimates using the Hotelling method or Bartlett-Thurstone method are best. He has added a short post script at the end of his letter the next day stating M S Bartlett's method is best.
16 (37), Ledermann to Thomson, 18 Aug 1937
16 (38), Thomson to Ledermann, 9 Mar 1938
Thomson informs Ledermann that Burt, Spearman, and Myers are to be the other speakers at the Royal Society discussion he is participating in, and that he has asked if Ledermann and Emmett may attend as guests.
He refers to a geometrical discussion of Bartlett's form of estimation which he originally sent with the letter for Ledermann's comments. This has not survived in the collection.
17 (37), Thomson to Ledermann, 25 Aug 1937
Thomson informs Ledermann that he has sent Ledermann's paper to the British Journal of Psychology, with some minor corrections. He tells Ledermann he should take some time off when his Mother visits him, and apologises for not being able to invite him to Glenapp.
Also includes a manuscript, numbered 17a (37) which Thomson sets a problem for Ledermann, asking him in his letter if he can provide a proof.
17 (38), Thomson to Ledermann, 13 Mar 1938
18 (37), Thomson to Ledermann, 29 Aug 1937
Thomson thanks Ledermann for his response to his previous letter, stating how neat his proofs are and discussing them at length. He refers to a paper of Aitken's published in the Edinburgh Mathematics Society, series 2, vol. 4, part II, and explores how the formula therein can assist them. The letter is unsigned, so appears to be incomplete.
18 (38), Thomson to Ledermann, 31 Mar 1938
Thomson asks Ledermann for a simple explanation of how Thurstone rotates the axis to the position of simple structure for use in The Factorial Analysis of Human Ability.
19 (37), Thomson to Ledermann, 14 Sept 1937
Thomson stresses that he does not wish Ledermann to reply to the letter while his Mother is visiting. He refers to a manuscript he sent Ledermann regarding the connection between estimation and selection, outlining a point he can add to it and referring to matrices of Aitken's.
He discusses orthogonal projection, estimation of regression, the selection formulae, and how these can be seen as one; as well as the division of factorial analysis after selection into two parts.