code: function _isAnalysisPartOfOtherAnalyses (analysis, analysisList) {
    return _.any(analysisList, function (otherAnalysisModel) {
      if (!analysis.equals(otherAnalysisModel)) {
        return otherAnalysisModel.findAnalysisById(analysis.get('id'));
      }
      return false;
    });
  }
docs: Check if an analysis is referenced by other anylisis in the given
  analysis collection.