Visually or Systematically?
For visual you will need to edit the script part where it draws the parameters onto the screen.
The default code is under Window_Base,
look for
def draw_actor_param(actor, x, y, param_id)
change_color(system_color)
draw_text(x, y, 120, line_height, Vocab:

aram(param_id))
change_color(normal_color)
draw_text(x + 120, y, 36, line_height, actor.param(param_id), 2)
end
and add
return if param_id == (put the parameter id you want the script to ignore here)
right below the def method before other codes.
eg
def draw_actor_param(actor, x, y, param_id)
return if param_id == 4
return if param_id == 5
change_color(system_color)
draw_text(x, y, 120, line_height, Vocab:

aram(param_id))
change_color(normal_color)
draw_text(x + 120, y, 36, line_height, actor.param(param_id), 2)
end
To remove the parameter systematically will require you to edit the script part under Game_BattlerBase
You should be able to find the method definitions there for each parameters in there. Simply comment it out(add # infront) will do.
eg
# def mat; param(4); end
# def mdf; param(5); end
But note that if you have other scripts that need the method or is scanning/looking for it in any script calls, the game will crash. So make sure you remove all related codes that point to them as well.