This section covers how to generate different types of analyses in Tableau. For example, how to do your own projections and forecasts (a lot of that material comes from Tableau v7 and earlier), some cohort analysis, etc.

Be sure to check out the following sources of material on the Tableau Community:

## Projections

### Forecasting, Run Rate and Projected Visits:

http://community.tableausoftware.com/thread/116355

projections – iterative over months, messy

http://community.tableausoftware.com/message/178156

file is: Projection Sample jtd edit.twbx

projections – easy linear trend

http://community.tableausoftware.com/thread/117629

file is: Forecast jtd edit.twbx

Another projections thread:

http://community.tableausoftware.com/thread/111437

### BYO Optimal Trend Line using table calcs

http://community.tableausoftware.com/message/180906#180906

workbook is Optimal Trend Line.twbx

Duplicate data to do funky action filter where the filtered data still shows difference from current to previous

http://community.tableausoftware.com/message/174252#174252

## Comparing dimensions

Also check out Sets, lots of possibilities there.

Comparing different dimensions (surveys, etc.)

http://kb.tableausoftware.com/articles/knowledgebase/calculating-percent-difference-across-dimensions-60

comparing items via table calc across columns:

http://kb.tableausoftware.com/articles/knowledgebase/comparing-items

Each against every other

http://drawingwithnumbers.artisart.org/comparing-each-against-each-other-the-no-sql-cross-product/

### Find complementary products- if customer purchased X, see what else the purchased

http://community.tableausoftware.com/message/171706#171706\

### Compare one against the rest

http://kb.tableausoftware.com/articles/knowledgebase/comparing-items

http://interworks.co.uk/andy-cotgreave/us-v-the-rest/

Correlation Matrix by Bora Beran

### compare given period (quarter, month, year, etc.) to the same period some time ago (year or previous)

http://community.tableausoftware.com/thread/112972

workbook is date_level_over_year_ago_or_prev.twbx

### Benford’s Rule

http://community.tableausoftware.com/thread/118570

http://en.wikipedia.org/wiki/Benfords_law

Create monthly calendar

http://vizwiz.blogspot.com/2012/05/creating-interactive-monthly-calendar.html

https://www.interworks.com/blogs/dwyers/2012/05/22/creating-calendar-views-tableau

# Quantiles

Big post on percentiles with Tableau:

http://www.equinox.co.nz/blog/Lists/Posts/Post.aspx?ID=160

From http://community.tableausoftware.com/thread/113243 by Richard Leeke:

[A] is the measure

[p] is the quantile, e.g. .25 for 25^{th}, etc.

Set compute using to [A], may need to use and advanced compute to order along the desired field.

Return only one value:

// Only calculate for first row of the partition, otherwise return NULL IF (FIRST()==0) THEN // p = 0 => minimum, and we are on the first row, so we just want the current value IF ([p] == 0) THEN ATTR([A]) // p = 1 => maximum, so lookup the last row ELSEIF ([p] == 1) THEN LOOKUP(ATTR([A]), LAST()) // otherwise select the appropriate value ELSE // The WINDOW_MIN() finds the lowest value at or beyond the required quantile. WINDOW_MIN( // required quantile is at the mid-point between two values, so take the average IF [p] * TOTAL(SUM([Number of Records])) = RUNNING_SUM(SUM([Number of Records])) THEN (ATTR([A]) + LOOKUP(ATTR([A]), 1)) / 2 // row is beyond required quantile ELSEIF [p] * TOTAL(SUM([Number of Records])) < RUNNING_SUM(SUM([Number of Records])) THEN ATTR([A]) ELSE NULL END, 0, IIF(FIRST()==0, LAST(), 0) ) END

Return same value for all rows, not including 0^{th} or 100^{th} percentile:

PREVIOUS_VALUE( IF (FIRST()==0) THEN IF ([p] == 0) THEN ATTR([A]) ELSEIF ([p] == 1) THEN LOOKUP(ATTR([A]), LAST()) ELSE WINDOW_MIN( IF [p] * TOTAL(SUM([Number of Records])) = RUNNING_SUM(SUM([Number of Records])) THEN (ATTR([A]) + LOOKUP(ATTR([A]), 1)) / 2 ELSEIF [p] * TOTAL(SUM([Number of Records])) < RUNNING_SUM(SUM([Number of Records])) THEN ATTR([A]) ELSE NULL END, 0, IIF(FIRST()==0, LAST(), 0) ) END END )

Return same value for all rows, including 0^{th} and 100^{th} percentile:

PREVIOUS_VALUE( IF (FIRST()==0) THEN IF ([p] == 0) THEN ATTR([A]) ELSEIF ([p] == 1) THEN LOOKUP(ATTR([A]), LAST()) ELSE WINDOW_MIN( IF [p] * TOTAL(SUM([Number of Records])) = RUNNING_SUM(SUM([Number of Records])) THEN (ATTR([A]) + LOOKUP(ATTR([A]), 1)) / 2 ELSEIF [p] * TOTAL(SUM([Number of Records])) < RUNNING_SUM(SUM([Number of Records])) THEN ATTR([A]) ELSE NULL END, 0, IIF(FIRST()==0, LAST(), 0) ) END END )

Find people who also belong to dimension X

http://community.tableausoftware.com/thread/114620

### Concatenating a field from multiple rows into one field using PREVIOUS_VALUE

Richard Leeke version:

http://community.tableausoftware.com/message/180164#180164

Alex Kerin version:

http://community.tableausoftware.com/thread/118259

find difference between dates, counting weekdays, counting work days

http://community.tableausoftware.com/thread/118000

http://community.tableausoftware.com/thread/104481

Also having a separate table that identifies working days/holidays and then joining to that

Dynamic anchor date with a relative date filter

http://voyrapido.tumblr.com/post/22763424744/creating-a-dynamic-anchor-date-with-a-relative-date

Stephen Few’s bandlines in Tableau

http://community.tableausoftware.com/message/198511

For surveys, see Chart Types.

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