How to remove Analysis button from Webform results tab
The best way to hide menu item from the secondary tabs should be to alter the access callback of the menu item.

function yourmodule_menu_alter(&amp;$item) {
  // This hides the analysis item. Others should work simillary.
  $item['node/%webform_menu/webform-results/analysis']['access callback'] = 'yourmodule_webform_result_access';
}

function yourmodule_webform_result_access($node, $account = NULL) {
  // You can put here any custom logic of your needs.
  return FALSE; 
}