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From: Sharing the Jazz on 13 Jun 2010 18:53
Hi,
I import a dataset of three variable from excel to mathematica. The
input works but i don't know how to work on it, for example plot it,
analyze stationarity. The problem is that they are on this form and
Mathematica (with Time Series application) doesn't work.

{{{"Year", "Price", "Dividend"}}, {{1871., 77.2276,
4.52234}}, {{1872., 83.2615, 4.51085}}, ..... {{2009., 888.75,
28.7598}}}

Can someone help me in start using this data?

Thank you very much,

Matteo
HEC-Paris

From: Christopher Arthur on 15 Jun 2010 02:27
Probably the double braces are confusing the program.
try this:

Flatten/@data

and use the result (such that 'data' is the entire spreadsheet).

Chris

Sharing the Jazz a =E9crit :
> Hi,
> I import a dataset of three variable from excel to mathematica. The
> input works but i don't know how to work on it, for example plot it,
> analyze stationarity. The problem is that they are on this form and
> Mathematica (with Time Series application) doesn't work.
>
> {{{"Year", "Price", "Dividend"}}, {{1871., 77.2276,
> 4.52234}}, {{1872., 83.2615, 4.51085}}, ..... {{2009., 888.75,
> 28.7598}}}
>
> Can someone help me in start using this data?
>
> Thank you very much,
>
> Matteo
> HEC-Paris
>
>
>


From: Sjoerd C. de Vries on 15 Jun 2010 02:28
Hi Matteo,

First you have to throw away the text headers using Drop or Take.

Are you sure that each data triplet has two sets of curly brackets
around it? It looks unusual, not what I normally get when I import
from Excel. Assuming you put the rest of the dataset in the variable
data I'd suggest getting rid of the extra layer of brackets using
Flatten:

data = Flatten[data, 1]

If you want to plot Price against Year you could use ListPlot or
DateListPlot as follows:

ListPlot[Transpose[{ data[[All,1]], data[[All,2]] } ] .

data[[All,1]] takes the first column of the dataset and data[[All,2]]
takes the second. Putting them in a new list with { } and using
Transpose makes it a list with data pairs.

An alternative approach would be:

ListPlot[Transpose[{ Transpose[data][[1]], Transpose[data][[1]] } ]

Cheers -- Sjoerd

On Jun 14, 12:53 am, Sharing the Jazz <formenti.mat...(a)gmail.com>
wrote:
> Hi,
> I import a dataset of three variable from excel to mathematica. The
> input works but i don't know how to work on it, for example plot it,
> analyze stationarity. The problem is that they are on this form and
> Mathematica (with Time Series application) doesn't work.
>
> {{{"Year", "Price", "Dividend"}}, {{1871., 77.2276,
> 4.52234}}, {{1872., 83.2615, 4.51085}}, ..... {{2009., 888.75,
> 28.7598}}}
>
> Can someone help me in start using this data?
>
> Thank you very much,
>
> Matteo
> HEC-Paris


From: sibir on 15 Jun 2010 02:30
You have to get rid of some curly brackets, e.g. with Flatten

In[1]:= t={{{"Year","Price","Dividend"}},{{1871.,77.2276,4.52234}},
{{1872.,83.2615,4.51085}},{{2009.,888.75,28.7598}}};

In[2]:= Flatten[t,1]

Out[2]= {{Year,Price,Dividend},{1871.,77.2276,4.52234},
{1872.,83.2615,4.51085},{2009.,888.75,28.7598}}

From: Bob Hanlon on 15 Jun 2010 02:31

dateFromYear[dyr_?NumericQ] :=
Module[{yr = IntegerPart[dyr]},
DatePlus[{yr, 1, 1},
FractionalPart[dyr]*
DateDifference[
{yr, 1, 1},
{yr + 1, 1, 1}]]]

data = {
{{"Year", "Price", "Dividend"}},
{{1871., 77.2276, 4.52234}},
{{1872., 83.2615, 4.51085}},
{{2009., 888.75, 28.7598}}};

{year, price, dividend} =
Rest /@ Transpose[Flatten[data, 1]];

ListLinePlot[Thread[{year, price}]]

DateListPlot[
Thread[{
dateFromYear /@ year,
price}],
Joined -> True]

FindFit[Thread[{year, price}],
a + m*(yr - year[[1]]), {a, m}, yr]

{a->77.3042,m->5.88005}

ListLinePlot[Thread[{year, dividend}]]

DateListPlot[
Thread[{
dateFromYear /@ year,
dividend}],
Joined -> True]

FindFit[Thread[{year, dividend}],
a + m*(yr - year[[1]]), {a, m}, yr]

{a->4.42878,m->0.176307}


Bob Hanlon

---- Sharing the Jazz <formenti.matteo(a)gmail.com> wrote:

=============
Hi,
I import a dataset of three variable from excel to mathematica. The
input works but i don't know how to work on it, for example plot it,
analyze stationarity. The problem is that they are on this form and
Mathematica (with Time Series application) doesn't work.

{{{"Year", "Price", "Dividend"}}, {{1871., 77.2276,
4.52234}}, {{1872., 83.2615, 4.51085}}, ..... {{2009., 888.75,
28.7598}}}

Can someone help me in start using this data?

Thank you very much,

Matteo
HEC-Paris


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