checkRd: (-1) GAabbreviate.Rd:53: Lost braces; missing escapes or markup?
    53 | where \eqn{I} represents a user-specified fixed item cost, \eqn{k} represents the number of items retained by the GA (in any given iteration), \eqn{s} is the number of subscales in the measure, \eqn{w_i} are the weights (by default {w_i = 1} for any \eqn{i}) associated with each subscale (if there are any subsets to be retained), and \eqn{R_i^2} is the amount of variance in the ith subscale that can be explained by a linear combination of individual item scores. Adjusting the value of \eqn{I} low or high yields longer or shorter measures respectively. When the cost of each individual item retained in each generation outweighs the cost of a loss in explained variance, the GA yields a relatively brief measure. When the cost is low, the GA yields a relatively longer measure maximizing explained variance (Yarkoni, 2010).  
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Invalid package aliases in Rd file 'GAabbreviate-internal.Rd':
  ‘GAabbreviation-package’
checkRd: (-1) GAabbreviate.Rd:53: Lost braces; missing escapes or markup?
    53 | where \eqn{I} represents a user-specified fixed item cost, \eqn{k} represents the number of items retained by the GA (in any given iteration), \eqn{s} is the number of subscales in the measure, \eqn{w_i} are the weights (by default {w_i = 1} for any \eqn{i}) associated with each subscale (if there are any subsets to be retained), and \eqn{R_i^2} is the amount of variance in the ith subscale that can be explained by a linear combination of individual item scores. Adjusting the value of \eqn{I} low or high yields longer or shorter measures respectively. When the cost of each individual item retained in each generation outweighs the cost of a loss in explained variance, the GA yields a relatively brief measure. When the cost is low, the GA yields a relatively longer measure maximizing explained variance (Yarkoni, 2010).  
       |                                                                                                                                                                                                                                         ^
Invalid package aliases in Rd file 'GAabbreviate-internal.Rd':
  ‘GAabbreviation-package’
checkRd: (-1) GAabbreviate.Rd:53: Lost braces; missing escapes or markup?
    53 | where \eqn{I} represents a user-specified fixed item cost, \eqn{k} represents the number of items retained by the GA (in any given iteration), \eqn{s} is the number of subscales in the measure, \eqn{w_i} are the weights (by default {w_i = 1} for any \eqn{i}) associated with each subscale (if there are any subsets to be retained), and \eqn{R_i^2} is the amount of variance in the ith subscale that can be explained by a linear combination of individual item scores. Adjusting the value of \eqn{I} low or high yields longer or shorter measures respectively. When the cost of each individual item retained in each generation outweighs the cost of a loss in explained variance, the GA yields a relatively brief measure. When the cost is low, the GA yields a relatively longer measure maximizing explained variance (Yarkoni, 2010).  
       |                                                                                                                                                                                                                                         ^
Invalid package aliases in Rd file 'GAabbreviate-internal.Rd':
  ‘GAabbreviation-package’
checkRd: (-1) GAabbreviate.Rd:53: Lost braces; missing escapes or markup?
    53 | where \eqn{I} represents a user-specified fixed item cost, \eqn{k} represents the number of items retained by the GA (in any given iteration), \eqn{s} is the number of subscales in the measure, \eqn{w_i} are the weights (by default {w_i = 1} for any \eqn{i}) associated with each subscale (if there are any subsets to be retained), and \eqn{R_i^2} is the amount of variance in the ith subscale that can be explained by a linear combination of individual item scores. Adjusting the value of \eqn{I} low or high yields longer or shorter measures respectively. When the cost of each individual item retained in each generation outweighs the cost of a loss in explained variance, the GA yields a relatively brief measure. When the cost is low, the GA yields a relatively longer measure maximizing explained variance (Yarkoni, 2010).  
       |                                                                                                                                                                                                                                         ^
Invalid package aliases in Rd file 'GAabbreviate-internal.Rd':
  ‘GAabbreviation-package’
checkRd: (-1) GAabbreviate.Rd:53: Lost braces; missing escapes or markup?
    53 | where \eqn{I} represents a user-specified fixed item cost, \eqn{k} represents the number of items retained by the GA (in any given iteration), \eqn{s} is the number of subscales in the measure, \eqn{w_i} are the weights (by default {w_i = 1} for any \eqn{i}) associated with each subscale (if there are any subsets to be retained), and \eqn{R_i^2} is the amount of variance in the ith subscale that can be explained by a linear combination of individual item scores. Adjusting the value of \eqn{I} low or high yields longer or shorter measures respectively. When the cost of each individual item retained in each generation outweighs the cost of a loss in explained variance, the GA yields a relatively brief measure. When the cost is low, the GA yields a relatively longer measure maximizing explained variance (Yarkoni, 2010).  
       |                                                                                                                                                                                                                                         ^
Invalid package aliases in Rd file 'GAabbreviate-internal.Rd':
  ‘GAabbreviation-package’
checkRd: (-1) GAabbreviate.Rd:53: Lost braces; missing escapes or markup?
    53 | where \eqn{I} represents a user-specified fixed item cost, \eqn{k} represents the number of items retained by the GA (in any given iteration), \eqn{s} is the number of subscales in the measure, \eqn{w_i} are the weights (by default {w_i = 1} for any \eqn{i}) associated with each subscale (if there are any subsets to be retained), and \eqn{R_i^2} is the amount of variance in the ith subscale that can be explained by a linear combination of individual item scores. Adjusting the value of \eqn{I} low or high yields longer or shorter measures respectively. When the cost of each individual item retained in each generation outweighs the cost of a loss in explained variance, the GA yields a relatively brief measure. When the cost is low, the GA yields a relatively longer measure maximizing explained variance (Yarkoni, 2010).  
       |                                                                                                                                                                                                                                         ^
Invalid package aliases in Rd file 'GAabbreviate-internal.Rd':
  'GAabbreviation-package'
checkRd: (-1) GAabbreviate.Rd:53: Lost braces; missing escapes or markup?
    53 | where \eqn{I} represents a user-specified fixed item cost, \eqn{k} represents the number of items retained by the GA (in any given iteration), \eqn{s} is the number of subscales in the measure, \eqn{w_i} are the weights (by default {w_i = 1} for any \eqn{i}) associated with each subscale (if there are any subsets to be retained), and \eqn{R_i^2} is the amount of variance in the ith subscale that can be explained by a linear combination of individual item scores. Adjusting the value of \eqn{I} low or high yields longer or shorter measures respectively. When the cost of each individual item retained in each generation outweighs the cost of a loss in explained variance, the GA yields a relatively brief measure. When the cost is low, the GA yields a relatively longer measure maximizing explained variance (Yarkoni, 2010).  
       |                                                                                                                                                                                                                                         ^
Invalid package aliases in Rd file 'GAabbreviate-internal.Rd':
  ‘GAabbreviation-package’