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‎BIOSTATS_HW2.docx‎

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‎Epid602_HW1.docx‎

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‎HW3.docx.pdf‎

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‎Homework3.docx‎

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‎Lab 4 F17.docx.gdoc‎

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{"url": "https://docs.google.com/open?id=1EPoIDCCEo8Fd_A0oLeEwKw2hrjRdCUX5G_T-NWAMM0w", "doc_id": "1EPoIDCCEo8Fd_A0oLeEwKw2hrjRdCUX5G_T-NWAMM0w", "email": "[email protected]", "resource_id": "document:1EPoIDCCEo8Fd_A0oLeEwKw2hrjRdCUX5G_T-NWAMM0w"}

‎Lab 9-Debugging.gdoc‎

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{"url": "https://docs.google.com/open?id=1Taz8Ns-ZcgLkUurCxwsMfXXyLfS_zcZFEz2m50vkgYk", "doc_id": "1Taz8Ns-ZcgLkUurCxwsMfXXyLfS_zcZFEz2m50vkgYk", "email": "[email protected]", "resource_id": "document:1Taz8Ns-ZcgLkUurCxwsMfXXyLfS_zcZFEz2m50vkgYk"}

‎Lab0_getting started.sas‎

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/****************************************************************************************************************************/
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/********************************************** EPID642 Sampling and Power **************************************************/
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/************************************************** Lab 0: Getting started *************************************************/
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/***************************************************************************************************************************/
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libname lab0 'C:\Users\ning\Desktop\class materials\labs';
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*Reading in comma separated values;
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DATA nhanes;
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INFILE 'C:\Users\ning\Desktop\class materials\labs\lab0.csv' DLM=',';
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INPUT seqn gender ridageyr bmxbmi bmxwaist LBXGLU diabetes TSUGR;
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RUN;
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DATA lab0.nhanes;
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SET nhanes;
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RUN;
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*Question 2: mean(std) total sugar intake by diabetes;
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PROC MEANS DATA=lab0.nhanes;
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VAR tsugr;
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CLASS diabetes;
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RUN;
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*Question 3: diabetes status by gender;
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PROC FREQ DATA=lab0.nhanes;
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TABLES diabetes*gender;
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RUN;
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*Question 4: the proportion of the pre-obese and the obese;
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*Create obesity classification by BMI;
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DATA lab0.nhanes;
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SET lab0.nhanes;
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IF bmxbmi ne . and bmxbmi<25 THEN obesity=0;
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IF bmxbmi >=25 and bmxbmi<30 THEN obesity=1;
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IF bmxbmi >=30 THEN obesity=2;
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RUN;
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PROC FREQ DATA=lab0.nhanes;
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TABLES obesity;
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RUN;
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‎Lab1-reviewV2.sas‎

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/*------------------------------------------------------------------------------
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Filename: review.sas
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-------------------------------------------------------------------------------;
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*------------------------------------------------------------------------------;
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* Example 1 ;
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*------------------------------------------------------------------------------;
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/* Reading hand entered data into SAS */
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data DetroitWeight;
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input weight @@;
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/* The trailing at signs (@@) enable the procedure to read more than
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one observation per line. */
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datalines;
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157.7556 209.9111 136.5778 115.9111 136.8445 169.3333 168.8445 145.6667 199.8445
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168.8445 137.6 105.8444 169.0889 157 125.7556 181.9333 155.7333 130.0222
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268.8889 135.8222 157.4889 196.0667 147.6667 137.6
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147.6667 152.2 196.0667 154.4667 173.1333 140.1111
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140.1111 183.9556 189.7556 126.7556 103.0667 179.6667 163.8
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179.6667 163.8 107.8667 185.4667 113.9111 139.8667 168.5778
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201.8445 113.9111 305.4222 116.1778 170.3556 116.1778
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;
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run;
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/* Requesting univariate statistics and histogram for variable weight */
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proc univariate data=DetroitWeight plot;
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var weight;
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histogram;
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title "Histogram for weight (Continuous Variable)";
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run;
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/* One-sample t-test */
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proc ttest h0=175 alpha=0.05;
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var weight;
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title 'One-Sample t Test';
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run;
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*------------------------------------------------------------------------------;
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* Example 2 ;
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*------------------------------------------------------------------------------;
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/* Below step assumes that you have a copy of file "smoke.xls"
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in a directory called "M:\Biostats 522". This is specified in the line
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that begins with DATAFILE. I've also included a couple more examples showing
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how the DATAFILE line can be written if you had the data saved in either afs
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server or somewhere in your own C drive. So if you choose to work with
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another directory such as your flashdrive, change the "DATAFILE" line below
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to specify that entire path.
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Get help from your GSI if you don't know how to create a folder
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and save the files from canvas to that folder. */
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/* Note that the first set of commands (from PROC IMPORT to RUN) can also be
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done by choosing "File -> Import Data" from SAS's menu tabs.
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The SAS commands behind "File -> Import Data"
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are basically made of below set of "proc import" command
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details of which you do not really have to learn. */
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/* Import smoke.xls and save the data as smoke. */
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PROC IMPORT OUT= WORK.smoke
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/* datafile = "/afs/umich.edu/user/m/y/myrakim/class/bios522-W18/Datasets/smoke.xls" */
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datafile = "c:\class\0bios522-W18\Datasets\smoke.xls"
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/* datafile= "M:\Biostats 522\smoke.xlsx" */
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DBMS=EXCELCS REPLACE;
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RANGE="Sheet1$";
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SCANTEXT=YES;
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USEDATE=YES;
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SCANTIME=YES;
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RUN;
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/* List smoke Data:
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always list at least part of the data & check if they look good. */
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proc print; run;
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/* Univariate Descriptive Statistics of all variables in smoke data */
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proc means data=smoke;
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title "Descriptive Statistics";
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run;
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/* Create a Dichotomous Variable, then Save the Data as smoke2. */
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data smoke2; set smoke;
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if b<100 then lbw=1;
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else if b>=100 then lbw=0;
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run;
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/* Univariate Descriptive Statistics using dataset smoke2 */
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/* Note that "var A S B;" or "var lbw;" line is optional, and excluding this line */
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/* means you are requesting descriptive stats for all variables in the dataset. */
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/* If only "var lbw" is given, descriptive stats will be limited to lbw only. */
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proc means data=smoke2;
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title "Descriptive Statistics";
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title2 "A=age, S=smoke, B=Weight, lbw=low birth weight (1/0)";
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var A S B;
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var lbw;
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run;
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/* Requesting the contents of the dataset such as variable names */
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proc contents data=smoke2;
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title "Contents of SAS Data Set";
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run;
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/* Formating Statement: Effort to explain what the values of
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1 and 0 for lbw variable represent. The format is named lbwfmt. */
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proc format;
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value lbwfmt 1="1:Less than 100 oz" 0="0:>= 100 oz";
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run;
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/* Requesting Frequency Table for Variable lbw */
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proc freq data=smoke2;
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tables lbw;
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format lbw lbwfmt.;
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title "Frequencies for Categorical Variables";
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run;
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/* Requesting charts - simple visualization */
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proc chart data=smoke2;
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hbar lbw / discrete;
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title "Bar Charts for Categorical Variables";
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run;
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/* Requesting univariate statistics and histogram for variables A and S */
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proc univariate data=smoke2 plot;
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var A S;
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histogram;
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title "Histogram for Continuous Variables";
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run;
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*------------------------------------------------------------------------------;
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* Example 3 ;
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*------------------------------------------------------------------------------;
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/*
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* There are many ways to use menu drive ways of SAS - like SPSS.
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* For this course, I don't think these will be helpful. But they can
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* be useful when you cannot remember the SAS command for some simple analysis.
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*
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* Under Solutions tab, you will see ASSIST. Similarly under Solutions, you will
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* see Analysis, under which you will see Interactive Data Analysis.
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* ASSIST and Interactive Data Analysis provide ways to do menu driven SAS.
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* For each these, you will need to first load the SAS data by finding where the
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* dataset is located using Explorer within SAS.
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*
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* Another way to do this is by clicking either a SAS dataset or SAS program file.
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* For example, under Review module, you will see a dataset named "smoke.sas7bdat".
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* If you download this file to your working folder and double click the file,
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* you will have SAS Enterprise Guide open. Under SAS Enterprise Guide,
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* you will be able to do various analyses in menu-driven way by looking
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* under Tasks tab. You can similarly double click this file (review.sas)
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* which will open SAS Enterprise Guide.
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*/
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‎Lab1.docx.gdoc‎

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{"url": "https://docs.google.com/open?id=182GDq6D-jr2OwcyJWUeBh7UX0hPXS4LeQwbLuVsGpkU", "doc_id": "182GDq6D-jr2OwcyJWUeBh7UX0hPXS4LeQwbLuVsGpkU", "email": "[email protected]", "resource_id": "document:182GDq6D-jr2OwcyJWUeBh7UX0hPXS4LeQwbLuVsGpkU"}

‎Lab2-SLR.sas‎

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