CE 525 REGRESSION VIDEO Return Quiz Why regression

CE 525

REGRESSION VIDEO • Return Quiz • Why regression? • Re-watch video as it will be on the midterm! 1. This is the difference between actual observed values and predicted values. 2. This tool, new to Arc. GIS 10. 0, tries every possible combination for a set of Explanatory Variables to find the best fit for a model. 3. All of the tools discussed in the video are located in which toolbox in Arc. GIS? 4. The video referred to 6 checks to determine the validity of a given model. Name 2 of those checks. 5. These are the Variables we think contribute to the Dependent Variable.

SPATIAL ANALYSIS DATA • Get from website

SET YOUR PROJECTION • Before adding any data, set the Dataframe properties to GCS (NAD 1983) • After adding tornado data, Export them using the coordinate system of the Data Frame • Or try using the Define Projections tool

CLIP • Use the CLIP tool to create a new dataset from the Input Features containing only those features inside the Clip Features

MERGE • You can MERGE multiple datasets to create one new dataset • In order to use MERGE, the datasets must have identical attributes • FUN FACT: if there are selected features in the datasets to be MERGED, the new dataset will be made up of only those selected features

MERGE

CLASSIFICATION • METHODS OF CLASSIFICATION • • • Natural Breaks Quantile Equal Interval Manual Others

CLASSIFICATION • CLASSIFICATION OPTIONS • • • Number of Classes Break Values Sampling Size Manual Others

RASTER CALCULATOR • Use multiple Raster datasets added together to create a new Raster

WEIGHTED VARIABLES • Non-weighted variables create a dot with a value of ONE or Zero • Weighted Variables assign magnitude based on the chosen variable

CALCULATE GEOMETRY • Change Data Frame to State Plane coordinate system (NAD_1983_State. Plane_Indiana_West_FIPS_1302_Feet) • Add Field to Attribute Table • Double • Precision 10 • Scale 10 • Calculate Area in Square Miles • Why can’t this be done in GCS? • What can we do in GCS?

SPATIAL JOIN • Spatially Join Counties layer to Merged Tornadoes layer • Choose a summary (this will add a count) • This is a secondary function for this tool, but it’s handy

FIELD CALCULATOR • Add Field to Attribute Table • Double • Precision 10 • Scale 10 • Field Calculator • (Count of Tornadoes) / (Area)

SCRIPTING • Add Field to Attribute Table • Double • Precision 10 • Scale 10 • Use the following Piece-wise function: • Mobile homes < 1000: • TRI = 0. 4 x (1990 Pop. Density) + 0. 6 x (Tornados per Sq Mi) + 5 • 1000 < Mobile homes < 2000 • TRI = 0. 6 x (1990 Pop. Density) + 0. 4 x (Tornados per Sq Mi) + 5 • Mobile homes > 2000 • TRI = 0. 8 x (1990 Pop. Density) + 0. 2 x (Tornados per Sq Mi) + 5