OK, As promised I took a quick look at whatever screenshot you were using to arrive at conclusion that Wasim is more efficient in taking top 6 and tails both when compared to McGrath.
Two major flaws the way you are using that screenshot. Here is link for your screenshot which prompted some other posters to think that you were making it up (about Wasim's efficiency to take wickets at each batting position) but you simply misunderstood and I don't think it was too much of your fault.
http://www.pakpassion.net/ppforum/showpost.php?p=5807895&postcount=394
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First Flaw: Wasim's efficiency is not reflected there for block of 1-6 batsmen or RHB or LHB.
Your screenshots doesn't tell anything about how many runs Wasim gave while dismissing those batsmen ( RHB, LHB, 1st position, 2nd position ..... ). It doesn't tell you anything about Wasim efficiency in dismissing those batsmen. It only tells you the average score of each batsmen when they were dismissed.
In your screenshot, Wasim has below 20 avg listed for RHB & LHB, both. If he gave sub 20 runs to take wickets against Right hand bats and also sub 20 runs to take wickets against left hand bats then
his career average for taking each wicket should have been sub 20 but that's not that case. So your screenshot doesn't show how many runs Wasim gave to take those wickets ( RHB, LHB, 1st position, 2nd position .....)
I can see why you got confused here. Cricinfo should have been more clear while putting such headers but if you hover your mouse on top of 'avg' you will notice the description. It says average score upon dismissal.
You clearly have some issues understanding English, because everything you posted is absolutely wrong.
Do you even know what the word Average means?
The meaning of "Average score upon dismissal" is the average of the number of runs that the Batsmen scored against Wasim before getting out.
If he averages 28 runs, than that means that he took his wickets after giving away 28 runs?
Do you have some problem understanding English?
Do you know what the word "Score" means?
Score as in runs, meaning that if Wasim averages 14 than on an average he gave away 14 runs before he took the wicket?
If you actually used your brain before posting this, you would have realized that, "Average score upon dismissal" means the runs the Batsman had scored against Wasim before he got him out.
And the "CAREER BOWLING AVERAGE" in Wasim's case which is 23 reflects the same thing because,
Bowling average = Runs conceded/Wickets taken = Runs Conceded per Wicket.
Please do try to use your brain before posting, you will save yourself a lot of time and embarrassment.
Do you perhaps understand such a simple concept explained in simple English now?
Second Flaw - An average of average should never be used even if you know how many runs Wasim gave for each wickets at different batting positions. We have two blocks of wickets here. 1-6 and then tails. You can't use average of average to determine how cheaply McGrath and Wasim took wickets in two blocks. Why? Let me explain you with one simple example.
Example to show why we shouldn't use average of average:
A bowler takes , only 1 wicket each for batting position 1-5. He takes 95 wickets at batting position 6. He has total 100 wickets for batting position 1-6.
1 wicket at avg of 10 for batting position 1
1 wicket at avg of 10 for batting position 2
1 wicket at avg of 10 for batting position 3
1 wicket at avg of 10 for batting position 4
1 wicket at avg of 10 for batting postion 5
95 wicket at avg of 20 for batting position 6
Average of average will give you misleading idea that 100 wickets of block 1-6 was taken at an average of (10+10+10+10+10+20) / 6 = 11.66. In reality situation is lot different. Bowler gave total 1950 runs to get 100 wickets in 1-6 block. His each wicket in block 1-6 costed 19.50. To see how cheaply bowler took wickets, we need to take total runs and total wickets for block of 1-6 batting order.
So average of average is not meaningful at all. I used extreme example to make my point but it still holds true if you have some different distribution of wickets in each batting position. This point is a mute point due to screenshot having first flaw but just pointing out why we should not use it.
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I was only pointing out that It's not possible for Wasim to be more efficient in picking top 6 + tails , both than McGrath otherwise Wasim would have had better career record. I didn't even had to look at anything else to make that statement.
I patiently looked at your screenshot to find out why you were confused. I tried my best to explain it to you as well. If you have any question here, just ask and I will try to answer it but more often than not most people don't have that much time to explain line by line. You don't want to offer an apology then it's fine but in future don't accuse people for doing random things due to mistake of mixing posters.
Please, i don't think you are capable of answering any question, your posts are full of baloney.
If anything you need some help understand English.
I'll try me best to explain it to you.
The word efficiency means how cheaply a Batsman got a bowler out, the word EFFICIENCY OR HOW CHEAPLY HE GOT THE BATSMAN OUT HAS NOTHING TO DO WITH THE AMOUNT OF BATSMAN HE GOT OUT.
When you say how cheaply Wasim got a Batsman out you see how much runs he conceded before getting them out, there is no link whatsoever to the number of times he got them out.
Say
Bowler A gets the Top 3 Batsmen out 10 times like this,
Number 1. 1 wicket for 30 runs, average = 30
Number 2. 4 wicket for 120 runs, average = 30
Number 3. 5 wickets for 1 run, average= 0.50
His average of averages is 20.16
Bowler B gets the Top Batsmen out 100 times like this.
Number 1. 50 wickets, 1000 runs, average = 20
Number 2. 20 wickets 500 runs, average= 25
Number 3. 30 wickets 500 runs, average= 16.67
Average of averages= 20.5.
As you can see it tells us accurately that Bowler A was more efficient even though Bowler B averaged better than him against 2 Batsmen, but Bowler A was much better against the Third and that difference was enough to make up for the other 2 and thus he averaged better than him.
Bowler B gets the Top 3 Batsmen out 1000 times giving away 100000 runs he averages 100 against them.
Bowler A will be considered more efficient against the Top 3 as he got them out cheaply whereas Bowler B got more wickets he conceded more runs.
And The average of the averages against the Top 6 means the Average number of runs that a Bowler conceded on average against the Top 6.
What you have shown by this post is a complete lack of knowledge and also that you are unable to comprehend simple English.
Try and read what you post before you post, you'll save yourself some time and respect.