i dont agree with the solutions.

[sam0001]

what are you guys getting for this answer?

[oneialex]

D, from solving for the total number keeping their votes with the same party (400).

[sam0001]

Me too. But the answer is c?

[dfgjgddjidfg]

which exam is this

[sam0001]

Mav 2012

[oneialex]

Me too. But the answer is c?

Must be missing something important from the question. I assumed that the order of the elements in each row and column go from Labour to Liberal to Other. Perhaps this isn't necesarily the case, or isn't the way that the question should be viewed?

[dfgjgddjidfg]

in the worked solutions they uses matrix mutiplication

[oneialex]

in the worked solutions they uses matrix mutiplication

Ah, makes sense. It's the logical thing to do. My bad.

[Will T]

I got the same answer as oneialex....

It's 200? And it doesn't seem to matter how you order it. (I've tried Labour, Liberal, Other and Liberal, Labour, Other and it gets the same answer, a definite 200). I've also drawn it as a transition network (3 vertices), and I am still getting 200.

[oneialex]

I got the same answer as oneialex....

It's 200? And it doesn't seem to matter how you order it. (I've tried Labour, Liberal, Other and Liberal, Labour, Other and it gets the same answer, a definite 200). I've also drawn it as a transition network (3 vertices), and I am still getting 200.

I tried multiplying the given matrix with a 3x1 matrix containing the values 300, 200 and 100. That gave the values 210, 250 and 140. I added the difference between the new values and the old values (90+50+40), which gave 180. It was more-or-less experimentation on my part, I must admit though.

[TheRajinator]

wait how are you solving this question? I multiplied the transition matrix with the column matrix and got 210, 250, 140. Where would we go from there?

[oneialex]

wait how are you solving this question? I multiplied the transition matrix with the column matrix and got 210, 250, 140. Where would we go from there?

To clear up what I said from my above post, I checked the differences between the new values and the original values (e.g. 300-210=90, 250-200=50, 140-100=40), then added them to give 180. I'm assuming that method is fine? I'm not 100% sure on it.

[Will T]

wait how are you solving this question? I multiplied the transition matrix with the column matrix and got 210, 250, 140. Where would we go from there?

To clear up what I said from my above post, I checked the differences between the new values and the original values (e.g. 300-210=90, 250-200=50, 140-100=40), then added them to give 180. I'm assuming that method is fine? I'm not 100% sure on it.

I just tried that with a 3 x 1 matrix containing elements 200;300;100 respectively. I added the differences between those and the original figures and I got 80. The matrix product was 160;310;130. So 40 + 10 + 30 = 80. Therefore, I think we need a different method, as the question doesn't specify which parties are migrating to which parties and this result is incongruent with yours and there would be 4 other ways of ordering the numbers 300, 200, 100 and I imagine some would also have values that are incongruent to 180.

[oneialex]

wait how are you solving this question? I multiplied the transition matrix with the column matrix and got 210, 250, 140. Where would we go from there?

To clear up what I said from my above post, I checked the differences between the new values and the original values (e.g. 300-210=90, 250-200=50, 140-100=40), then added them to give 180. I'm assuming that method is fine? I'm not 100% sure on it.

I just tried that with a 3 x 1 matrix containing elements 200;300;100 respectively. I added the differences between those and the original figures and I got 80. The matrix product was 160;310;130. So 40 + 10 + 30 = 80. Therefore, I think we need a different method, as the question doesn't specify which parties are migrating to which parties and this result is incongruent with yours and there would be 4 other ways of ordering the numbers 300, 200, 100 and I imagine some would also have values that are incongruent to 180.

Fair call on that one. 

[astone788]

easy stuff. Help me with TriG some1!!