John Wolfe - Academia.edu (original) (raw)
Papers by John Wolfe
Molecular and Cellular Biology
Retroviral vectors were used to transfer genes efficiently into rat and dog myoblasts in primary ... more Retroviral vectors were used to transfer genes efficiently into rat and dog myoblasts in primary cultures under conditions which permitted the transduced myoblasts to differentiate into myotubes expressing the transferred genes. The transduced myotubes expressed normal markers of differentiation and were morphologically indistinguishable from uninfected myotubes. Retroviral vector-mediated gene transfer was also used to correct a genetic enzyme deficiency in mutant canine muscle cells.
Multivariate Behavioral Research, 1970
Military Psychology, 1997
... In conventional testing, an examinee finishes one test in a battery and waits for the time li... more ... In conventional testing, an examinee finishes one test in a battery and waits for the time limit to expire before proceeding to the next test. All the examinees finish the last test at exactly the same instant, then they enter a queue to wait for their next service, for example, a medical ...
Military Psychology, 1997
Journal of Applied Psychology, 1971
Considers that the widely used tables of H. Taylor and T. Russell (see pa, vol. 14:1111) for eval... more Considers that the widely used tables of H. Taylor and T. Russell (see pa, vol. 14:1111) for evaluating the usefulness of selection tests are inappropriate for evaluating predictors used to discriminate discrete normally distributed criterion groups where a point-biserial correlation coefficient is the proper index of validity. A set of tables is presented, similar to the taylor-russell tables, for evaluating
Samples from spherical normal distributions were generated and fitted to hypothesized mixtures of... more Samples from spherical normal distributions were generated and fitted to hypothesized mixtures of normal distributions using the 360 NORMIX computer program for maximum likelihood estimation of the parameters of a mixture of multinormal distributions with a common covariance ...
Abstract : The effectiveness of several methods of classifying enlisted men for A-school training... more Abstract : The effectiveness of several methods of classifying enlisted men for A-school training were compared using computer simulation methods. Using actual school quotas, nine different assignment methods were compared on seven assignment criteria using computer simulation methods with a sample of 587 enlisted men from NTC, San Diego. Of these men, 251 were assigned to A-school, and the remainder were assigned to the fleet. The seven criteria were: (1) aptitude test selector sums, (2) predicted final school grade, (3) probability of graduation, (4) training cost (without pay and allowances), (5) training cost with pay and allowances, (6) manning level ratio, and (7) criticality. Seven assignment strategies were used to maximize each of the above criteria. Two additional strategies were: (1) actual NTC assignment, and (2) random assignment. Random assignment was included as a base against which to evaluate improvement over chance. The average payoff on any classification criterion is best for the strategy directed toward that criterion. The present operational classification strategy is far superior to random assignment. The best overall strategy, under the conditions of the present study, is assignment to maximize the probability of graduation from A-school. This strategy comes close to maximizing the other strategies investigated, and also results in relatively homogeneous talent groupings in the various schools. Classification to maximize probability of graduation is a strategy worth further investigation. (Author)
Abstract : The objective of this report is to describe the technological opportunities for intell... more Abstract : The objective of this report is to describe the technological opportunities for intelligent CAI (ICAI) that are expected from new developments in software and hardware technology. The recent advances in software for intelligent CAI are reviewed, followed by a discussion of the advantages and disadvantages of trying to implement ICAI on time-sharing computers, personal computers, and LISP machines. (LISP is a symbol manipulation programming language used in artificial intelligence applications.) The prices of the component parts of a LISP machine are projected over a 10-year period, using trends that have been in effect in microelectronics for the last decade.
Military Psychology, 2010
The multivariate rather than the univariate range correction is used for estimating unrestricted ... more The multivariate rather than the univariate range correction is used for estimating unrestricted applicant population validities in many military test validity studies but not uniformly. A Monte Carlo approach compared the standard errors of range-corrected validities under various experimental conditions adhering to the assumptions underlying correction accuracy. The multivariate corrected validities had smaller standard errors than both the univariate-corrected validities and the unrestricted validities. We conclude that using the univariate correction could fail to reveal the most valid selection instrument and that the multivariate correction should be used when scores for relevant predictors are available for the unrestricted population.
Military Psychology, 1997
The problem addressed in this article is how to select a common battery of predictor tests for al... more The problem addressed in this article is how to select a common battery of predictor tests for all armed services schools. A technique was developed for selecting a subset of tests from a larger te...
Educational and Psychological Measurement, 1969
classification model. The latter is more compatible with the maximal utilization philosophy. It i... more classification model. The latter is more compatible with the maximal utilization philosophy. It is stated that multiple-selection models approach the classification model which is feasible only by firms having a great diversity of jobs. The review continues with discussion of the Fair Employment philosophy and the problems of bias and invasion of privacy. Following discussion of research concerning recruitment, a major part of the review deals with measures and methods useful in personnel selection. The review concludes with discussion of such sources as Dunnette’s Personnel Selection and Placement and
Procedures are described for estimating the means, covariances, and mixing proportions of a mixtu... more Procedures are described for estimating the means, covariances, and mixing proportions of a mixture of multivariate-normal distributions. First, it is shown that the maximum-likelihood estimates must satisfy a certain set of simultaneous equations. The coefficients necessary for a ...
Review of Educational Research, 1963
A large class of models descriptive of natural and behavioral phenomena can be characterized by a... more A large class of models descriptive of natural and behavioral phenomena can be characterized by an equation of the form y=F[x,/,] +e, where y is the dependent variable of particular interest, F[x,3] is a function of some variables x and parameters f/, and e is an error component. The model can be particularized in a bewildering number of ways by specifying various kinds of statistical properties of y, x, and e, and forms for F[x,/3]. For example, y and x may be random or fixed variables, and F[x,/8] may be a linear or nonlinear function (in the usual algebraic sense) of the /f. If the F[x,3] is /-nonlinear, then statistical literature terms the model nonlinear, whereas if F[x,/,] is x-nonlinear, the model is called curvilinear. Semantically, this distinction is not too clear, and it consequently has led to confusion. Nevertheless, it is very important. The equation y = i1x + /2x2+e is both /3-linear and x-linear; whereas y = /1x + f2x2 + 33x1x2+ e is /f-linear and x-nonlinear because of the term xlx2. The equation y=lx,1 +(381) (/2)x2+e is /8-nonlinear and x-linear, but y= B1X12 + (/2) (/83) 2 + e is /8-nonlinear and x-nonlinear. We have made these distinctions at some length because we find this classification system convenient for part of this review. If y= F[x,,] + e is looked at as a prediction model, it is usual to assume that y, x, and e are random variables and that F[x,,3] is 8-linear. Also, in this case, if a particular set of values for x=X is given with X and e uncorrelated, and if the elements of e have expected values of zero and if they are independently distributed with constant common variance, then the model is known as one of multiple regression. Particular care needs to be taken to select a proper regression model. Guidance in this matter is difficult to obtain; experience and professional training are the best aids. A much-needed general discussion of model
Molecular and Cellular Biology
Retroviral vectors were used to transfer genes efficiently into rat and dog myoblasts in primary ... more Retroviral vectors were used to transfer genes efficiently into rat and dog myoblasts in primary cultures under conditions which permitted the transduced myoblasts to differentiate into myotubes expressing the transferred genes. The transduced myotubes expressed normal markers of differentiation and were morphologically indistinguishable from uninfected myotubes. Retroviral vector-mediated gene transfer was also used to correct a genetic enzyme deficiency in mutant canine muscle cells.
Multivariate Behavioral Research, 1970
Military Psychology, 1997
... In conventional testing, an examinee finishes one test in a battery and waits for the time li... more ... In conventional testing, an examinee finishes one test in a battery and waits for the time limit to expire before proceeding to the next test. All the examinees finish the last test at exactly the same instant, then they enter a queue to wait for their next service, for example, a medical ...
Military Psychology, 1997
Journal of Applied Psychology, 1971
Considers that the widely used tables of H. Taylor and T. Russell (see pa, vol. 14:1111) for eval... more Considers that the widely used tables of H. Taylor and T. Russell (see pa, vol. 14:1111) for evaluating the usefulness of selection tests are inappropriate for evaluating predictors used to discriminate discrete normally distributed criterion groups where a point-biserial correlation coefficient is the proper index of validity. A set of tables is presented, similar to the taylor-russell tables, for evaluating
Samples from spherical normal distributions were generated and fitted to hypothesized mixtures of... more Samples from spherical normal distributions were generated and fitted to hypothesized mixtures of normal distributions using the 360 NORMIX computer program for maximum likelihood estimation of the parameters of a mixture of multinormal distributions with a common covariance ...
Abstract : The effectiveness of several methods of classifying enlisted men for A-school training... more Abstract : The effectiveness of several methods of classifying enlisted men for A-school training were compared using computer simulation methods. Using actual school quotas, nine different assignment methods were compared on seven assignment criteria using computer simulation methods with a sample of 587 enlisted men from NTC, San Diego. Of these men, 251 were assigned to A-school, and the remainder were assigned to the fleet. The seven criteria were: (1) aptitude test selector sums, (2) predicted final school grade, (3) probability of graduation, (4) training cost (without pay and allowances), (5) training cost with pay and allowances, (6) manning level ratio, and (7) criticality. Seven assignment strategies were used to maximize each of the above criteria. Two additional strategies were: (1) actual NTC assignment, and (2) random assignment. Random assignment was included as a base against which to evaluate improvement over chance. The average payoff on any classification criterion is best for the strategy directed toward that criterion. The present operational classification strategy is far superior to random assignment. The best overall strategy, under the conditions of the present study, is assignment to maximize the probability of graduation from A-school. This strategy comes close to maximizing the other strategies investigated, and also results in relatively homogeneous talent groupings in the various schools. Classification to maximize probability of graduation is a strategy worth further investigation. (Author)
Abstract : The objective of this report is to describe the technological opportunities for intell... more Abstract : The objective of this report is to describe the technological opportunities for intelligent CAI (ICAI) that are expected from new developments in software and hardware technology. The recent advances in software for intelligent CAI are reviewed, followed by a discussion of the advantages and disadvantages of trying to implement ICAI on time-sharing computers, personal computers, and LISP machines. (LISP is a symbol manipulation programming language used in artificial intelligence applications.) The prices of the component parts of a LISP machine are projected over a 10-year period, using trends that have been in effect in microelectronics for the last decade.
Military Psychology, 2010
The multivariate rather than the univariate range correction is used for estimating unrestricted ... more The multivariate rather than the univariate range correction is used for estimating unrestricted applicant population validities in many military test validity studies but not uniformly. A Monte Carlo approach compared the standard errors of range-corrected validities under various experimental conditions adhering to the assumptions underlying correction accuracy. The multivariate corrected validities had smaller standard errors than both the univariate-corrected validities and the unrestricted validities. We conclude that using the univariate correction could fail to reveal the most valid selection instrument and that the multivariate correction should be used when scores for relevant predictors are available for the unrestricted population.
Military Psychology, 1997
The problem addressed in this article is how to select a common battery of predictor tests for al... more The problem addressed in this article is how to select a common battery of predictor tests for all armed services schools. A technique was developed for selecting a subset of tests from a larger te...
Educational and Psychological Measurement, 1969
classification model. The latter is more compatible with the maximal utilization philosophy. It i... more classification model. The latter is more compatible with the maximal utilization philosophy. It is stated that multiple-selection models approach the classification model which is feasible only by firms having a great diversity of jobs. The review continues with discussion of the Fair Employment philosophy and the problems of bias and invasion of privacy. Following discussion of research concerning recruitment, a major part of the review deals with measures and methods useful in personnel selection. The review concludes with discussion of such sources as Dunnette’s Personnel Selection and Placement and
Procedures are described for estimating the means, covariances, and mixing proportions of a mixtu... more Procedures are described for estimating the means, covariances, and mixing proportions of a mixture of multivariate-normal distributions. First, it is shown that the maximum-likelihood estimates must satisfy a certain set of simultaneous equations. The coefficients necessary for a ...
Review of Educational Research, 1963
A large class of models descriptive of natural and behavioral phenomena can be characterized by a... more A large class of models descriptive of natural and behavioral phenomena can be characterized by an equation of the form y=F[x,/,] +e, where y is the dependent variable of particular interest, F[x,3] is a function of some variables x and parameters f/, and e is an error component. The model can be particularized in a bewildering number of ways by specifying various kinds of statistical properties of y, x, and e, and forms for F[x,/3]. For example, y and x may be random or fixed variables, and F[x,/8] may be a linear or nonlinear function (in the usual algebraic sense) of the /f. If the F[x,3] is /-nonlinear, then statistical literature terms the model nonlinear, whereas if F[x,/,] is x-nonlinear, the model is called curvilinear. Semantically, this distinction is not too clear, and it consequently has led to confusion. Nevertheless, it is very important. The equation y = i1x + /2x2+e is both /3-linear and x-linear; whereas y = /1x + f2x2 + 33x1x2+ e is /f-linear and x-nonlinear because of the term xlx2. The equation y=lx,1 +(381) (/2)x2+e is /8-nonlinear and x-linear, but y= B1X12 + (/2) (/83) 2 + e is /8-nonlinear and x-nonlinear. We have made these distinctions at some length because we find this classification system convenient for part of this review. If y= F[x,,] + e is looked at as a prediction model, it is usual to assume that y, x, and e are random variables and that F[x,,3] is 8-linear. Also, in this case, if a particular set of values for x=X is given with X and e uncorrelated, and if the elements of e have expected values of zero and if they are independently distributed with constant common variance, then the model is known as one of multiple regression. Particular care needs to be taken to select a proper regression model. Guidance in this matter is difficult to obtain; experience and professional training are the best aids. A much-needed general discussion of model